This high voltage oscillator with a neon lamp was found in a 1969 documentation. The circuit is synchronized by pulses of 1 kHz. The power voltage is 160 V.
This traditional detector configuration is from an old publication where the MC1555 is the...
This two-transistor emitter-coupled oscillator circuit with capacitive feedback was found in the...
If the reader is skilled, he can mount this spy micro-transmitter with SMD components and obtain an...