HiLetgo 5pcs NE555 Pulse Frequency Square Wave Rectangular Wave Signal Generator Signal Generator Module Stepper Motor Driver DC 5V-15V Powered

I checked low range and high range operation. I was able to to get 550khz output with 12 volt input, but the card was getting a little warm after 5 minutes. The photo shows 200Khz and close to 50% on and the card runs cool. The quality for such a low cost item is what was surprising. The adjustment screws are smooth and no jumps in the output.

Worked fantastic for my bmw seat retrofit project into my 4runner. "Tricked" the control module to seeing a can bus signal.

This is a nice NE555 circuit board with all the accouterments added for using the 555 IC for a myriad of projects. Depending on your application using this pre-made module will save you time and money. Merely changing a jumper gives you a tremendous frequency range. This 5 piece set is a good price compared to shopping around on Amazon for the exact same module. Sometimes, on Amazon, you can find different combinations of this 555 module with some needed bread board or wiring sets that you might not have in stock on your electronics work bench. This module deserves a rating of 5 for its superior design and excellent workmanship. However, I gave this item a lower rating because THERE WAS NO DATASHEET included. I mean how hard would it have been to include one single piece of paper with the wiring diagram and jumper and trimmer pot adjustments?!!!. I have attached just such information via photographs I found while shopping on Amazon.

i installed an old garage door opener in my old barn. I did not have the door close sensors for it and could not get it to work without them. Until I ran across this little gem. I am not an electronics expert by any means but with this board and a youtube video I was able to bypass my door sensors and the door now opens and closes just fine. there are a few videos out there showing how to do this.

Bypass garage door sensors and it works so well. Use extreme caution when bypassing any safety device. Not recommending if you have pets or children. Many other uses for the 4 units remaining.

There's no documentation provided, but it's easy to find the circuit online or simply to trace it out. Obviously the two adjustment pots are not independent, and achieving any specific timing takes a decent oscilliscope and patience, but for rough work you don't need this. I glued two metal pins (power & ground) into the holes provided for mounting, wire wrapped them to the already existing power pins, and these guys now plug perfectly into a standard breadboard.

I bought because of the price! These 555-based, signal generator circuits are well built and I was able to set the desired frequency following the comments written by another reviewer.

No issues.