8 Channel Relay Switch Build Thread

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Moderator: Joe Malone

mrclunk
Posts: 8
Joined: Wed May 22, 2019 10:41 pm

Re: 8 Channel Relay Switch Build Thread

Post by mrclunk »

Sorry, i'm confused about the regulator too..

So i'm using 9 relay boards hence 74 x 12VDC relays.

I'll use a 24VDC PSU.
So does the 7812 regulator will drop the voltage for the whole circuit or just for the ULN2803??
According to the schematic it does but what you said early in this thread has confused me..

I could just use a 12VDC supply and bridge the reg pcb pins but possibly the circuit would behave better with local regulation?
Thanks
Paul

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Joe Malone
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Re: 8 Channel Relay Switch Build Thread

Post by Joe Malone »

mrclunk wrote:
Wed Jun 24, 2020 12:59 am
Sorry, i'm confused about the regulator too..

So i'm using 9 relay boards hence 74 x 12VDC relays.

I'll use a 24VDC PSU.
So does the 7812 regulator will drop the voltage for the whole circuit or just for the ULN2803??
According to the schematic it does but what you said early in this thread has confused me..

I could just use a 12VDC supply and bridge the reg pcb pins but possibly the circuit would behave better with local regulation?
Thanks
Paul
Is the 24v only for the relays? If so use either 24vdc relays or 12vdc power supply with 12vdc relays

Or is the power running something else? Or a spare power rail you already have?

The reg is more for if you have a existing higher voltage rail and want to run lower voltage relays. But if power rail is only for the relays best to run the same volts as the relays to make it simple.
Joe :-)
JLM Audio
Capturing Audio without Injury

mrclunk
Posts: 8
Joined: Wed May 22, 2019 10:41 pm

Re: 8 Channel Relay Switch Build Thread

Post by mrclunk »

Thanks Joe,
successfully installed my box in studio yesterday.
After a few balanced to unbalanced wiring cock ups it works a treat!
I'd read the IDC connector pin out as 1 = Shield 2 =Hot 3 =Cold 3 etc.. But it's 1 = Shield 2=COLD 3=hot so the unbalanced console SND and RTNs didn't work..

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Joe Malone
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Posts: 1635
Joined: Wed Jan 24, 2007 11:35 pm
Location: Brisbane, Australia
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Re: 8 Channel Relay Switch Build Thread

Post by Joe Malone »

mrclunk wrote:
Tue Jul 07, 2020 12:08 am
Thanks Joe,
successfully installed my box in studio yesterday.
After a few balanced to unbalanced wiring cock ups it works a treat!
I'd read the IDC connector pin out as 1 = Shield 2 =Hot 3 =Cold 3 etc.. But it's 1 = Shield 2=COLD 3=hot so the unbalanced console SND and RTNs didn't work..
Cool great to hear you got it all working. Be great to see a photo or two on here or facebook of the final build :-)
Joe :-)
JLM Audio
Capturing Audio without Injury

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