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Re: Keying interface

 

It looks like my drawing will work. I used a 2N2222 to switch it. This is done on a perf board only. The amp
keying is 25 volts?@ 60 mA so I'll have to determine the 2N2222 base resistor. I'm measuring just under 7mA
on the diode side which is what the radio will see. I would like it down to 5 or 6mA.?

To get the voltage and current down on the diode side I made a voltage divider?which brings the voltage down to
around 6 1/2, which is where I'm measuring?the diode current at just under 7mA.?

Still working at it.

Bob W4JFA

On Sun, Jan 12, 2025 at 4:27?PM Bob via <W4JFABob=[email protected]> wrote:
Ron, Thank you. I'm trying to learn these optocouplers?so I need to figure out on my own.
Attached is my drawing. After looking around I may order? a few 4N25's.
Bob W4JFA

On Sun, Jan 12, 2025 at 10:24?AM Ron via <rolexa=[email protected]> wrote:
Another simple almost complete interface costing a few $$:? An Arduino 12V relay module.? It has an optoisolator input driving a reed relay.? 12V power, and a couple cables are all that's needed to make the interface.? I've used it to connect my Ten Tec Jupiter to my Heathkit HL2200 linear.??
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