Matronics Email Lists Forum Index Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
 
 Get Email Distribution Too!Get Email Distribution Too!    FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Poor Man's Battery Tester
Goto page 1, 2  Next
 
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> AeroElectric-List
View previous topic :: View next topic  
Author Message
revenson3(at)gmail.com
Guest





PostPosted: Fri Jan 29, 2021 8:20 pm    Post subject: Poor Man's Battery Tester Reply with quote

I built Bob's "Poor Man's Battery Capacity Tester".
 
Somehow I got the impression the relay would 'drop' out and thus turn off the lamp and clock when the battery reached about 10V.   But after re-reading "Battery Replacement: A Plan for Throwing in the Towel", that expectation is not written there.   My experience has been that it turns off when the battery reaches about 4V.
 
Odyssey Load Test Procedure and Reconditioning Procedures recommend ending the test at 10V.   I've done this, but it requires my presence when the battery nears 10V.
Is there a way to modify this circuit so that it will 'turn off' when the battery reaches 10V?
Or, is there a commercially available tester that would load a battery at 4 amps and record the time required until the battery reaches 10V?

Roger.


- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List
Back to top
user9253



Joined: 28 Mar 2008
Posts: 1906
Location: Riley TWP Michigan

PostPosted: Sat Jan 30, 2021 5:17 am    Post subject: Re: Poor Man's Battery Tester Reply with quote

Bob's Poor Man's Battery Tester http://www.aeroelectric.com/articles/battest.pdf
is supposed to shut off automatically at 10 volts. Did you change any parts values?
Did you use a 10 volt zener?


- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

_________________
Joe Gores
Back to top
View user's profile Send private message
user9253



Joined: 28 Mar 2008
Posts: 1906
Location: Riley TWP Michigan

PostPosted: Sat Jan 30, 2021 5:38 am    Post subject: Re: Poor Man's Battery Tester Reply with quote

Trouble shooting the battery tester:
Is the zener diode installed backwards?
If one end of the zener diode is disconnected, does the relay drop out?
If not, has the correct transistor been used?
Has the transistor been connected correctly?


- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

_________________
Joe Gores
Back to top
View user's profile Send private message
Eric Page



Joined: 15 Feb 2017
Posts: 241

PostPosted: Sat Jan 30, 2021 8:38 am    Post subject: Re: Poor Man's Battery Tester Reply with quote

It sounds like your circuit may be shutting off at the natural dropout voltage of the relay, which suggests that full battery voltage is reaching the relay's coil.

In addition to Joe's suggestions, check that the Zener diode is actually a 10V device, and not something near 3V, and that it hasn't failed (diodes can fail short circuit).


- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List
Back to top
View user's profile Send private message
revenson3(at)gmail.com
Guest





PostPosted: Sat Jan 30, 2021 5:12 pm    Post subject: Poor Man's Battery Tester Reply with quote

Bought new resistors and 10V zener. Rewired carefully on a test board. This time it kicked off, but at a higher voltage than I wanted (12V).

The zener was a NTE5019A, 10.0V +/-5%, 1/2 watt. Isn't that more like +/-20%? Cost all of $0.79.
I'll go back Monday, see if I can get a +/-1% zener, and ask about a higher quality brand.
Thanks for your comments. One more question...does the wattage make a difference in this circuit?
Roger. 
On Fri, Jan 29, 2021, 9:23 PM Roger Evenson <revenson3(at)gmail.com (revenson3(at)gmail.com)> wrote:

Quote:
I built Bob's "Poor Man's Battery Capacity Tester".
 
Somehow I got the impression the relay would 'drop' out and thus turn off the lamp and clock when the battery reached about 10V.   But after re-reading "Battery Replacement: A Plan for Throwing in the Towel", that expectation is not written there.   My experience has been that it turns off when the battery reaches about 4V.
 
Odyssey Load Test Procedure and Reconditioning Procedures recommend ending the test at 10V.   I've done this, but it requires my presence when the battery nears 10V.
Is there a way to modify this circuit so that it will 'turn off' when the battery reaches 10V?
Or, is there a commercially available tester that would load a battery at 4 amps and record the time required until the battery reaches 10V?

Roger.




- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List
Back to top
user9253



Joined: 28 Mar 2008
Posts: 1906
Location: Riley TWP Michigan

PostPosted: Sat Jan 30, 2021 5:33 pm    Post subject: Re: Poor Man's Battery Tester Reply with quote

The problem is not the tolerance of the zener.
The resistors affect the dropout voltage too.
Try a 9 volt zener. They are cheap. Buy a few different values to experiment with.
Wattage does not affect the circuit very much. 1/2 watt is good.


- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

_________________
Joe Gores
Back to top
View user's profile Send private message
charlesdavis(at)iuncapped
Guest





PostPosted: Sat Jan 30, 2021 9:02 pm    Post subject: Poor Man's Battery Tester Reply with quote

You may have better luck getting 2x5v 1% zeners than a 10v 1% - just
wire them in series

Charles
On 31/01/21 03:10 am, Roger Evenson wrote:
Quote:
Bought new resistors and 10V zener. Rewired carefully on a test board.
This time it kicked off, but at a higher voltage than I wanted (12V).

The zener was a NTE5019A, 10.0V +/-5%, 1/2 watt. Isn't that more like
+/-20%? Cost all of $0.79.

I'll go back Monday, see if I can get a +/-1% zener, and ask about a
higher quality brand.

Thanks for your comments. One more question...does the wattage make a
difference in this circuit?
Roger.



- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List
Back to top
nuckolls.bob(at)aeroelect
Guest





PostPosted: Sun Jan 31, 2021 8:10 pm    Post subject: Poor Man's Battery Tester Reply with quote

At 10:24 AM 1/31/2021, you wrote:
Quote:
--> AeroElectric-List message posted by: Dick Tasker <dick(at)thetaskerfamily.com>

Unfortunately they don't make 5V zeners - only 4.7V or 5.1V.

The turnoff voltage is also affected by the actual dropout current of the relay as well. The less current it takes to hold in the relay, the lower the voltage it drops out at. And conversely, the higher the current it takes to hold the relay on, the higher the voltage it drops out at.

My apologies guys . . . I intended to update that
article years ago for just problems you're wrestling
with. I sat down today and finished an update that I
started some time ago.

https://tinyurl.com/y44wl64t

The 'sloppy' zener is replaced with a precision
adjustable zener. The test set's trip point is
calibrated by one of two methods. Use precision,
1% resistors to bias up the reference port of the
zener -OR- you can use 5% resistors and a potentiometer
to fabricate an adjustable trip point feature.

Either technique yields a predictable and stable
set point for disconnecting the test load. Again,
please forgive my tardiness.

I'll also remind readers of a sophisticated
battery test option in the form of West Mountain
Radio's CBA series, computer driven battery
testers.

https://tinyurl.com/mas7ea9

The one I have right now is probably the 4th
in a series that I've owned over the last 20
years, give or take. They are versatile and
accurate.

But for most of our brother's need to peek
into Conditions for Continued Airworthiness,
the Po' Man's battery-runner-downer is of
excellent value.


Bob . . .

Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"


- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List
Back to top
jluckey(at)pacbell.net
Guest





PostPosted: Sun Jan 31, 2021 10:18 pm    Post subject: Poor Man's Battery Tester Reply with quote

Bob,
Is that the correct symbol for the 1N4001? Is it a zener?


-Jeff

On Sunday, January 31, 2021, 08:24:34 PM PST, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com> wrote:




At 10:24 AM 1/31/2021, you wrote:
Quote:
--> AeroElectric-List message posted by: Dick Tasker <dick(at)thetaskerfamily.com>

Unfortunately they don't make 5V zeners - only 4.7V or 5.1V.

The turnoff voltage is also affected by the actual dropout current of the relay as well. The less current it takes to hold in the relay, the lower the voltage it drops out at. And conversely, the higher the current it takes to hold the relay on, the higher the voltage it drops out at.

My apologies guys . . . I intended to update that
article years ago for just problems you're wrestling
with. I sat down today and finished an update that I
started some time ago.

https://tinyurl.com/y44wl64t

The 'sloppy' zener is replaced with a precision
adjustable zener. The test set's trip point is
calibrated by one of two methods. Use precision,
1% resistors to bias up the reference port of the
zener -OR- you can use 5% resistors and a potentiometer
to fabricate an adjustable trip point feature.

Either technique yields a predictable and stable
set point for disconnecting the test load. Again,
please forgive my tardiness.

I'll also remind readers of a sophisticated
battery test option in the form of West Mountain
Radio's CBA series, computer driven battery
testers.

https://tinyurl.com/mas7ea9

The one I have right now is probably the 4th
in a series that I've owned over the last 20
years, give or take. They are versatile and
accurate.

But for most of our brother's need to peek
into Conditions for Continued Airworthiness,
the Po' Man's battery-runner-downer is of
excellent value.


Bob . . .

Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"


- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List
Back to top
jluckey(at)pacbell.net
Guest





PostPosted: Sun Jan 31, 2021 10:28 pm    Post subject: Poor Man's Battery Tester Reply with quote

and do you need the second 470 ohm resistor between the transistor base & the LM431?


-Jeff

On Sunday, January 31, 2021, 10:18:10 PM PST, Jeff Luckey <jluckey(at)pacbell.net> wrote:





Bob,

Is that the correct symbol for the 1N4001? Is it a zener?
-Jeff


On Sunday, January 31, 2021, 08:24:34 PM PST, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com> wrote:


At 10:24 AM 1/31/2021, you wrote:
Quote:
--> AeroElectric-List message posted by: Dick Tasker <dick(at)thetaskerfamily.com> Unfortunately they don't make 5V zeners - only 4.7V or 5.1V. The turnoff voltage is also affected by the actual dropout current of the relay as well. The less current it takes to hold in the relay, the lower the voltage it drops out at. And conversely, the higher the current it takes to hold the relay on, the higher the voltage it drops out at.
My apologies guys . . . I intended to update that article years ago for just problems you're wrestling with. I sat down today and finished an update that I started some time ago. https://tinyurl.com/y44wl64t The 'sloppy' zener is replaced with a precision adjustable zener. The test set's trip point is calibrated by one of two methods. Use precision, 1% resistors to bias up the reference port of the zener -OR- you can use 5% resistors and a potentiometer to fabricate an adjustable trip point feature. Either technique yields a predictable and stable set point for disconnecting the test load. Again, please forgive my tardiness. I'll also remind readers of a sophisticated battery test option in the form of West Mountain Radio's CBA series, computer driven battery testers. https://tinyurl.com/mas7ea9 The one I have right now is probably the 4th in a series that I've owned over the last 20 years, give or take. They are versatile and accurate. But for most of our brother's need to peek into Conditions for Continued Airworthiness, the Po' Man's battery-runner-downer is of excellent value.
Bob . . . Un impeachable logic: George Carlin asked, "If black boxes survive crashes, why don't they make the whole airplane out of that stuff?"


- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List
Back to top
yellowduckduo(at)gmail.co
Guest





PostPosted: Mon Feb 01, 2021 3:26 am    Post subject: Poor Man's Battery Tester Reply with quote

I just use a 12 volt automotive inverter to drive 120 volt lamps as a
load.  The cigarette lighter inverters that I have automatically shut
down right around 10 volts input.  Close enough for me.
Ken

On 31/01/2021 11:09 PM, Robert L. Nuckolls, III wrote:
Quote:
At 10:24 AM 1/31/2021, you wrote:
>
> <dick(at)thetaskerfamily.com>
>
> Unfortunately they don't make 5V zeners - only 4.7V or 5.1V.
>
> The turnoff voltage is also affected by the actual dropout current of
> the relay as well.  The less current it takes to hold in the relay,
> the lower the voltage it drops out at.  And conversely, the higher
> the current it takes to hold the relay on, the higher the voltage it
> drops out at.

  My apologies guys . . . I intended to update that
  article years ago for just problems you're wrestling
  with. I sat down today and finished an update that I
  started some time ago.

https://tinyurl.com/y44wl64t <https://tinyurl.com/y44wl64t>

  The 'sloppy' zener is replaced with a precision
  adjustable zener. The test set's trip point is
  calibrated by one of two methods. Use precision,
  1% resistors to bias up the reference port of the
  zener -OR- you can use 5% resistors and a potentiometer
  to fabricate an adjustable trip point feature.

  Either technique yields a predictable and stable
  set point for disconnecting the test load. Again,
  please forgive my tardiness.

  I'll also remind readers of a sophisticated
  battery test option in the form of West Mountain
  Radio's CBA series, computer driven battery
  testers.

https://tinyurl.com/mas7ea9 <https://tinyurl.com/mas7ea9>

  The one I have right now is probably the 4th
  in a series that I've owned over the last 20
  years, give or take. They are versatile and
  accurate.

  But for most of our brother's need to peek
  into Conditions for Continued Airworthiness,
  the Po' Man's battery-runner-downer is of
  excellent value.

  Bob . . .

  Un impeachable logic: George Carlin asked, "If black boxes
  survive crashes, why don't they make the whole airplane
  out of that stuff?"



- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List
Back to top
user9253



Joined: 28 Mar 2008
Posts: 1906
Location: Riley TWP Michigan

PostPosted: Mon Feb 01, 2021 6:00 am    Post subject: Re: Poor Man's Battery Tester Reply with quote

Bob, clocks that run off from 120 VAC are rare.
I suggest that the AC clock be replaced by a 1.5 volt battery operated clock.
Some experimenters might prefer to power a Mini Quartz Clock Movement
by the 12 volt battery that is being tested (with voltage reduced to 1.5)
The clock and relay and circuit board could all be contained in one enclosure.


- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

_________________
Joe Gores
Back to top
View user's profile Send private message
rd2(at)dejazzd.com
Guest





PostPosted: Mon Feb 01, 2021 6:30 am    Post subject: Poor Man's Battery Tester Reply with quote

How about a (readily available) AC hour meter? Admittedly, it could give up to 1/10 (6 min) less reading.
Rumen

---


- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List
Back to top
n233ee(at)gmail.com
Guest





PostPosted: Mon Feb 01, 2021 6:50 am    Post subject: Poor Man's Battery Tester Reply with quote

I wonder if something like this would be useful?
https://www.mpja.com/02-01-21.asp?r=326752&s=39

Quote:
On Jan 31, 2021, at 10:20 PM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com> wrote:

 At 10:24 AM 1/31/2021, you wrote:
Quote:
--> AeroElectric-List message posted by: Dick Tasker <dick(at)thetaskerfamily.com>

Unfortunately they don't make 5V zeners - only 4.7V or 5.1V.

The turnoff voltage is also affected by the actual dropout current of the relay as well. The less current it takes to hold in the relay, the lower the voltage it drops out at. And conversely, the higher the current it takes to hold the relay on, the higher the voltage it drops out at.

My apologies guys . . . I intended to update that
article years ago for just problems you're wrestling
with. I sat down today and finished an update that I
started some time ago.

https://tinyurl.com/y44wl64t

The 'sloppy' zener is replaced with a precision
adjustable zener. The test set's trip point is
calibrated by one of two methods. Use precision,
1% resistors to bias up the reference port of the
zener -OR- you can use 5% resistors and a potentiometer
to fabricate an adjustable trip point feature.

Either technique yields a predictable and stable
set point for disconnecting the test load. Again,
please forgive my tardiness.

I'll also remind readers of a sophisticated
battery test option in the form of West Mountain
Radio's CBA series, computer driven battery
testers.

https://tinyurl.com/mas7ea9

The one I have right now is probably the 4th
in a series that I've owned over the last 20
years, give or take. They are versatile and
accurate.

But for most of our brother's need to peek
into Conditions for Continued Airworthiness,
the Po' Man's battery-runner-downer is of
excellent value.


Bob . . .

Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"



- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List
Back to top
charlesdavis(at)iuncapped
Guest





PostPosted: Mon Feb 01, 2021 6:56 am    Post subject: Poor Man's Battery Tester Reply with quote

Bob
Is it right that the clock only runs when the battery is charging ?
Charles

On 01/02/21 08:18 am, Jeff Luckey wrote:

Quote:
Bob,


Is that the correct symbol for the 1N4001?  Is it a zener?




-Jeff



On Sunday, January 31, 2021, 08:24:34 PM PST, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com> (nuckolls.bob(at)aeroelectric.com) wrote:




At 10:24 AM 1/31/2021, you wrote:
Quote:
--> AeroElectric-List message posted by: Dick Tasker <dick(at)thetaskerfamily.com> (dick(at)thetaskerfamily.com)

Unfortunately they don't make 5V zeners - only 4.7V or 5.1V.

The turnoff voltage is also affected by the actual dropout current of the relay as well.  The less current it takes to hold in the relay, the lower the voltage it drops out at.  And conversely, the higher the current it takes to hold the relay on, the higher the voltage it drops out at.

  My apologies guys . . . I intended to update that
  article years ago for just problems you're wrestling
  with. I sat down today and finished an update that I
  started some time ago.

https://tinyurl.com/y44wl64t

  The 'sloppy' zener is replaced with a precision
  adjustable zener. The test set's trip point is
  calibrated by one of two methods. Use precision,
  1% resistors to bias up the reference port of the
  zener -OR- you can use 5% resistors and a potentiometer
  to fabricate an adjustable trip point feature.

  Either technique yields a predictable and stable
  set point for disconnecting the test load. Again,
  please forgive my tardiness.

  I'll also remind readers of a sophisticated
  battery test option in the form of West Mountain
  Radio's CBA series, computer driven battery
  testers.

https://tinyurl.com/mas7ea9

  The one I have right now is probably the 4th
  in a series that I've owned over the last 20
  years, give or take. They are versatile and
  accurate.

  But for most of our brother's need to peek
  into Conditions for Continued Airworthiness,
  the Po' Man's battery-runner-downer is of
  excellent value.


  Bob . . .

  Un impeachable logic: George Carlin asked, "If black boxes
  survive crashes, why don't they make the whole airplane
  out of that stuff?"







- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List
Back to top
rnjcurtis(at)charter.net
Guest





PostPosted: Mon Feb 01, 2021 7:04 am    Post subject: Poor Man's Battery Tester Reply with quote

Joe,

A mere 50 years, we all had one of these clocks on our bedside night stand. Walmart still sells them.

Roger

From: user9253 (fransew(at)gmail.com)
Sent: Monday, February 1, 2021 9:05 AM
To: aeroelectric-list(at)matronics.com (aeroelectric-list(at)matronics.com)
Subject: Re: Poor Man's Battery Tester


--> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com>

Bob, clocks that run off from 120 VAC are rare.
I suggest that the AC clock be replaced by a 1.5 volt battery operated clock.
Some experimenters might prefer to power a Mini Quartz Clock Movement
by the 12 volt battery that is being tested (with voltage reduced to 1.5)
The clock and relay and circuit board could all be contained in one enclosure.

--------
Joe Gores




Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=500490#500490



 

<= Use the Matronics List Features Navigator to browse


- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List
Back to top
nuckolls.bob(at)aeroelect
Guest





PostPosted: Mon Feb 01, 2021 7:33 am    Post subject: Poor Man's Battery Tester Reply with quote

At 08:55 AM 2/1/2021, you wrote:

Quote:
Bob

Is it right that the clock only runs when the battery is charging ?

discharging


Bob . . .

Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"


- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List
Back to top
nuckolls.bob(at)aeroelect
Guest





PostPosted: Mon Feb 01, 2021 7:34 am    Post subject: Poor Man's Battery Tester Reply with quote

At 08:49 AM 2/1/2021, you wrote:
Quote:
I wonder if something like this would be useful?

https://www.mpja.com/02-01-21.asp?r=326752&s=39

Absolutely. Good eye!



Bob . . .

Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"


- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List
Back to top
nuckolls.bob(at)aeroelect
Guest





PostPosted: Mon Feb 01, 2021 7:35 am    Post subject: Poor Man's Battery Tester Reply with quote

At 08:29 AM 2/1/2021, you wrote:
Quote:
--> AeroElectric-List message posted by: rd2 <rd2(at)dejazzd.com>

How about a (readily available) AC hour meter? Admittedly, it could give up to 1/10 (6 min) less reading.
Rumen

Sure . . . unless the meter is resetable to zero,
you would have to calculate the discharge time
but yes, as a timekeeping device it would be
a good candidate.



Bob . . .

Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"


- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List
Back to top
nuckolls.bob(at)aeroelect
Guest





PostPosted: Mon Feb 01, 2021 7:36 am    Post subject: Poor Man's Battery Tester Reply with quote

At 08:01 AM 2/1/2021, you wrote:
Quote:
--> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com>

Bob, clocks that run off from 120 VAC are rare.
I suggest that the AC clock be replaced by a 1.5 volt battery operated clock.
Some experimenters might prefer to power a Mini Quartz Clock Movement
by the 12 volt battery that is being tested (with voltage reduced to 1.5)
The clock and relay and circuit board could all be contained in one enclosure.

How do you start/stop the thing without it
going brain dead?



Bob . . .

Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"


- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List
Back to top
Display posts from previous:   
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> AeroElectric-List All times are GMT - 8 Hours
Goto page 1, 2  Next
Page 1 of 2

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Powered by phpBB © 2001, 2005 phpBB Group