Bridgeclone

BrianGT · 2004-03-31 4:08 pm

Aunkst said:
I think this is an excellent question. I don't have the printed boards, but just how easy is it to bridge two amps together?

I'm learning alot, but some of the finer details excape me at this point.

I would hold out on this project for now, unless you have access to lab equipment. I am going to go into lab within the next week, and prototype a bridgeclone with my boards, and the DRV134 chips (see above posts for some details). My initial assumption is that with matched components on the boards and a 0.22ohm output resistor, it should work fine with the DRV134 chip, but I will verify this in lab with a scope, and do some testing.

--
Brian

usekgb · 2004-03-31 4:14 pm

That's exactly what I was thinking Brian. As long as the components are well matched, it should work fine. I was planning on putting one together in this configuration sometime this week. I have a scope at work, and can check for oscillations. I'll have to let you know how it goes.

Cheers,
Zach

SQ Kid · 2004-03-31 5:05 pm

ok, i guess that pretty much answers my question. i wasnt sure if it was that easy (well, sorta), but i guess it seems its pretty possible if everything is pretty well matched. looks like i gotta get rid of those occasional radio shack resistors (gasp....i had messed up with one on each board...)

Aunkst · 2004-03-31 7:32 pm

BrianGT said:
I would hold out on this project for now, unless you have access to lab equipment. I--
Brian

Ahh, But I do have access to a good scope, (1st year EE student). lay some procedure on me,
youre' saying:
1. build both sides with matched components.
2. test each side independantly.
3. use resistors to set output current EQUAL.
4. use a DRV134 to split the phase and drive each side of the bridge.

sounds simple.

when I am scoping for oscillation, what would I look for?

BrianGT · 2004-03-31 11:12 pm

Aunkst said:
Ahh, But I do have access to a good scope, (1st year EE student). lay some procedure on me,
youre' saying:
1. build both sides with matched components.
2. test each side independantly.
3. use resistors to set output current EQUAL.
4. use a DRV134 to split the phase and drive each side of the bridge.

Sounds like you have it covered. I would just input a sinusoid from a functional generator and verify that you have a clean output, checking the gain, and the level of power output obtained under load.

--
Brian

Coulomb · 2004-04-01 1:57 am

BrianGT said:
Sounds like you have it covered. I would just input a sinusoid from a functional generator and verify that you have a clean output, checking the gain, and the level of power output obtained under load.

--
Brian

What kind of sine wave do you get from a Non Functional generator?

Anthony

Scribble · 2004-12-07 8:47 am

So did any of you guys get around to prototyping a bridge clone of sorts?

I have seen the BPA with 6 chip's and the PA100 floating around. Any others?

troystg · 2004-12-07 6:19 pm

taken back.

Svenhook · 2004-12-08 1:44 am

Hey, I decided on the LM3875 gainclone from this site.
http://stiftsbogtrykkeriet.dk/~mcs/LM3875/index.html

I was wondering if anyone had a parts list for it? Thanks
-Steve

jackinnj · 2004-12-08 2:36 am

if you are going to build this, don't attempt Vectorboard, you definitely need a PCB (the pins themselves are only 20 mils, the spacing is quite compact):