WWGC 3875 finally coming together

Wardsweb · 28th May 2006, 04:08 PM

Well, the Wardsweb Gainclone (WWGC) has been on the shelf for over a year, so I decided to work on it today. For those who don't remember a very long time ago, I'm using LM3875TF chips sampled from National Semiconductor, 6061 billet aluminum plate, 1" plexiglass, Parts Express transformer, heat sinks off Ebay and misc other parts I had laying around. So, after much cutting, drilling, tapping, sanding and fitting, it's all built now, just need to heat up the soldering iron and wire it.

I started a build page for it here: http://wardsweb.org/audio/gainclone.html

Wardsweb · 28th May 2006, 11:29 PM

Well it's all done. Makes for a nice simple amp with clean lines.

RCBandwidth · 29th May 2006, 01:02 AM

That really is a great looking amp you have put together.The Plexiglass must have taken a a good bit of work to get it to look like that.Now you just need a matching pre-amp!

Regards Bob C.

Wardsweb · 29th May 2006, 03:42 AM

Quote:

Originally posted by RCBandwidth
That really is a great looking amp you have put together.The Plexiglass must have taken a a good bit of work to get it to look like that.Now you just need a matching pre-amp!

Regards Bob C.

Thanks...the plexiglass was cut on my table saw, sanded on a oscillating table belt sander and trimmed using my router table. Then drilled with a press and hand tapped. Yes, a bit of work but no other way to get it done. The hardest part was the IEC cutout. Had to finish that by hand because the tolerance is tight.

Now pre...

ransom peek · 29th May 2006, 05:12 PM

Do you think it would be better to use shielded cable for the inputs?

Wardsweb · 29th May 2006, 08:26 PM

Quote:

Originally posted by ransom peek
Do you think it would be better to use shielded cable for the inputs?

The input cabling is plenum grade RG316 coax. With the shielded input and keeping the power close to the chassis, the amp is dead quiet.

ransom peek · 29th May 2006, 09:59 PM

Quote:

Originally posted by Wardsweb

The input cabling is plenum grade RG316 coax. With the shielded input and keeping the power close to the chassis, the amp is dead quiet.

Where does one find RG316 coax? That's the only thing now keeping me from finishing my amp...

Wardsweb · 29th May 2006, 10:54 PM

Quote:

Originally posted by ransom peek

Where does one find RG316 coax? That's the only thing now keeping me from finishing my amp...

Electronics shops, wire houses or even Ebay. The stuff shows up in short lengths and terminated cables on Ebay for a few dollars fairly often. You don't need very much usually.

Wardsweb · 6th June 2006, 08:26 PM

Took the little amp to an audio meet this past weekend and had some fun showing what can be done with it. Here it is using an iPod for a source driving some Klipsch KHorns.

bart_dood · 6th June 2006, 09:25 PM

How did it compare with the more pricey gear?

I am building a little 3875 to work with some tiny speakers (3" tang band) until the house renovations are done and I can get my pass labs pen zen out of storage etc.

28th May 2006, 04:08 PM	#1
Wardsweb diyAudio Member Join Date: Feb 2003 Location: San Antonio, Texas	WWGC 3875 finally coming together Well, the Wardsweb Gainclone (WWGC) has been on the shelf for over a year, so I decided to work on it today. For those who don't remember a very long time ago, I'm using LM3875TF chips sampled from National Semiconductor, 6061 billet aluminum plate, 1" plexiglass, Parts Express transformer, heat sinks off Ebay and misc other parts I had laying around. So, after much cutting, drilling, tapping, sanding and fitting, it's all built now, just need to heat up the soldering iron and wire it. I started a build page for it here: http://wardsweb.org/audio/gainclone.html

29th May 2006, 01:02 AM	#3
RCBandwidth diyAudio Member Join Date: May 2004 Location: New York and PA	Great Job That really is a great looking amp you have put together.The Plexiglass must have taken a a good bit of work to get it to look like that.Now you just need a matching pre-amp! Regards Bob C. __________________ One man's magic is another man's engineering.

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28th May 2006, 11:29 PM	#2
Wardsweb diyAudio Member Join Date: Feb 2003 Location: San Antonio, Texas	Well it's all done. Makes for a nice simple amp with clean lines.

29th May 2006, 05:12 PM	#5
ransom peek diyAudio Member Join Date: Nov 2003 Location: fort collins co	Do you think it would be better to use shielded cable for the inputs?

6th June 2006, 08:26 PM	#9
Wardsweb diyAudio Member Join Date: Feb 2003 Location: San Antonio, Texas	Took the little amp to an audio meet this past weekend and had some fun showing what can be done with it. Here it is using an iPod for a source driving some Klipsch KHorns.

6th June 2006, 09:25 PM	#10
bart_dood diyAudio Member Join Date: Dec 2003 Location: Massachusetts	How did it compare with the more pricey gear? I am building a little 3875 to work with some tiny speakers (3" tang band) until the house renovations are done and I can get my pass labs pen zen out of storage etc.

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