This relay shield circuit for old computers was found in January 1983 Radio Electronics magazine. The relays are sensitive types with currents up to 200 mA.
The circuit shown in the figure can be designed with more modern operational amplifiers, as it is...
This transmitter has a power of only 2 W, but with a good antenna it can send its signals over...
August 2017 - The new DPS1133 power switches from Diodes Incorporated for currents up to 3.3 A...