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The series below is a simple inverter circuit that will change the voltage of 12v dc to 220v ac, with use drive transistor 32 as its tip. Inverter circuit is very simple and easy to assemble and is perfect for just starting to learn to assemble electronic circuits, you can use the transformer 2A to produce about 20 watts output. Do not forget to install coolers in its transistors. good luck.

This circuit was designed to provide that continuous light lamps already wired into a circuit, become flashing. Simply insert the circuit between existing lamp and negative supply. Especially suited for car or panel pilot lights, this device can drive lamps up to 10W. Circuit diagram : Two-wire Lamp Flasher Circuit Diagram Parts: R1_____6K8  1/4W Resistor R2_____270K   1/4W Resistor R3_____22K   1/4W Resistor C1_____220µF   25V Electrolytic Capacitor C2_____10µF   25V Electrolytic Capacitor D1_____1N4002  100V 1A Diode Q1_____BC557   45V 100mA PNP Transistor Q2_____BD139   80V 1.5A NPN Transistor LP1_____Existing filament Lamp: any type in the range 3-24V 10W max. SW1_____Existing On-Off switch B1_____Existing V DC source: any type in the range 3-24V suited to the lamp adopted Notes: Break lamp(s) to negative supply connection(s), then insert the circuit between existing lamp(s) connection(s) and negative supply (respecting polarities!). C1 value can be varied from 100 to 1000µF ...

This is a Simple Bell Circuit with Two 555 Timers Project . This simple Bell circuit uses two 555 timers. The frequency is controlled by the capacitors that must be preserved almost identical in value to each other for best results. Fine tuning is done with R1 and R2. The decay time is controlled by R3.  Simple Bell Circuit Diagram

Overview The STK412-000 series are class H audio power amplifier hybrid ICs that feature a built-in shift power supply circuit. These ICs provide high efficiency audio power amplification by controlling (switching) the supply voltage supplied to the power transistors according to the detected level of the input audio signal. Power Sourse of  Two-Channel Shift Power Supply Audio Power Amplifier ICs 180W + 180 W Circuit diagram and other info view