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From: john larkin <jl@glen--canyon.com>
Newsgroups: sci.electronics.design
Subject: Re: relay board
Date: Wed, 26 Mar 2025 17:36:35 -0700
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On Wed, 26 Mar 2025 23:24:52 -0000 (UTC), piglet
<erichpwagner@hotmail.com> wrote:

>john larkin <jl@glen--canyon.com> wrote:
>> On Wed, 26 Mar 2025 17:13:57 +0100, Lasse Langwadt <llc@fonz.dk>
>> wrote:
>> 
>>> On 3/24/25 16:05, bitrex wrote:
>>>> On 3/24/2025 10:33 AM, john larkin wrote:
>>>>> 
>>>>> Here's another PCB:
>>>>> 
>>>>> https://www.dropbox.com/scl/fi/yxqdj418jx1ttuusqqehg/P946_Relays_A11.jpg?rlkey=hxshyt4mze59k31xpnsi3bfzc&raw=1
>>>>> 
>>>>> I figured we could have a relay board in our modular power system, and
>>>>> my PCB layout guy had time, so I did one.
>>>>> 
>>>>> Then I figured that instead of fuses to protect the contacts and PCB
>>>>> traces, I could use Hall sensors and drop out a relay if the current
>>>>> exceeds 8 amps. Then I figured I may as well report the currents to
>>>>> users. And why not voltage too? Then  it became a programmable circuit
>>>>> breaker module. With average and RMS voltage and current and power
>>>>> measurement and waveforms.  And programmable ganging. And plugin fuses
>>>>> for bussing. Somebody stop me.
>>>>> 
>>>> 
>>>> Better is the enemy of the good
>>> 
>>> 
>>> more like enemy of "good enough" aka. done
>> 
>> Done is an important engineering virue.
>> 
>> If a bit of hardware could be applied with some code, it may well be
>> worth putting on a board. Some customer might want a feature and it
>> could be added quickly.
>> 
>> Lots of people make electronic programmable circuit breakers, but
>> generally don't include measurements or waveform acquisition. So why
>> not? I have embarassing amounts of whitespace on this PCB.
>> 
>> 
>> 
>> 
>> 
>> 
>
>I can see how having a record of events prior to the “breaker” opening
>could be useful.

Good idea. We could act like a digital scope and save data before and
after the breaker open trigger. That's a feature. We'll do it.

Thanks