Found in American documentation from the 90s, this circuit uses TTL technology and is therefore compatible with microcontroller drives. The circuit must be powered by a 5V power source.
This receiver for a modulated light intercom was found in a 90s Elektor. The audio amplifier can be...
If the input voltage falls below 12 V the LED glows up. Other voltages can be monitored by...
Found in an American 1980s documentation, this circuit generates high-intensity pulses for a...