Field Strength Meter for TV (CB22312E)

We found this circuit in an American transistor book from the 1960s. The transistor is made of germanium and the circuit runs from 40 to 226 MHz.

Analog switch (CB21253E)
This circuit was found in an Electronic Design from the 90s. Operational amplifiers admit modern...
Ladder Generator (CB14195E)
The presented circuit is based on an operational transconductance amplifier (OTA) having been...
Crystal Sinusoidal Oscillator (CB5129E)
Found in an 80's documentation this circuit uses an integrated from the uncommon era today. Other...