8 Channel Relay Switch Build Thread
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Re: 8 Channel Relay Switch Build Thread
Thanks for all the information in this thread Joe, it's helped me figure out most things. I'm still confused on the regulator though - If I'm using a 24v supply and 24v relays is there a need to use the regulator?
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Re: 8 Channel Relay Switch Build Thread
No the reg is just if you need to run relays that are lower voltages then the power rail. This is more for when the power rail is shared across several of our pcbs for different things.mickdundee63 wrote: ↑Thu Aug 25, 2022 12:06 amThanks for all the information in this thread Joe, it's helped me figure out most things. I'm still confused on the regulator though - If I'm using a 24v supply and 24v relays is there a need to use the regulator?
Joe
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Re: 8 Channel Relay Switch Build Thread
Ok great, thanks for such a quick reply Joe. So I can just bridge pins 1 - 4 and 13 - 16, then take the 24v from any of pins 13 - 16 to run via spst to whichever channels I want to switch?Joe Malone wrote: ↑Thu Aug 25, 2022 8:36 amNo the reg is just if you need to run relays that are lower voltages then the power rail. This is more for when the power rail is shared across several of our pcbs for different things.mickdundee63 wrote: ↑Thu Aug 25, 2022 12:06 amThanks for all the information in this thread Joe, it's helped me figure out most things. I'm still confused on the regulator though - If I'm using a 24v supply and 24v relays is there a need to use the regulator?
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Re: 8 Channel Relay Switch Build Thread
If you put 24v direct into the ULN2803 inputs which are basically 2k7 impedance. Each input will draw about 9mA heating up the ULN lots. So best to use series resistor like 20k or 10k to each input so current per input is only 1 or 2mA.mickdundee63 wrote: ↑Thu Aug 25, 2022 10:58 amOk great, thanks for such a quick reply Joe. So I can just bridge pins 1 - 4 and 13 - 16, then take the 24v from any of pins 13 - 16 to run via spst to whichever channels I want to switch?Joe Malone wrote: ↑Thu Aug 25, 2022 8:36 amNo the reg is just if you need to run relays that are lower voltages then the power rail. This is more for when the power rail is shared across several of our pcbs for different things.mickdundee63 wrote: ↑Thu Aug 25, 2022 12:06 amThanks for all the information in this thread Joe, it's helped me figure out most things. I'm still confused on the regulator though - If I'm using a 24v supply and 24v relays is there a need to use the regulator?
Joe
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Re: 8 Channel Relay Switch Build Thread
Got it! Thank you
Got it! Thank youJoe Malone wrote: ↑Thu Aug 25, 2022 1:07 pmIf you put 24v direct into the ULN2803 inputs which are basically 2k7 impedance. Each input will draw about 9mA heating up the ULN lots. So best to use series resistor like 20k or 10k to each input so current per input is only 1 or 2mA.mickdundee63 wrote: ↑Thu Aug 25, 2022 10:58 amOk great, thanks for such a quick reply Joe. So I can just bridge pins 1 - 4 and 13 - 16, then take the 24v from any of pins 13 - 16 to run via spst to whichever channels I want to switch?Joe Malone wrote: ↑Thu Aug 25, 2022 8:36 amNo the reg is just if you need to run relays that are lower voltages then the power rail. This is more for when the power rail is shared across several of our pcbs for different things.
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Re: 8 Channel Relay Switch Build Thread
Hi Joe,
I was wondering if you might be up for designing a companion board that had the logic to make this into a 4:1 stereo balanced source selector? Using momentary action pushbutton switches and including the LED drivers. I think others might find that useful as well.
Thanks,
Paul
I was wondering if you might be up for designing a companion board that had the logic to make this into a 4:1 stereo balanced source selector? Using momentary action pushbutton switches and including the LED drivers. I think others might find that useful as well.
Thanks,
Paul
Paul Gold
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Interesting as I am working on a digital control relay volume using an Arduino nano etc for control so users can customise it so would be fairly easy to do in and out switching control from the same CPU. I will have a look at it.
Also have attached a new relay pcb which is perfect for switching 4 x 2 input or outputs and uses our simple STBUS 10 pin connection. You can ribbon cable directly across the 4 10 pin header to make 4 to 1 or 1 to 4 switching.
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Re: 8 Channel Relay Switch Build Thread
HI PaulGold wrote: ↑Mon Nov 27, 2023 5:47 amHi Joe,
I was wondering if you might be up for designing a companion board that had the logic to make this into a 4:1 stereo balanced source selector? Using momentary action pushbutton switches and including the LED drivers. I think others might find that useful as well.
Thanks,
Paul
Interesting as I am working on a digital control relay volume using an Arduino nano etc for control so users can customise it so would be fairly easy to do in and out switching control from the same CPU. I will have a look at it.
Also have attached a new relay pcb which is perfect for switching 4 x 2 input or outputs and uses our simple STBUS 10 pin connection. You can ribbon cable directly across the 4 10 pin header to make 4 to 1 or 1 to 4 switching.
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Joe
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