Electronic and others...

Circuit diagram of the light-sensitive fire alarm is shown in Fig. 1. It is built around L14F1 photo transistor (T1), BC547...

TL431 and LM431 are relatively low-noise, stable and low-cost shunt regulators. These can be used to build all sorts of power...

Presented here is an LCD power-saving backlight-control circuit. An LCD is used in many projects for indication or information display since...