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Old 22nd August 2003, 02:41 AM   #1
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Default p2p gainclone layout

Here are my first p2p layout using a LM3875.
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Old 22nd August 2003, 02:42 AM   #2
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...and here is my second using a LM1875.
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Old 22nd August 2003, 02:56 AM   #3
jleaman is offline jleaman  Belgium
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very nice.. i like them. Do you run a isp?
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Old 22nd August 2003, 03:24 AM   #4
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Is that copper wire you are using?
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Old 22nd August 2003, 03:25 AM   #5
aiwonsi is offline aiwonsi  Thailand
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what scheme you use for LM1875
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Old 22nd August 2003, 03:44 AM   #6
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Thanks

JasonL: not sure what you mean by isp.

mFinalHeaven: I used enamelled copper wire that were offcuts from the toroids and a little bit (20mm) of cat5 for the signal wiring.

aiwonsi: I used the Peter Daniel's minimalist IGC schematic. 2 filter caps, 1 input cap, 2 feedback resistors but I used a 100K resistor across the input instead of a pot. Both use the identical circuit.
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Old 22nd August 2003, 03:46 AM   #7
jleaman is offline jleaman  Belgium
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sorry greg. as i was reading your top blurb it to me was sounding like you were running your own isp sorry ( internet service provider )
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Old 22nd August 2003, 03:51 AM   #8
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No problem.

Oooh that isp. I thought it must have something to do with a GC PSU.
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Old 22nd August 2003, 06:17 AM   #9
Raka is offline Raka  Europe
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What about the psu? (and the sound, of course)
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Old 22nd August 2003, 06:51 AM   #10
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Hi Raka,

I'm not using a GC type PSU yet so it is a little premature to judge the sound quality and to be honest I think I may have LEAD ears anyway.

I'm using my test PSU, which is a 2x12VAC 300VA, a bridge and 2x10,000uf filter caps. This gives about only 17-0-17VDC.

What I am suprised about is;

1. with only 17 volts these amps generates more than adequate volume on my inefficent speakers.

2. the difference between the LM1875 and LM3875TF is surprising small. I was expecting chalk and cheese. The LM3875TF may have a little more guts.

3. the LM1875 seems to heat up the heatsink quicker than LM3875.

I rotate between 3 GC amps at the moment and here is my preferences, although, the differences to my ears are minute and I am happy listening to all of them.

1. LM3875 IGC
2. LM1875 IGC
3. LM1875 non-inverted GC

Even in there present state these amps sound better than my old Yamaha, but that not surprising to us DIYers,
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