This circuit was found in documentation from 1977. The integrated circuit used is a PLL.
This operational filter was found in a Texas Instruments publication from the 90s. The circuit...
Relays from 20 mA to 200 mA can be driven by this sensitive circuit.6 or 12 V relays can be used...
This 3-transistor timer was found in the January 1994 issue of Electronics Now magazine. The...
