Capacitance multiplier (CB7803E)

We found this circuit in an old Popular Electronics. The circuit can be applied to other operational amplifiers.

DC Motor and Stepper Motor Control (CB12516E)
The A3906 integrated circuit from Allegro Microsystems (www.allegromicro.com) consists of a PWM...
Video Modulator (CB5356E)
This analog TV circuit can be used on a small transmitter. The circuit is from an 80's American...
Variable gain operational amplifier (CB8068E)
This circuit is from an Electronics Now from the 90s. It applies to almost any operational...