This circuit was found in a 90s Popular Electronics. With it, using a 4066, it is possible to control between 1 to 100 the gain of an operational amplifier like the 741.
This circuit obtains phase-inverted signals from a single signal. The circuit uses two LM741...
This circuit was found in a 1963 magazine. The magazine no longer exists, but the circuit can be...
a This circuit was obtained from a 1978 Practical Wireless. It causes a low-power 1.5V lamp to...