simply i have a source of variable dc current i want to convert it to variable ac (source= 3 to 12 volts dc, required corresponding ac volts 3-12 volts ac)
If you don't need a sinusoidal waveform you could generate the 'ac' by supplying the squarewave to the input of a suitably biased high speed opamp with a gain of 2.
If you don't need a sinusoidal waveform you could generate the 'ac' by supplying the squarewave to the input of a suitably biased high speed opamp with a gain of 2.
If you don't need a sinusoidal waveform you could generate the 'ac' by supplying the squarewave to the input of a suitably biased high speed opamp with a gain of 2.
It is even easier than that. Just generate a square wave of the desired amplitude and frequency using (for example) a 555. Use a dc blocking capacitor between the output of the 555 (pin3) to block the average DC value of the square wave. The resulting wave will be symmetric with respect to ground.
i wan to explain more about that:
the source power = 3-12 v dc
i want to convert it to 3-12 v ac peak-to-peak, current = 1 amp
the generated ac will be stepped up in a transformer up to 220 volts
(the main aim is to get a variable ac from 3 to 12 volts to use as feed to the step up transformer)
* All volts are measured by multimeter
the converted 12 volts ac is RMS
The load (after step up transformer which will convert 12 ac to 220 ac) requires 0.055 Amp.
the Problem i face is : what circuit can make the (3 to 12 v ac) is variable that i can change the out put transformer voltage)