0-5V/0-10V Converter Module Analog Input Voltage to PWM 2KHZ-20KHZ

I have bought this module to convert my CNC controller's 0-10VADC analog output into 5V PWM output. It worked great from the first try! The documentation is not the best, but if you know what you know what you are doing, you cannot go wrong with this converter. It accepts 0-5VDC or 0-10VDC analog input. The output is a PWM signal with a frequency of up to 20kHz (pot adjustable) in 2 voltage levels: 5V and 24V. It has also a potentiometer input for manual PWM control! Lots of features for only $15US, folks!

This product basically works as advertised with a few quirks.The device core appears to be an 8 bit micro base. A chinese-only available microprocessor made by Nuvoton.The system takes a voltage on an input relative to ground and produce a PWM pulse at a given frequency based on that voltage. How quickly this might repond in a feedback control loop, I did not evaluate.If I get around to doing so, I'll update this review. There are few components on the board overall, so it seems most of the important guts doing the work are inside the Nuvoton microprocessor.The quirks: There are two outputs, which I believe, are resitively pulled to ground or supply depending on the output. The first is driven with a PNP, which pulls the output high to 5V, quickly (determined by a 7805 regulator). The second uses an NPN, I believe, pulls the output from Vsupply to ground, quickly. Here is quirk number one. I believe as of this review, the output is a collector of a transistor with only a passive pull up or pull down resistor. The pulse, therefore, is nice and crisp on one edge (when the bjt is turned on), but soft in the other edge.... when the passive load does the "driving".., which is really too bad. If you want to drive something external, you may have to buffer the output with a driver.2nd Quirk, the PNP vs the NPN outputs did not have the same duty cycle and I did not debug why. It might have something to do with the passive load pulling either the NPN vs a PNP out of saturation, and the difference in delay associated with that. If I get around to figuring out what is going on there, I'll update the review.Also in the configuration I set the thing up, the pulsed voltage differed owing to the fact one is using the 7805 regulator, I believe, and the other pulling to the input supply of that regulator.I was hoping the frequency adjustment would allow me to go slightly higher than 20khz, but that appears a hard stop....20khz right on the nose is all I could get out of it.The two outputs duty cycle adjust somewhat proportionately.So, I may use this for jumping my pwm project if I can overcome some of the quirks....as is, there are programmable options (serially) which suit my needs better. But this works right out of the box, pretty much as advertised. Oh, PS, no documentation that I could find except on this amazon description page. Another minus.

Do not plan on using a Motor of any size. This PWM unit can only handle about 1/2 amp!. Any more it will over heat or burn up.

It has quite a few features and can fit many applications! To "Casey Jones" I would say, please spare us comments like that and the 1-star rating, if you don't know what you are doing, then don't! No, it is not a motor drive, it was never advertised as such.

Monitored the PWM output with a Scope, proportional to the input 0-10V signal.Module works as expected.NPN and PNP output connection not provided, so just use the NPN output, which works.

It took some rooting to find this. It is nice to know there is a connector for a pot.