The resistors R1 and R2 consist of 8 220 ohms x 2 W resistors connected in parallel. The dissipation must be higher for high transmitter power. The indicator can be the multimeter.
The passage of an object in front of the LDR in order to cause a momentary shadow triggers the...
The integrated circuit used in this configuration is unusual. It is a symmetric source regulator with...
This is a bridge for the measurement of low value resistances and high values too. The circuit...