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Chip Amps Amplifiers based on integrated circuits

Bridgeclone
Bridgeclone
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Old 8th December 2004, 05:40 PM   #131
jackinnj is offline jackinnj  United States
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Default populated board

here's the board -- with humongous PP caps:

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Old 9th December 2004, 04:36 PM   #132
Scribble is offline Scribble  Australia
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Looking good.

Tell us how it performs
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Old 24th February 2005, 08:28 PM   #133
jackinnj is offline jackinnj  United States
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they just arrived so I wired one up:
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Old 24th February 2005, 09:57 PM   #134
jackinnj is offline jackinnj  United States
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distortion at10W, 1kHz = 0.0014%,
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Old 24th February 2005, 11:30 PM   #135
jackinnj is offline jackinnj  United States
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here's a graph of the proto-Bridgeclone and the newer version --
Click the image to open in full size.

changes -- the snubber resistors were changed to 5.6R from 2.7R, the layout is a little cleaner -- the power supply for both test amplifiers were identical. the distortion at 1kHz was 0.0019%, up a tad from the first run.
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Old 25th February 2005, 04:23 PM   #136
jackinnj is offline jackinnj  United States
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What is abundantly clear after testing this amplifier at 100 watts is that you can't kid around with the heatsinking of the chip in the bridged version. Machine screws are not sufficient to get the best contact between the chip and heatsink -- you have to use a fixture which compresses the chip against the sink and thermal grease.
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Old 27th February 2005, 06:38 PM   #137
mwmkravchenko is offline mwmkravchenko  Canada
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Default Care to Share your board design??

jackinnj would you consider posting your pcb design so that I (we) could give it a shot?

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Old 28th February 2005, 02:19 AM   #138
jackinnj is offline jackinnj  United States
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the schematic follows the National Semi design, and the PCB design follow this -- from the hints that they give you on their zipped files and the pictures of the finished board you should be able to do it pretty quickly -- if you want to roll your own remember that the size of the LM4780's pins are 21 mils. I put a power plane on the bottom and ran the power leads at (I think) 200 mils.
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Old 1st April 2005, 07:53 AM   #139
Menno Keizer is offline Menno Keizer  Europe
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Default Ballanced bridge clone

I have some designing problems with mij bridge clone,
I`am using a jensen JT-11p-1 input transformer as a buffer.
which drives (+ and -) a total of 4 non-inverted lm3886`s

can the scematic (pic) be used as it is?

what resistor values do i need for best impendance matching?

R1= 1K?(riken ohm)

What resistor values for R2,R3? (22k , 680R vishay s102)

My powersupply wil be a 2X22v= 500va torroid

R4=0,22ohm dale


Maybe Kuei Yang Wang can help me on the trafo thing......



Menno
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