This small amplifier with the fraction-watt LM4862 was found in the November 1999 issue of Electronics Now. The power supply is low voltage.
The integrated circuit can be replaced by more modern operational amplifiers like the 741. The...
We found this circuit in the August 1970 issue of Radio Elecronics magazine. It uses the CA3018...
The configuration shown in the figure is quite simple and can be used to activate a signaling LED...