This circuit with two operating modes was found in the September 1989 issue of Radio Electronics magazine. Other operational amplifiers can be used. The power supply must be dual.
Found in Texas Instruments documentation from the 1980s, this circuit applies to digital signal...
Using the 4046 PLL we found this circuit in the December 1989 Radio Electronics. The circuit...
This circuit can be used in alarms, data links or áudio links using IR radiation. The circuit is...