Seven-V narrow pulse from 2 Hz to 50 kHz are produced by this circuit. C1 through C4 provide frequency ranges in decode steps. R1 and R2 control the charging time of C1 through C4. R2 is a potentiometer used to set the frequency. R8
controls pulse width. Pulse width varies from 7 us to 10 ms. Depending on the frequency, R8 can be deleted if it is not needed.
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