This circuit is from Motorola's Linear Databook from 1990. The integrated circuit and transistors are uncommon, but the circuit can be assembled with equivalents.
This power supply that can supply current according to the LEC is suitable for small projects. The LED...
Common diodes when forward biased present a voltage fall of about 0.6 to 0.7 V. This voltage fall...
This 2003 circuit uses two types of sensors: by reed-switch and by infrared. If the magnetic...