CODE_PRACTICE_OSCILLATOR_Ⅲ

Published:2009/7/10 3:07:00 Author:May | From:SeekIC

Capacitor C1 charges through resistor R1, and when the gate level established by potentiometer R2 is high enough, the SCR is triggered. Current flows through the SCR and earphones, discharging C1. The anode voltage and current drop to a low level, so the SCR stops conducting and the cycle is repeated. Resistor R2 lets the gate potential across C1 be adjusted, which charges the frequency or tone, Use a pair of 8-Ω headphones. The telegraph key goes right into the B+ line, 9-V battery.



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