70w inverter

70 w basic invertor circuit for the beginners

This mini inverter circuit can be completed through the following simple steps:


Cut two sheets of aluminum of 6/4 inches each.

Bend one end of the sheet as shown in the diagram. Drill appropriate sized holes on to the bends so that it can be clamped firmly to the metal cabinet.


Also drill holes for fitting of the power transistors. The holes are 3mm in diameter, TO-3 type of package size.


Fix the transistors tightly on to the heatsinks with the help of nuts and bolts.


Connect the resistors in a cross-coupled manner directly to the leads of the transistors as per the circuit diagram.


Now join the heatsink, transistor, resistor assembly to the secondary winding of the transformer.








Fix the whole circuit assembly along with the transformer inside a sturdy, well ventilated metal enclosure.

Fit the output and input sockets, fuse holder etc. externally to the cabinet and connect them appropriately to the circuit assembly.

Parts Required for the circuit diagram

You will require just the following few components for the construction:


R1, R2= 100 OHMS./ 10 WATTS WIRE WOUND

R3, R4= 15 OHMS/ 10 WATTS WIRE WOUND

T1, T2 = 2N3055 POWER TRANSISTORS (MOTOROLA).

TRANSFORMER= 12- 0- 12 VOLTS / 5 AMPS.

AUTOMOBILE BATTERY= 12 VOLTS/ 32AH

ALUMINUM HEATSINK= CUT AS PER THE REQUIRED SIZE.

VENTILATED METAL CABINET= AS PER THE SIZE OF THE WHOLE ASSEMBLY