FREE CIRCUIT DIAGRAMS 4U: Low-Cost Transistorised Inverter

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Friday, October 02, 2009

Low-Cost Transistorised Inverter

This inverter can drive medium loads of the order of 40 to 60 watts using battery of 12V, 15 Ah or higher capacity.

Transistors T1 and T2 (BC548) form a 50Hz multivibrator. For obtaining correct frequency, the values of resistors R3 and R4 may have to be changed after testing. The complementary outputs from collectors of transistors T1 and T2 are given to PNP darlington driver stages formed by transistor pairs T3-T4 and T6-T7 (utilising transistors BD140 and 2N6107). The outputs from the drivers are fed to transistors T5 and T8 (2N3055) connected for push-pull operation.

You can get higher wattage by using 2N3055 but at that situation you should reduce the value of R7 and R8 while increasing the wattage.