Crystal variable oscillator (CB9506E)

Found in Radio Electronics from the 90s, this circuit can vary the frequency in small values around the crystal frequency.

Standard cell (CB21538E)
This circuit was found in an old Philips publication. The circuit supplies a voltage corresponding to 4.5 V...
Pulse generator (CB8917E)
This circuit was found in Radio Electronics from the 90s. It uses a transconductance operational...
500 MHz Oscillator (CB9393E)
This 500 MHz oscillator has an output power of 1 W when powered by a 20 V source. The circuit was...