2015年11月29日日曜日

Standby Beep circuit

"Houston,  we have problems."

I'm trying to simulate "Standby beep circuit".

(1) Timing control of PTT delay and starting beep sound

     It is a little difficult to make good timing of start beep sound when I press PTT switch. Controlling delay time of PTT is not always easy as I expected.
I'm still adjusting it. 


(2) Beep frequency is about 3KHz.
      It is a little high. I'm adjusting it to be 2.5[kHz].



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