Simple transformerless power supply circuits
Learn these transformerless power supply circuits, use a capacitor instead, it smaller and lighter than transformer. There are circuits as follows. Read more
Transformerless Power Supply Circuits
220V AC siren circuit using transistors
This AC 220V siren circuit is a simple siren that uses 220V AC as a power supply. It is small size and uses a piezo speaker cause use low power and saving. How it works This circuit is shown in Figure 1 which we use power source by reducing AC-voltage of 220 volts down by the resistors-R1, … Read more
Power on delay circuits and Surge protector without transformer
This is Simple monitor turn on delay circuit, by use contact of relay acts as a switch. When entering an AC main to this circuit. The circuit will delay while Reduce the surge current protection with fuse. Read more