Another pwm request... - Electronic Circuits Projects Diagrams Free

h-tone · 23rd August 2008, 09:29 PM

Hi first time here; definitely not the last....
I'm looking for a PWM circuit that can be controlled by an DC voltage. The 555 based ones don't seem to be well suited for this. I don't know much about other single-chip options. I'm all about analog computing and want my output voltage (0-3 volts, but this can be modified...) to directly control the speed of the motor.
To design a circuit from scratch I imagine an inverter-based oscillator plugged into some sort of inverter based pulse stretcher with voltage control? I don't know...
But ideally done with a pre-existing chip...
Any ideas?

**3v0** · 23rd August 2008, 09:45 PM

Welcome...
It would be so much easier to use a uC.
But I am biased.

h-tone · 23rd August 2008, 09:52 PM

nooooooooooooooooooooooooooooooo!!!......must..... ...stay............analog.......twitch...........t witch.........

yngndrw · 23rd August 2008, 10:46 PM

This kind of setup suit your requirements ?
http://www.cpemma.co.uk/pwm.html

Triangle wave generator and a comparator.

h-tone · 23rd August 2008, 11:11 PM

That looks perfect! Thank you! I knew there was a better way...

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23rd August 2008, 09:29 PM	(permalink)
h-tone	Another pwm request... Hi first time here; definitely not the last.... I'm looking for a PWM circuit that can be controlled by an DC voltage. The 555 based ones don't seem to be well suited for this. I don't know much about other single-chip options. I'm all about analog computing and want my output voltage (0-3 volts, but this can be modified...) to directly control the speed of the motor. To design a circuit from scratch I imagine an inverter-based oscillator plugged into some sort of inverter based pulse stretcher with voltage control? I don't know... But ideally done with a pre-existing chip... Any ideas?

23rd August 2008, 09:45 PM	(permalink)
3v0	Welcome... It would be so much easier to use a uC. But I am biased. __________________ search engine for electronic parts Junebug USB PIC programmer kit., USB Bit Wacker, 3v0's Homepage The 15 Minute Printed Circuit Board! (+drill time)

23rd August 2008, 09:52 PM	(permalink)
h-tone	nooooooooooooooooooooooooooooooo!!!......must..... ...stay............analog.......twitch...........t witch.........

23rd August 2008, 10:46 PM	(permalink)
yngndrw	This kind of setup suit your requirements ? http://www.cpemma.co.uk/pwm.html Triangle wave generator and a comparator.

23rd August 2008, 11:11 PM	(permalink)
h-tone	That looks perfect! Thank you! I knew there was a better way...