This circuit was found in a 1999 publication. Its purpose is to flash two LEDs according to the sound of an equipment and to randomly flash three LEDs at a controlled frequency
This oscillator was found in a 1967 General Electric documentation. The UJT is P-channel, an unusual...
Found in an Elektor from the 90s, this circuit triggers a Sonalert-type buzzer when the sensor is...
This precision circuit can provide timings from 0.2 milliseconds to 3 minutes accurately. The...