Hi all.
That can be done easily by using the 5V, -5V, 10V, 12V, -12V rails. the 12V rail can supply up to 10A current and the -12V can supply about 1A or less. These varies according to the manufacturer quality.
It can be used as a "constant voltages supply" but a voltage regulator circuit can be built to make it a variable voltage supply.
With considering the needed output current, something like this can be done:
But I didn't build anything yet. I'm looking around the PWM IC (TL494/KIA494 or other) and specifically at the feedback circuit. I think a small change in components, like replacing a resistor with a potentiometer will make us able to vary the output voltage up and down. Using the 12V and -12V rails gives us a variable power supply with max voltage up to 24 at 0.8 or 1A. Using a switch between -12V rail and 0V makes the max. voltage 12V with current up to 10A. This will be very easy and helpful and cheap, and it should work properly
To make this thread a completed project, I hope we find what component can be replaced or what changes should be done. The feedback pin is pin#3
Regards,
Hazim
That can be done easily by using the 5V, -5V, 10V, 12V, -12V rails. the 12V rail can supply up to 10A current and the -12V can supply about 1A or less. These varies according to the manufacturer quality.
It can be used as a "constant voltages supply" but a voltage regulator circuit can be built to make it a variable voltage supply.
With considering the needed output current, something like this can be done:
But I didn't build anything yet. I'm looking around the PWM IC (TL494/KIA494 or other) and specifically at the feedback circuit. I think a small change in components, like replacing a resistor with a potentiometer will make us able to vary the output voltage up and down. Using the 12V and -12V rails gives us a variable power supply with max voltage up to 24 at 0.8 or 1A. Using a switch between -12V rail and 0V makes the max. voltage 12V with current up to 10A. This will be very easy and helpful and cheap, and it should work properly
To make this thread a completed project, I hope we find what component can be replaced or what changes should be done. The feedback pin is pin#3
Regards,
Hazim
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