periodically on / off OPA 134 electret amplifier

Thread Starter

Prabath Gamage

Joined Sep 1, 2017
1
I need to on and off my OPA 134 electret amplifier.
Here are the constrains.
Has to be battery operated.expect long run.
On off time should have about 5 sets. (1 min / 1 min, 1/2, 2/5, 5/10)
beep sound should be inserted to the output in selected time period. 5min, 10, 15 etc.
this device is used for concentration practice so no or very low clicks when on / off expected.
appreciate help.
 
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