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finn.lassen(at)verizon.ne
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 Posted: Sun Jun 04, 2023 3:45 pm Post subject: OVP (over-voltage protection) circuit changes |
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I've successfully been using this in my RV-3B and now RV-4.
[img]cid:part1.8E846F4C.FF4D6963(at)verizon.net[/img]
However recently alternator field breaker has started popping more and more frequently. After swapping alternator and breaker and using a heatgun on the OVP I've determined that the OVP triggers when getting hot.
So I figured I'd just build a new one. However the MSB4991 is obsolete and no longer available from Mouser and DigiKey.
Is that the reason for this newer OVP circuit?
[img]cid:part2.1B5146CC.00414CEF(at)verizon.net[/img]
Much higher parts count.
I really like the original simple compact circuit.
[img]cid:part3.578EFC4D.3928B994(at)verizon.net[/img]
I had it mounted on top of the engine close to the alternator. Maybe I should just move it into the cockpit?
Finn
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user9253
Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan
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| Posted: Sun Jun 04, 2023 6:41 pm Post subject: Re: OVP (over-voltage protection) circuit changes |
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eBay has the parts you need.
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