Gallery, Projects and General > How to's
How to Make a Power Supply
CrewCab:
Brilliant stuff Darren, thanks :thumbup: ................ looking forward to more :coffee:
CC
Darren:
I've been asked by PM what exactly is an insulating kit used for the regulator chip.
It consists of a silicon sheet as the insulator and a "top hat" nylon washer all held together with a 3mm nut and bolt.
Often heat sinks are fixed to the units chassis for stability and further heat sinking. This chassis is of course grounded, or at least should be, so we don't want the chip shorting out if this is done.
Bernd:
Darren,
Don't forget to add the silicone grease under the chip so it can transfer the heat better to the aluminum plate. :)
Bernd
SPiN Racing:
I have a simple (I think) question for you about the power supply...
I have a power supply similar to what you are doing. It runs a headlight motor from a Mazda. I also wanted to be able to control the speed of it, and have it go faster, and slower.
In order to do this simply I got a transformer and a bridge rectivier (square block with two diodes to make AC into DC) and then ran the output to the motor.
To vary the voltage I used a Light dimmer switch, which allowed me to vary the incoming voltage to the transformer, and dropping the voltage out the other side.
The issue is.. I dont think its very smooth as it does generate a decent amount of heat. The regulated Video Game power supply I had previously, worked very very well, but wouldnt go over about 15 volts. (Was a Peter Chou regulated style)
I gather putting a big capacitor in the circuit will smooth things out.. but honestly I dont know where.. or if you put it across the circuit.. or inline... or use two etc..
Suggestions?
Line-O-Cad
Darren:
Hi Spin,
I'm about to cover this issue, hopefully later today. But yes capacitors are used. What you have there is not true DC and that is why things are running hot.
That power supply as it is will stress the motor.
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