Wiring Circuit

If the ac supply is 220 volts,then which resistir should  replace and by which one, 220v is twice of 110v so doubles the value due to the voltage work, try to replace 9k1 with 22k-100k and capasitor voltage 160v.

Ever needed a low power 120volt AC power source for your car, van or truck? Well this circuit should do the trick for you. This is the design for the problem. The circuit will supply 15 watts of AC power to a device. The circuit should power lamps, shavers, small stereos and small appliances. If you draw to much power the circuit will shut down all by itself.

The output of this circuit is a square wave so there may be some noticeable hum on audio units plugged into it. To reduce some of the hum increase the value of the output capacitor which is at .47uf now. That transistor in the circuit are high power PNP transistors. Radio Shack part number 276-2025 are good ones to use or TIP32. The transformer is a 24 volt 2 amp center tapped secondary Radio Shack part number 273-1512 or equivalent.