Features:

  • DROK pulse generator module operating voltage range is DC 3.3-30V, adjustable pwm frequency range is 1Hz-150kHz, adjustable duty ratio range is 0%-100%.
  • Application: it can be used as a square wave signal generator, generate square wave signal for experimental development; generate square wave signal to control the motor driver; generate adjustable pulse for MCU; generate adjustable pulse to control the relevant circuit (PWM dimming speed application etc).
  • High Frequency Resolution: frequency in range 1Hz~999Hz, display resolution is 1Hz; range 1.00kHz~9.99kHz, display resolution is 0.01kHz; range 10.0kHz~99.9kHz, display resolution is 0.1kHz; range 1kHz~150kHz, display resolution is 1kHz.
  • TTL Level Communication: the frequency meter is designed with single-chip TTL level communication, communication standard is 9600 bps.
  • LCD Display: the blue LCD clearly displays frequency and duty ratio, PWM output can set frequency and duty ratio independently.
Does keep a good pace

A decent simple clock generator via sinking resulting a squared edge mark space ratio. Use caution when setting the frequency below typical 100Hz or so when reading from the output, the module can "freeze" to low for a moment the resume, duty cycle adjustment does not seem to result in any halt during adjusting whilst the meter is running.

Product appears tone very well made.

I think it would be very helpful to customers if the shipment included tech info on input and output voltages and how to best use the device, I don't understand the duty % function. I had to go to Droking.com for info on the component. It appears to have interface capability. It would be nice if I didn't now need to go research that function.

Great little things! The basis for my ultrasonic dog pain blaster.

This signal generator is the answer to my prayers... I have these dogs on either side of me that bark bark barkbarkbark any time the air moves. I'm looking for something to make a 23khz tone and drive some really powerful ultrasonic tweeters. After looking for many schematics online I found these. VERY easy to hook up and use. On a desktop proof-of-concept test they power right on and drive the tweeters at a low power. So now to run the signal through an 800 watt amp and point it at the neighbors dogs when they bark for nothing. Literally it took me longer to get the speakers out of the blister pack than it did to set up the rest of the project.

It does what’s supposed to: square waves galore!

Straightforward to setup, works as intended, no fumbling with screwdrivers, and has its own frequency target display. As to the accuracy of the frequency I can’t say, but it seems ballpark in the frequency it should be.

Five Stars

Nice modulle. Very accurate.

Great purchase

My board came in very secure packaging. I was pleased that the board was exactly what I was expecting. It performs very well, from 3-30 volts. The buttons are very durable. Over all great purchase if your looking for pwm.

Best bang for the buck timer circuit.

I love these darn things. The price is great and I have purchased several. Just add a mosfet of your voltage and amperage needs and it will drive most any lower frequency project. Take note though the square wave isn't much of a square wave at it's higher frequency range. Works perfect to set a drive frequency for coils in transformers or pulse width modulate DC motors etc.... I've been using them to test fuel injectors and coils on cars and also some high voltage coil drivers such as flyback transformers.

Amazing for $8.00

I am triggering electronic strobes. So easy to use.

Works very well for the price

I needed an square wave source that I could adjust to a range of frequencies. This circuit board takes 3.3 to 30 volts in and outputs a square wave with a frequency and duty cycle that can be manually adjusted by pressing the buttons. The amplitude is determined by the power supply voltage. The claimed accuracy is 2%, over the range of 20 to 200 Hz, it was about 0.5% compared to the frequency displayed. I have purchase other products made by Drok (USB current measurement) and they have also worked well.

Rock Solid!

Very impressed with this product. Looking for a square wave generator to override the feedback signal from a fan assembly. Hunted all over the internet for a simple 555 timer assembly, but then came across this offering. Ordered one initially and had absolutely no problem implementing the solution. The only challenge was sizing the power supply resistor for the proper voltage drop (easy!). I ordered twenty more and have installed all without incident. Disclaimer: I did investigate the ramifications of disabling this fan assembly in advance to to determine if the reduced cooling could be tolerated by the product. All is good!

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