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kivdenn
Nobel Prize Winner

Uganda
535 Posts
Posted - Jul 31 2009 :  09:59:22 AM  Show Profile  Reply with Quote
I want to use this circuit to produce a pulsed DC that can be used with Cakes automatic charger to charge a 12V battery from a solar panel. Is that possible? If so, how can I change this circuit to work on 12v supply so that I can connect it on Cakes battery automatic battery charger. Thans
Dennis
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audioguru
Nobel Prize Winner

Canada
4218 Posts
Posted - Jul 31 2009 :  12:48:05 PM  Show Profile  Reply with Quote
Guess what?
The "Pulse Width Modulation DC Motor Control" circuit on this site does not produce PWM.
It is simpoly a variable frequency Cmos oscillator.

Download Attachment: Cmos oscillator again.PNG
11.08 KB
Edited by - audioguru on Jul 31 2009 12:50:39 PM
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kivdenn
Nobel Prize Winner

Uganda
535 Posts
Posted - Aug 03 2009 :  12:07:52 PM  Show Profile  Reply with Quote
But can it change smooth DC to pulsed DC ?
Thanks
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boron
Mad Scientist

Canada
223 Posts
Posted - Aug 03 2009 :  12:32:20 PM  Show Profile  Reply with Quote
Yes it will produce a square wave at its output. By definition an oscillator takes a smooth dc signal and, well, oscillates it to produce a repeating signal pattern, in this case a simple square wave.

What audioguru is telling you is that this circuit simply varies the frequency of the pulses and not the actual duty cycle. Since for true PWM to function the duty cycle must change this is not true PWM. It will still control motor speed to a certain extent, but less effectively.
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kivdenn
Nobel Prize Winner

Uganda
535 Posts
Posted - Aug 12 2009 :  05:45:25 AM  Show Profile  Reply with Quote
What is the frequency of this oscilator?
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audioguru
Nobel Prize Winner

Canada
4218 Posts
Posted - Aug 12 2009 :  10:01:07 AM  Show Profile  Reply with Quote
quote:
Originally posted by kivdenn

What is the frequency of this oscilator?

The frequency of this Cmos oscillator is 0.455/RC.
with the 100k pot set to max the frequency is 455Hz.
With the pot set to minimum then the oscillator will be shorted and it will stop. The pot should have a resistor in series to prevent a short circuit.


Download Attachment: Cmos oscillator Aaron.PNG
4.08 KB
Edited by - audioguru on Aug 12 2009 10:03:53 AM
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