Review on 🎛️ Enhanced Adjustable Reversing Controller by RioRand by Jerimiah Augustine

I may have a defective unit but I seriously doubt it because I bought two of them. It looks like they've updated their PCB layout since then, but not much to be honest. I want to be very clear: the components used have no chance of using a PWM frequency of 500 kHz. All the through capacitors they use have a capacitance of 0.1uF, resulting in an oscillation frequency of 50+Hz, I've seen 54Hz. In fact, I wouldn't call this device a PWM controller. They use a quad op-amp (LM324) to essentially provide the functionality of the 555 timer chip and comparator. As with many other things in life, what tries to be good at some things usually cannot be good at one thing, and this is the case. Now, after about an hour of tweaking, I have decent performance, but it still won't/will not deliver the advertised 120W with a single transistor. A couple of things to watch out for - 1) You are using a 7812 type linear regulator - this means by definition that if you try to run it at less than 12V the voltage shown at the operating level is not technically regulated. amp.2) If you change the big capacitor on the right side of the board, you can change the oscillation frequency. I connected two 0.01uF (10nF) surface mount parts in series giving a total of 0.005uF and hence a frequency of 1kHz. 3) I don't understand the review mentioning that there is no reverse polarity protection because there is a big monster diode installed right between the inputs/outputs. Again, I found the 0.1uF capacitor to be too large. I went with a 0.000471uF (470pF) capacitor and it was a huge improvement. 4) Small anemic radiators *WILL NOT* give off 120W of heat - simple and clear. However, both the regulator and the pass transistor can be soldered from the *top* board and mounted on the bottom of the board, allowing you to use a decent heatsink. I'm not trying to upset these guys at all, but honestly I think there should be some reasonable sanity requirements for products sold through Amazon. I'm not an electrical engineer, but I've designed circuit boards that revolve around them.