This 50 Hz rejector or notch filter was found in a 1975 documentation. Other frequencies can be obtained by changing components. The filter uses a Wien network and must use a symmetrical power supply.
This is a simple Power supply for TTL circuits using the 7805 IC. This IC can source up to 1 A to...
To small metal plates are used as sensor in this circuit. The skin resistance is enough to trigger the...
The sequential tones of this musical bell are adjusted in the trimpot and the speed with which they...