BRINGSMART 12V 16rpm DC Worm Gear Motor 70kg.cm High Torque Turbine Electric Gearbox Motor Self-Locking Reversed Mini Engine Geared Motor for DIY Robot Door Lock Curtain Machine (12V 16rpm)

Great buy

I've purchased a few of these gear motors and will continue to do so, they are decent. I bought 3 of the motor speed controllers also, and one arrived dead and the other 2 went up in smoke after just a few minutes of use. I didn't do a post mortem on the dead controllers, but it seems from the extreme heat that the 7805 regulator is what burned up, or maybe the control chip itself shorted and then the regulator went next. With the damaged controllers, the motor still runs and can reverse, but only at full speed. The biggest thing I don't like about these controllers is that the control chip itself is not a standard, servicable part. The little 8-dip IC is actually an 8-bit microcontroller with custom programming, so if (when) it dies, you can't just swap in another. Competitors' products use an op-amp or 555 instead, which are easily replaced parts. Maybe there is some benefit to this custom chip, but it seems like overkill and it makes the thing end-user non-repairable. Sure, $13 is not a lot of money to replace the whole board, but a $0.70 IC is still a lot cheaper.

यह बहुत बढ़िया मोटर है और जब मैंने खरीदा था ₹2100 प्राइस थी इसकी लेकिन अब जो प्राइस है बहुत ज्यादा

Good product does the job

Works great for converting a manual shade to motorized shade. I used the other reviewer's parts list (thanks!) but I opted for a stronger power supply (5A/60w). It's plenty strong and reliable so far. If using it outdoor, I would probably fabricate a housing to protect it from moisture. I like how it holds the position when the motor stops so you can stop the shade halfway.