3-decade VCO (CB21326E)

This circuit generates signals from 10 Hz to 10 kHz. We found it in a Popular Electronics from the 90's. The components admit equivalents.

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Variable Output Oscillator (CB16513E)
We found this circuit in a 1998 publication. The circuit has controls for both frequency and...
Auxiliary Telephone Bell (CB18817E)
This circuit for conventional lines was obtained in a 1996 documentation. The circuit uses common...
Capacitance Multiplier (CB16664E)
This is the conventional version of capacitance multiplier with operational amplifier that appears in...