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Old 12th January 2006, 10:10 PM   #11
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Jason, Just to make sure I understand you correctly...

I will be taking 2 stereo amps wired in parallel which makes them two mono amps. Then I am going to use the DRV164 to bridge these mono amps according to you I think.

Is that what you are saying I can do??

Or are you just referring to a chip that bridges the stereo amp into a mono ONLY???

Thanks again,
Dominick
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Old 13th January 2006, 03:38 AM   #12
sangram is offline sangram  India
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Don't worry about some having 16 pins and some having 8. Internally they're exactly the same, execpt the surface mount chips are a little bigger for heat reasons since the DRV134 drives quite a heavy load. Surface mount packages usualy can dissipate less heat than their DIP counterparts, so an increase in area may have been needed to keep it within safe limits at short-circuit or full load conditions. The internal circuitry is the same, and there will be a lot of unconnected pins. So don't worry, use whatever you like.

The way it works is that almost all sources output voltage in one 'Direction' only, with reference to ground. For an amp to be bridged the two amplifiers need to see opposing voltages, so one amp is driven negative when the other is driven positive. The total voltage across the load then becomes twice the input signal + the amp gain.

The DRV134 takes an input signal, adds 6dB of gain, then supplies two outputs, one with the positive signal the other with negative signal (inverse polarity). Then these two outputs need to be connected the two amps, and the speaker connected to the output live terminals of the two amps (+ and + spkr outputs to + and - of the speaker). The speaker will not be connected to the ground at any time.

I'm using this scheme right now (as I said, I'm not using a DRV134 yet but am in the process, meantime using my soundcard with balanced output) and it works fine!
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Old 19th January 2006, 08:16 PM   #13
jasonva is offline jasonva  United States
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Quote:
Originally posted by Dominick22
Jason, Just to make sure I understand you correctly...

I will be taking 2 stereo amps wired in parallel which makes them two mono amps. Then I am going to use the DRV164 to bridge these mono amps according to you I think.

Is that what you are saying I can do??

Or are you just referring to a chip that bridges the stereo amp into a mono ONLY???

Thanks again,
Dominick
If you do that you will be making one BIG mono amp, which is what I did with my 4 chip gainclone. 4 outputs, .22 ohm resistor on each positive output to force power sharing. now tie two outputs and inputs together. this results in two paralleled amps. now drive these two amps with ONE DRV 134.

on the other hand, if you just want two bridged amps, just drive each amp with a DRV 134.

Look at the BPA 200 and 300 threads for details.
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