Adjustable Notch Filter (CB14918E)

This circuit was found in an old Poptronics. Operational amplifiers can be replaced with equivalents. The power supply must be symmetrical.

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100 kHz to 1 MHz Oscillator (CB12815E)
This circuit can generate signals from 100 kHz to 1 MHz depending on the L1 coil. For the medium...
LM380 Amplifier (CB24943E)
This is another of the circuits with the LM380 that we have in this section. We found it in an...
Sound Electric Photocell (CB16403E)
This project was found in a 1981 documentation. It consists of an interesting audio oscillator that...