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-   -   increasing power of Focal car amplifier (http://www.diyaudio.com/forums/car-audio/214705-increasing-power-focal-car-amplifier.html)

muddasirwaheedmalik 18th June 2012 03:00 PM

increasing power of Focal car amplifier
 
hi.
I have a focal 4.75 car amplifier its a nice sounding 75 watt per channel amplifier.

Output devices TIP35/36C pair. Driver stage TIP 102/107.

Now i have made a separate power supply, 12v to +/- 40 Volts at 250 KHZ switching using 15 75N75 devices. its approxiVmately 1200W supply.


Now how can i use TIP 35/36C pair to drive 10 pairs of Parallel 2SC5200/SA4913 high biased to get around 150 W Class A to drive fronts of my car audio.

Using 10 pairs each device would be biased to dissipate around 30W.

Any schematic how to get drive signal from emitters of the output stage of the amplifier,

1. I assume i have to disconnect the emitters to ground and insert a 5K resistor to ground (to complete feed back path with additional 5k feed back resitance)

2. I then intend to bias the 5200/4913 pair with IC=2 Ampere ? any suggestions here ??? the load is 4 ohm, what should be the emitter resistior value and what should be the base resistor value for each device. ?

Thanks

Osvaldo de Banfield 18th June 2012 05:45 PM

Before make such a mod, buy a good battery charger, and replace the alternator with one for an aeroplane.

theAnonymous1 18th June 2012 09:18 PM

150W Class-A per channel? That's >600W of constant power draw from the electrical system.... good luck with that.

JLH 19th June 2012 04:18 AM

Quote:

Originally Posted by theAnonymous1 (Post 3064231)
150W Class-A per channel? That's >600W of constant power draw from the electrical system.... good luck with that.

Not to mention it will make for a very big space heater. I hope you have good air conditioning.

muddasirwaheedmalik 19th June 2012 11:54 AM

Ok , any suggestions about 50W Class A ?

regards.

Perry Babin 19th June 2012 03:27 PM

Why do you want a class A amplifier? A properly designed class B or class AB amplifier will produce clean audio (inaudible distortion levels).


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