We found this circuit in documentation from the 90s. Instead of a voltmeter, you can use the voltage scale of a multimeter. The circuit tests batteries under load.
This circuit is from 1994 documentation by National Semiconductor. What it does is convert the...
This circuit with the known PLL 567 can be found in other versions in this section and in this...
This sophisticated circuit of the coin-toss game was found in an American 1980s documentation. The circuit...