Remote control tester (CB7823E)

This circuit from a 90s Electronics Now, uses a 4010 gate as a signal amplifier. The circuit triggers an indicator LED.

Bistable with two 555 (CB1294E)
This circuit appears in other articles in this section, but it is very interesting. It is a...
60 kHz 60 MHz sweep generator (CB3953E)
This simple sweep generator circuit has been found in older documentation, but can still be easily...
Old Complementary Amplifier (CB20033E)
This circuit is from Motorola documentation from the 70s. The transistors support modern...