Found in an American 1980s documentation, this circuit compares signals from two TTL sources, providing an output that depends on the frequency difference. The circuit can be used as a shield.
This second-order filter was found in old American documentation and can be applied to other...
Found in an old Elektor, this circuit uses two 7-segment displays to indicate the volume of an...
Found in a 90s Popular Electronics, this circuit makes use of power MOSFETs. Equivalent MOSFETs can be...