Cassette Amplifier (CB21971E)

Using the CA3130, this NAB EQ preamp has excellent gain. The power supply does not have to be symmetrical.

Full Wave Rectifier with Operational II (CB13214E)
This configuration is from an old Motorola documentation from the 70s. The circuit uses operations that...
Opens and closes effect 4017 (CB17143E)
This interesting circuit causes a set of LEDs to flash at a speed controlled by the CI1 in an...
Dual temperature and level control (CB9474E)
This circuit, which controls both the temperature and the level of a liquid in a reservoir, was...