Quote:
Originally Posted by low_bass_makker  to achive higher wattages firstly one will have to make the DC-DC power supply which is a challange itself as one would be requiring more than 24-0-24 volts to power an amp which would be making more than 400 rms...so it will be hard time ahead clip dont get dishearted we all are here to help you..... |
I could not agree more. It is easier to build a power amplifier, once you have the power supply all sorted out.
When you build an amplifier for home, you take the input power for granted.
Keeping it simple:
We have 230V/50Hz/15A (current approx) on tap. All we need to do is get a suitable step down transformer (preferably toroidal), build a decent recitifier (using bridge diodes and the ilk) and a nice capacitance bank (10,000 mfd+) and your power supply is ready.
Alternatively, you can even use a X-0-X transformer and build a centre ground +/- supply for use with push pull circuits.
Now comes the car supply:
You have 12Vdc/30A (current approx) on tap. That means in most cases you will need to step up the voltage. Also, the question of transformer coupling becomes difficult as the voltage is already in DC (transformers only work on AC)
Hence you need to CHOP up the dc voltage, regenerate AC out of it, step it up etc.
Building a chopper step up power supply is far more complicated than a transformer based AC-DC step down supply. Also requires certain components for accuracy (Most standard car amplifier supplies use opto-couplers, standard BJTs, FETS and gates like theyre going out of style) which may not be that easily available. Also building of chopper transformers requires precise (read:deadly) accuracy.
Building a 12Vdc power supply, that runs a power amplifier that can drive 400W is not something for the faint of heart. I do not say it is impossible, but I suspect that for most average DIYers, it's a morsel that may turn out to be difficult to chew.