12V high power Amp

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Richard Ellis

Richard Ellis

Member
Joined 2006
Be aware of the immense current requirements required by the bulk of those car-amps....in the car environment, the 12V current supply is virtually unlimited. As such, building a home version power supply maybe outside boundries of practicality....a football sized transformer, etc.




----------------------------------------------------------------Rick...........
 
indianajo

indianajo

Member
Joined 2010
Football size transformers are available in 100 A battery chargers, the older and less electronically controlled the better. Flea markets usually have one.
OTOH the problem with 12v audio is the 2 and 1 ohm speakers, that make sound like a car. while this was all the rage 1990-2010, I hated that sound. Nothing like reality IMHO. Speakers rated in watts capability, not in how flat the frequency response was.
If you want a low power +- 12 v amp to make nice undistorted low volume sound, see http://www.diyaudio.com/forums/solid-state/297453-tips-first-amp-design.html
It is designed to run off a PCAT power supply +-12 feed. 8 ohm speakers are good, 16 ohms are better for something like this.
I listen with my 60 W/ch amp to average 1/4 watt music, but occasional peaks of 180 W can happen in the classical repretoire. At least on LP, CD masters were mostly compressed to cover up the road noise of an automobile. CD is a great media if the marketing department would stay out of the mastering room.
Have fun.
 
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edisonpc

Member
Joined 2016
12V Power Amp

Hi all,

I couldn't find such a good & powerful (Transistor based) one without switching power supply that convert 12V to high voltage.

Any recommendation for IC based circuits? (TDA/LA/LM/AN series ICs)

The SMPS I have is from a HP server with 12V 8A capacity.

Regards,
Edison C.
 
A

AndrewT

R.I.P.
Joined 2004
edisonpc said:
What about TDA7850 ?

Anyone tried Class AB amplifier circuit operating from 12 volts, 10W, fully transistorized
Click to expand...
you seem to be completely unaware of the voltage limit on the output imposed by using a 12Vdc supply.

The maximum unclipped output voltage into a high impedance load is roughly 1/3rd of the supply voltage.
That gives your amplifier example a maximum output of ~4Vac.
When you load it with an 8ohms speaker you may find that the maximum voltage has dropped to 3.5Vac.
Power = 3.5Vac² / 8ohms = 1.5W
Use a 4ohms speaker and the max will drop even lower, maybe to 3Vac giving a power output ~ 1.1W
 
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