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Old 29th August 2007, 01:31 PM   #461
SM7UYJ is offline SM7UYJ  Sweden
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Gain Clone with LM1875

Inputs selectable via push button on front panel - switching + memory function using 16F629 PIC.

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/R
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Old 31st August 2007, 11:07 AM   #462
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LM4780TA..

Home made PCB:

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AMP:

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Some modifications:

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Old 1st September 2007, 01:11 AM   #463
sukyone is offline sukyone  Thailand
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sorry for non picture
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Old 1st September 2007, 01:12 AM   #464
sukyone is offline sukyone  Thailand
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PCB And LM3886 Chip
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Old 1st September 2007, 01:16 AM   #465
sukyone is offline sukyone  Thailand
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Tone control import from Chaina
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Old 1st September 2007, 03:31 PM   #466
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My latest and best so far. Three LM3886s in parallel per channel with PSU on the same board. Board size is 100mm by 100mm for the lot (mono). Just connect a transformer, input and output and you're off :-)

I am really proud of it because it works with minimal grounding effort, no hum or buzz to be heard and only a very faint hiss from less than 1cm away.

No case yet. That's the next thing. It's going to be made out of real wood though. I'm getting help with it, because I am useless with power tools I've also got a PIC controlled push button (made to switch a relay on and off) to go with it, with a fading power LED (ring around the power button).

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Yay or Nay?
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Old 1st September 2007, 04:24 PM   #467
wim is offline wim  Netherlands
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Very, very nice work markiemrboo !!

How does it sound?
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Old 1st September 2007, 04:34 PM   #468
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Great stuff Markiemrboo - surely a YAY for construction.

Please provide your impression after listening tests.

Do you plan to publish/share the board construction files? Please?

Cheers,

LS
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Old 1st September 2007, 04:47 PM   #469
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Quote:
Originally posted by wim
Very, very nice work markiemrboo !!

How does it sound?
Thanks wim!

I'm just testing it at the moment to make sure nothing bad happens. They are my old speakers, 4 ohm nominal Eltax Monitor IIIs. It seems to drive them very well indeed though. The rectifiers stay stone cold, the heatsink gets fairly hot, but I can keep my hand on it for 10 seconds+ pretty easy.

I seem to remember that using these speakers with my current amp (regulated single LM3886) and old Cambridge Audio A5 on particularly bassy tracks the woofer would give up and start making clunky noises. With this amp it seems to behave much better with the same tracks. Obviously the poor little woofer still has it's limits though.


Quote:
Originally posted by dudaindc
Great stuff Markiemrboo - surely a YAY for construction.

Please provide your impression after listening tests.

Do you plan to publish/share the board construction files? Please?

Cheers,

LS
Thanks dudaindc!

I will try. I am really not good at describing sound though. I probably also need to calm down a bit. I am so excited that it's working so amazingly well, and is so neat compared to previous attempts I can't turn it off. I set out to test it for an hour and it's been on all day!

I will post the layout soon. I've got a fair bit on my plate at the moment so it won't be instantly! It's oriented towards home made PCB construction though, with blobs of trace around smaller holes (i.e small resistors) so that drilling doesn't lift the traces as easily. I'm not sure how well the layout will work when sent off to a pro place either. Maybe someone can give hints when I eventually post it
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Old 1st September 2007, 11:02 PM   #470
BWRX is offline BWRX  United States
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Nice batch of amplifiers recently posted. Good work guys!
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