Fast GB: LM4702 high power amp test board ;)

veteran · 10th May 2006, 01:13 PM

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

dfdye · 10th May 2006, 07:46 PM

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

veteran · 11th May 2006, 06:06 AM

What do You say for a trade dfdye (my board for Your board)? I would really like to start some test on LM4702

elementx · 12th May 2006, 01:07 PM

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?

veteran · 12th May 2006, 02:37 PM

Elementx, I will contact You in a minute. Trading sounds good and about the price... we will talk about it

steven344 · 14th May 2006, 12:52 AM

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?

veteran · 15th May 2006, 11:38 AM

Dracula was originally designed by Dariusz Kulesza. I added voltage regulators, supply and designed PCB for it. Schematic should reach your email box now

steven344 · 18th May 2006, 01:43 PM

What are the power supply rail voltage and why is the speaker not direct coupled.Could you tell me anything else about the amp

steven344 · 18th May 2006, 01:52 PM

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.

veteran · 18th May 2006, 01:56 PM

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.

10th May 2006, 01:13 PM	#1
veteran diyAudio Member Join Date: Feb 2004 Location: Poland	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 __________________ Simple audio solutions blog.unisonus.com

11th May 2006, 06:06 AM	#3
veteran diyAudio Member Join Date: Feb 2004 Location: Poland	What do You say for a trade dfdye (my board for Your board)? I would really like to start some test on LM4702 __________________ Simple audio solutions blog.unisonus.com

12th May 2006, 02:37 PM	#5
veteran diyAudio Member Join Date: Feb 2004 Location: Poland	Elementx, I will contact You in a minute. Trading sounds good and about the price... we will talk about it __________________ Simple audio solutions blog.unisonus.com

14th May 2006, 12:52 AM	#6
steven344 diyAudio Member Join Date: Jun 2005 Location: ohio	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?

15th May 2006, 11:38 AM	#7
veteran diyAudio Member Join Date: Feb 2004 Location: Poland	Dracula was originally designed by Dariusz Kulesza. I added voltage regulators, supply and designed PCB for it. Schematic should reach your email box now __________________ Simple audio solutions blog.unisonus.com


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10th May 2006, 07:46 PM	#2
dfdye diyAudio Member Join Date: Dec 2005 Location: USA	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

12th May 2006, 01:07 PM	#4
elementx diyAudio Member Join Date: Jul 2005 Location: cleveland, ohio	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?

18th May 2006, 01:43 PM	#8
steven344 diyAudio Member Join Date: Jun 2005 Location: ohio	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

18th May 2006, 01:52 PM	#9
steven344 diyAudio Member Join Date: Jun 2005 Location: ohio	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.

18th May 2006, 01:56 PM	#10
veteran diyAudio Member Join Date: Feb 2004 Location: Poland	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. __________________ Simple audio solutions blog.unisonus.com

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