DROK Frequency Generator, DC 3.3V-30V 5-30mA 1Hz-150kHz Adjustable Output PWM Pulse Duty Cycle Square Wave Function Signal Generator Module

Worked perfectly. Modified its output stage and wrapped some other circuitry around it to create a J1772 Control Pilot signal generator for EMC testing at a publicly traded electric vehicle manufacturer. In a judo move that usually works against Murphy's law, I bought 2 or 3 of these, to guarantee the first one would work right, never break, and never get lost.

The media could not be loaded. If you are looking for a basic speed controller to run brushless fans on a automotive project. This simple one dial controller work great. Easy to use and wire up. Cheap and work perfectly. And the best part is when the box is disconnected from power and reconnect it, it remembers your last setting to set you fan speed and leave it till you need it. I cruise around town with a 462 cammed BBC at 40% fan speed. with the AC cranked in 98 degree wether in traffic. Dial it up to 70% and works great

This is a nice little budget-friendly frequency source.Reasonably low frequency drift, and low noise content on the square wave output these work great for operational burn-in testing in my test lab at work.If it could adjust the frequency in 0.1Hz increments it would have been a full 5 stars.

works great. did exactly what I needed it to do. great for test pwm components

Bought this to rig up a manual pwm signal generator for the 4-pin pwm fans in a noisy homelab server. I powered it right off the 12V fan rail and ran the output to all the fans' control wires. Set the frequency to the one specified in the fan's datasheet, bam, works like a charm.

Let's start with the good...For very little money you are getting a square-sine-wave generator that has a range from 1Hz to... your arm will die before you hit the max. It remembers its settings after power off, so you can set it to what you want and then leave it there and know that it will retain that setting.Now the bad...The tuner will fail you and catastrophically fall apart within 2-3 minutes of use. If you know dead certain what frequency and duty cycle you want before you open the box, then this will probably work for you. If you plan on changing these values from time to time then this item will not work for you.

My biggest gripe is how difficult it is to insert the wires into the terminals when they’re inside a tight fitting box. Looking at the similar pwm generators on Amazon, this terminal is a common one so it’s probably not going to be a better on a different brand. Along the same lines, you’ll want to make sure your vertical opening is big enough to allow space for the wires/lugs to fit too otherwise it wont fit. I wish it was designed a bit better so there wasn’t such an opportunity for this vertical slop since once it makes it past the wires, there’s no more need for that extra space and your generator may slide up and down a bit while using it.Function wise, it seems to work well. I’m using it to drive the motor on my wife’s bricked “smart” treadmill. Since this thing outputs the same voltage as whatever it’s being fed, I used a 12v to 5v buck converter to lower the input voltage to a nice stable 5vdc.I like that it remembers the last settings so she doesn’t have to fiddle with setting the frequency each time. The only potential issue I made her away of is if the power goes out and she’s full bore on the thing, then it will go back to full bore when the power comes back on. Luckily during testing, our treadmill’s controller won’t start the more unless the controller first sees a duty of 0%, so that situation of it starting back up is mitigated but yours may not be, so I’d suggest testing it’s behavior beforehand.

Quick delivery, worked as expected, recommended.