Fast GB: LM4702 high power amp test board ;) - diyAudio
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Old 10th May 2006, 02:13 PM   #1
veteran is offline veteran  Poland
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Cool Fast GB: LM4702 high power amp test board ;)

I ordered 30 boards for my LM4702 amplifier. This is a test version pcb to take a closer look to National new audio driver. I don't need about 15 of them so if You are interested - just let me know. One board will cost about 12$ - 150x60mm, through hole plated, double layer, about 100um copper.

I would like to start tests from some cheap output transistors like 2SD2390/2SB1560 or 2SD2560/2SB1647 and 2SK1529/2SJ200 mosfets. SAP16N/SAP16P are very interesting but they are hard to buy here.

Documentation:
amp sch

Click the image to open in full size.
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Old 10th May 2006, 08:46 PM   #2
dfdye is offline dfdye  United States
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Thanks for offering! I just ordered boards, so I am not in need, but there were a bunch of people who wanted an all-in-one solution with onboard transistors, so I am guessing you should get those sold off pretty quickly!

David
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Old 11th May 2006, 07:06 AM   #3
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What do You say for a trade dfdye (my board for Your board)? I would really like to start some test on LM4702
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Old 12th May 2006, 02:07 PM   #4
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I'm interested in the board, how do we go about purchasing? Can you offer a small volume discount if I buy a few? Are you interested in any trading of pcbs/chips?
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Old 12th May 2006, 03:37 PM   #5
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Elementx, I will contact You in a minute. Trading sounds good and about the price... we will talk about it
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Old 14th May 2006, 01:52 AM   #6
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Default dracula mosfet amp

My friend elementx was interested in the lm4702 pcbs,I was interested in the Dracula mosfet amp.Do you have a schematic for it that I could look at?
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Old 15th May 2006, 12:38 PM   #7
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Dracula was originally designed by Dariusz Kulesza. I added voltage regulators, supply and designed PCB for it. Schematic should reach your email box now
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Old 18th May 2006, 02:43 PM   #8
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Default dracula amp

What are the power supply rail voltage and why is the speaker not direct coupled.Could you tell me anything else about the amp
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Old 18th May 2006, 02:52 PM   #9
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Default lm4702

veteran,Have you built the lm4702 amp yet,I just got some chips but have not made a board yet.Is the sound quality as good or better the lm3875 or lm3886.I have used upc1225 as a driver IC in the past for sub amps.
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Old 18th May 2006, 02:56 PM   #10
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This was a test board. Capacitors protect speakers but amplifier sound much better without them Supply voltage is limited to maximum OPA552 voltage range or (if regulators will be mounted) to about (+)(-)40VDC.

No, not yet. I'm waiting for my boards to start some real tests.

GB is closed. Soon I will put some pictures of my amplifier.
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