I use a Philips trimmer for grooming which has a Ni-Cd cell. Almost every time I decide to use the trimmer the battery is dead or is low on charge. I then have to charge it and use it the next day. The charger that came with the trimmer is a puny 4.5V @70mA. Inside the trimmer is a DC motor and a SPDT switch which disconnects the charger if turned on so that its charging only when the trimmer is off. I removed the battery, cut off the wire from the charger with the pin and connect the wire to 5V 2A SMPS adapter. I used 4 diodes to drop the voltage as it was too violent at 5V. The plastic tabs that keep the two halves together got weak and were not able to keep trimmer in one piece so had to use CA glue, hoping to never open it again. Now it works really well.
Hemal Chevli •
11/12/2016 at 06:00 •
I used its with four diodes and after 2-3 min of use the case became very hot. And the speed of the motor also increased. So removed the diodes and added a LM2596 DC-DC step down module. Unfortunately the module was too big to fit in the case. so I added the module in line with the wires and covered it with 25mm shrink tube covered the ends with hot glue. I made a small cut for the small screw on the pot in the module. Now its perfect. I can adjust the speed very easily and not parts are getting heated.
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