Phase Shift Oscillator (CB20565E)

This low-frequency oscillator was found in a 1963 documentation. Capacitors determine frequency. The transistor used is germanium.

H Bridge Current Monitor (CB5258E)
This circuit was found in a 2005 Linear Technology component manual. The circuit is full bridge...
AC126 amplifier stage (CB4265E)
This is an amplifier stage with a typical germanium transistor from the 60's to the 70's. The...
Wireless Headphone Transmitter (CB4582E)
We found this circuit in a 1995 publication. It makes use of infrared LEDs of the type existing at...