Maybe the circuit is simple and cheap so the output frequency changes when the load resistance is changed.i have ups and the output frequency is 200+hz and remain variable when it is inverting from 12vdc. there is one variable which is used to adjust the frequency to 50hz, but i have adjust it but the frequency is above 200+Hz without load.
No i do not have the schematicsHello,
Do you have the schematic?
Bertus
the transformer is burn and the transistor are also burned so i brought new transformer and transistor.Please post a usable schematic.
You mean you had a working UPS and then you swapped the transformer and this changed the frequency?
if i do not change the resistance the frequency is not remain the same.Maybe the circuit is simple and cheap so the output frequency changes when the load resistance is changed.
what are that propertiesHello,
The frequency will have changed due to the other properties of the "new" transformer.
Bertus
Hello,Hello,
The impedance and resistance of the transformer will be different.
Ringing could lead to the experienced higher frequency.
Bertus
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