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 circuit is suitable for modulating small FM transmitters for eavesdropping or espionage. The...
This circuit trips with negative pulses and the value of C depends on its intensity. C1 determines the...
The integrated circuit is not common nowadays since the configuration was obtained in Motorola's Linear...