100 kHz Oscillator (CB22379E)

This is the single-sourced version of the previous oscillator. Frequency can be changed by changing C1.

Metal locator (CB7883E)
Found in a 1966 documentation, this “coin finder” uses components from the era operating at 2.1...
High Pass Filter 741 (CB16119E)
This filter operates in the “opposite” way to the previous one (CIR8814), cutting all signals...
Stepper motor as encoder (CB21248E)
In the figure we have the way to use a stepper motor as an encoder. Operational amplifiers can be of...