🚀 go-pugleaf

   I am a sophomore engineering student and have been researching and
trying to develop a new type of car amplifier that runs cooler and
the taim was at the power supply. 12v simply is not enough voltage
to power speakers to large amounts of power unless multiple amps
and speakers are used. So most manufactuers use mosfet power supplies
that step up the 12vdc to higher levels by first providing a 60hz
oscillating signal and using power mosefets to switch the 12v power
to a step up power transformer which results in a larger square wave ac
voltage output. This is rectified and the result is a dual polarity
high voltage dc power supply for power amplifiers. But the mosfets although
amazing devices have internal resistances that cause them to heat up a lot
under heavy current loads. So I tried a mechanical method using 2 high
speed quality relays. The design amazingly worked with little problems,
like noise from the 60-hz modulated relays, a small amount of magnetic
intereference which can be solved and slightly warm relays. The only
major problem I can see is reliabilty. How many cycles can a relay take
before they burn out, thats the only question. I must do more work and
improve on this. Another small problem is irregularity, relays are not
perfect bounceless switches and spikes and irregularities on the scope
show up frequently on the square wave ac output. I have yet to try
this with a power amplifier. Overall the major advantage is cost including
no expensive mosfets, no large metal heatsinks and little waste and its
small size makes it perfect for a car. The only real source of heat is in
the step up transformer. I am not an enginneer yet and I doubt that I
found something new. I am open to any questions, opinions and comments
and would like to know if I have something here. Thankyou

Neil Gandler