My LM1875 gainclone... point2point... - diyAudio
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Old 19th March 2005, 05:35 PM   #1
w00t is offline w00t  Singapore
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Default My LM1875 gainclone... point2point...

Finally got down to doing my gainclone... Everything used are spareparts leftover from previous projects...

Resistors:
Zobel uses 5W Dale 1% NS-5.
Carbon 5% used between ground and earth, and for LED.
Everything else 1% metal films.

Capacitors:
4.7uF Blackgate-N for input dc blocking.
Wima 0.22uF MKP for zobel.
Nichicon Muse 1000uF per rail per chip for PS filtering.
1uF MKS used across both rails, soldered directly onto chip.
0.1uF used between ground and earth.
0.1uF Rifa X2 used as snubber caps.

200VA 18-0-18 toroidal trannie used. Rectification by ON Semi MUR860. Binding posts are all WBT clones. Heatsink is oversized for this application... Hardly gets warmed up.

On with the pictures...
(Ignore the Earth wire around the binding posts... it's there to add 'thickness' so that the binding posts can be mounted properly)

Right channel done... Left channel half done...
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Old 19th March 2005, 05:37 PM   #2
w00t is offline w00t  Singapore
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Closer view of the Right channel... Took great pains to solder it 'star'...
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Old 19th March 2005, 05:38 PM   #3
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Both channels wired up to the power source...
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Old 19th March 2005, 05:39 PM   #4
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Another view...
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Old 19th March 2005, 05:40 PM   #5
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The rectifier board... Check out the wires converging at the DC side...

I have no uniform wire color code for different voltages...
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Old 19th March 2005, 05:42 PM   #6
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Overall view...
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Old 19th March 2005, 05:43 PM   #7
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Back view... the WBT clones, 2 RCAs, a fuse holder (hardly visible) and the IEC (hardly visible as well)
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Old 19th March 2005, 05:44 PM   #8
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Testing in progress...

That's all! Comments?
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Old 19th March 2005, 06:30 PM   #9
MBK is offline MBK  Singapore
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That's great, your soldering work looks as messy as mine (and do I recognize Sim Lim prototyping boards?).

Not to worry too much, the electrons don't care. But do check out safety, sometimes without the "anchor" of a board, and with thick connecting wires, things can get bent into a short, with those tight spaces. I have made this kind of mistake several times...

Have fun and enjoy,
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Old 19th March 2005, 07:11 PM   #10
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Hi there - how does the amp sound, and what speakers are you using with it?

I also noticed that in post #3, the top of one of your supply caps looks VERY close to touching the tab of one of the rectifirer diodes. I'd look at that if I were you.
(I think the metal casing of most el. caps is connected on of the terminals..)
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