B21126E)
This circuit was taken from an old Popular Electronics. The circuit can have its frequency changed from an external signal. The center frequency is given by C1.
This bridge circuit is designed for 8-ohm speakers delivering a few watts of power. The circuit is from...
The integrated circuit 4136 consists of operational amplifiers of type 741 in the same enclosure and...
This circuit allows selective relay actuation in the same line according to the applied voltage....