This circuit indicates a digital value through a moving bar. The circuit is TTL and must be powered by 5 V. We find this circuit in a Texas Instruments optoelectronics manual.
This small audio amplifier of a few watts found in television sets was published in the magazine Radio...
This circuit monitors a common analog telephone line indicated for its use through LEDs. The...
This circuit activates a machine to dry hands (fan and heater) when the sensor detects the...