Yes! I simulated that chip in ltspice, and the highest value of the resistor to make a relay work is 1k. I got about 100mA thru ptt with 1k.? Plenty for a relay.? Now, the problem is with lowering the value. The bus that R81 is getting the voltage from might be affected, and other block circuits might be affected if too much current is drawn. So I thin think 910 to 1000 ohms should do.?
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On Thursday, June 15, 2023, Edouard Griffiths <
f4exb06@...> wrote:
You mean R81 then that connects the LK1801S input to the PTT signal. This means that if you don't change this resistor it will not turn on the Darlingtons no matter what...
Brgds, Edouard F4EXB.?
