Code-Practice Oscillator Iii

Capacitor CI charges through resistor Rl, and when the gate level established by potentiometer R2 is high enou
Code-Practice Oscillator Iii - schematic

gh, the SCR is triggered. Current flows through the SCR and earphones, discharging CI. 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 CI be adjusted, which charges the frequency or tone. Use a pair of 8- headphones. The telegraph key goes right into the B + line, 9-V battery.

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