This sonic control circuit for a small robot turtle was obtained in an American documentation from 1967. The circuit uses a ceramic capsule to fire an SCR.
Found in Popular Electronics from the 90s, this circuit is intended for a radar emitting pistol. The...
This circuit can generate signals up to 5 MHz according the power supply voltage. Frequency is...
This transmitter emits a modulated signal at a frequency given by the first transistor in the...