This humidity sensor indicates the different levels of conduction of the sensors through an LED bar. The circuit is from Popular Electronics and must be powered by cells or battery.
The 74123 TTL integrated circuit consists of a monostable that can be configured to generate...
This VCO or Voltage Controlled Oscillator was found in a Popular Electronics from 1991 but can be...
In the figure we have the power supply for the 8 W amplifier in the previous circuit. The circuit...