This circuit was found in a 1967 RCA documentation. The components are of the time. The circuit limits the current to 50 mA when the battery is fully charged.
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...