Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail From: john larkin Newsgroups: sci.electronics.design Subject: Re: relay board Date: Wed, 26 Mar 2025 17:36:35 -0700 Organization: A noiseless patient Spider Lines: 54 Message-ID: <9s69ujdnu35op427mc88052eupl802jfhf@4ax.com> References: <67e174bc$0$19$882e4bbb@reader.netnews.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit Injection-Date: Thu, 27 Mar 2025 01:30:54 +0100 (CET) Injection-Info: dont-email.me; posting-host="b0737705929deb8d29973ed466648f30"; logging-data="3104655"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+5cVz/V9qMPSTlt3Z4crjG" User-Agent: ForteAgent/8.00.32.1272 Cancel-Lock: sha1:t7KhfHK27stEHwfyVNX8kb6sViA= Bytes: 3008 On Wed, 26 Mar 2025 23:24:52 -0000 (UTC), piglet wrote: >john larkin wrote: >> On Wed, 26 Mar 2025 17:13:57 +0100, Lasse Langwadt >> 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