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bobnoffs
Joined: 04 Jul 2012
Posts: 132
Location: northern wi.
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 Posted: Wed Jan 13, 2021 7:09 am Post subject: low voltage warning |
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a few months i posted about a low voltage warning that would trip at 13.4 volts especially for earthx batteries. i set up a circuit board for a low voltage trip and another voltage regulator board to supply a constant 12 volts to the low voltage board. a lot of wires [reg. voltage, sense voltage, power to led warn light, ground]. i did get it all working as it was supposed to. 10 square inches of circuit board.
i went back to the perihelion web site and they supply them now for $50. i called the owner and he said he could build them set to any alarm voltage and would i like steady or flashing light? how could i resist?
the store bought device trips at the same voltage every time, no ''stuttering'' of the light. when it goes on it's on. raising the voltage .5 volts will shut it off.
i see a very popular vender sells a like item for $185.
this whole thing slips thru the hole in the panel for the led and is about 2'' deep. you connect a pos. and a neg.
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Ceengland
Joined: 11 Oct 2020
Posts: 379
Location: MS
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| Posted: Wed Jan 13, 2021 8:29 am Post subject: low voltage warning |
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On 1/13/2021 9:09 AM, bobnoffs wrote:
| Quote: |
a few months i posted about a low voltage warning that would trip at 13.4 volts especially for earthx batteries. i set up a circuit board for a low voltage trip and another voltage regulator board to supply a constant 12 volts to the low voltage board. a lot of wires [reg. voltage, sense voltage, power to led warn light, ground]. i did get it all working as it was supposed to. 10 square inches of circuit board.
i went back to the perihelion web site and they supply them now for $50. i called the owner and he said he could build them set to any alarm voltage and would i like steady or flashing light? how could i resist?
the store bought device trips at the same voltage every time, no 'stuttering' of the light. when it goes on it's on. raising the voltage .5 volts will shut it off.
i see a very popular vender sells a like item for $185.
this whole thing slips thru the hole in the panel for the led and is about 2' deep. you connect a pos. and a neg.
Hi Bob,
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Here you go:
https://www.tomtop.com/p-e1021.html
Charlie
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bobnoffs
Joined: 04 Jul 2012
Posts: 132
Location: northern wi.
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| Posted: Wed Jan 13, 2021 10:35 am Post subject: Re: low voltage warning |
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hey charlie,
that is the board i started with. when you get it it doesn't match the picture. has 4 buttons, not 3 for starters. when i asked for some kind of instructions for the board i got they ended up sending a refund.i did get the board figured out.
then someone posted their board, similar to the one you posted, was erratic if the board was powered by more than 13 volts. so i added a voltage reg. board.
it was all interesting and i don't regret any of it but i ended up with 10 sq inches of circuit board. layered in plexi. it is an inch thick. i had confidence in it but it just couldn't compete spacewise.
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Ceengland
Joined: 11 Oct 2020
Posts: 379
Location: MS
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| Posted: Wed Jan 13, 2021 11:10 am Post subject: low voltage warning |
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On 1/13/2021 12:35 PM, bobnoffs wrote:
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hey charlie,
that is the board i started with. when you get it it doesn't match the picture. has 4 buttons, not 3 for starters. when i asked for some kind of instructions for the board i got they ended up sending a refund.i did get the board figured out.
then someone posted their board, similar to the one you posted, was erratic if the board was powered by more than 13 volts. so i added a voltage reg. board.
it was all interesting and i don't regret any of it but i ended up with 10 sq inches of circuit board. layered in plexi. it is an inch thick. i had confidence in it but it just couldn't compete spacewise.
Sorry it didn't work out. I've got a couple in my parts stock, on the
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advice of a friend who's near genius level with most things aircraft,
but I've never even powered them up. Odd that someone would have an
issue if powered with more than 13 V; the guy who gave me the tip uses
his as an overvoltage protection device on his RV8.
Charlie
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bobnoffs
Joined: 04 Jul 2012
Posts: 132
Location: northern wi.
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| Posted: Wed Jan 13, 2021 6:39 pm Post subject: Re: low voltage warning |
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like i said it was a good learning experience. if i had left out the reg. i probably would have gone with the setup.
winter is setting in up here and there is not much else to do. seriously , a couple days ago i pulled my snowblower into the shop and replaced all the belts before one broke in the next foot of snow. not like me at all!
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