High impedance stage (CB20564E)

This high input impedance amplifier stage was found in a 1963 documentation. The transistor germanium of the time.

Automotive Tachometer LM2907 (CB14296E)
We found this circuit in the National Semiconductor Linear Applications Handbook of 1994. The...
Scale Adapter for Multimeter (CB16845E)
The purpose of this circuit is to allow common analog multimeters to measure low resistances, on...
Bass Control (CB21294E)
This circuit with losses of 20 dB at 350 Hz was found in older documentation, but it applies to...