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TOPIC: External control wiring

External control wiring 03 Jan 2020 13:15 #1

  • n1mjf
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Hello all.

I will be wiring up an external preamp to be triggered from my SunSDR2 DX's external control. I see that a diode is required when using the external control to engage a relay directly.

If I'm using an opto-isolated relay like the one in the example below, should I still put a diode? I will not be connecting the VCC to the Power SDR's +12v line. I plan to only connect the "data in" and ground to the PowerSDR.

www.amazon.com/gp/product/B07QGSFPTZ
Current set up: SunSDR2 DX, HiFi audio, Alpha Delta DX-CC up 20 feet.
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External control wiring 03 Jan 2020 18:23 #2

  • EI9HEB
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As you can see the relay has three terminals market DC + for positive supply, DC - for negative (GND) and IN terminal for the trigger so, you do not need the diode.
The diode is required for the inductive load. If you control the relay directly from the SUNSDR the diode would be mandatory.
How do you VooDoo?
Last Edit: 03 Jan 2020 18:26 by EI9HEB.
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External control wiring 04 Jan 2020 11:59 #3

  • n1mjf
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Thank you Sir! I assumed this was the case but wanted to be sure before trying it. These relays really seemed like a good choice for the purpose.
EI9HEB wrote:
As you can see the relay has three terminals market DC + for positive supply, DC - for negative (GND) and IN terminal for the trigger so, you do not need the diode.
The diode is required for the inductive load. If you control the relay directly from the SUNSDR the diode would be mandatory.
Current set up: SunSDR2 DX, HiFi audio, Alpha Delta DX-CC up 20 feet.
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