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Old 19th February 2008, 05:44 AM   #1
N9VOC is offline N9VOC  United States
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Cool Favorite Practice/small group amp

Attached is a schematic of my favorite DIY guitar "practice" amplifier. I call it the "Classy Lassy" because the enclosure is made from recycled lumber and the speakers harvested out of "junk" equipment.

The 5 Mohm input impedance doesn load my guitar (piezo or inductive pickups) and the amp also makes a portable radio sound GOOD! I did not want high power, but good sound quality for this amp, thus the LM386-4 based designs.

As noted on the schematic, my hat's off to Runoffgroove.com for their "Ruby" design.

Photos of completed amplifier to follow in another post.

(originally posted in "chip amps" but suggested to be posted here.)
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File Type: pdf classyt.pdf (36.6 KB, 129 views)
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Old 19th February 2008, 05:48 AM   #2
N9VOC is offline N9VOC  United States
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Cool Classy Pic

Attached is a photo of the Classy Lassy.
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File Type: jpg lass1.jpg (52.7 KB, 270 views)
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Old 19th February 2008, 09:14 AM   #3
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Wow, beautiful amp !
Any chance of sound samples ?
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Old 19th February 2008, 11:09 PM   #4
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Quote:
Originally posted by Andronico
Wow, beautiful amp !
Any chance of sound samples ?
Thanks!
I'll work on the sound samples, not set up to record at this time -- when I get them, I'll post em here
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Old 23rd January 2009, 01:27 PM   #5
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Yeah, I like it. Also 'cause it resembles my own designs: recycled lumber and parts harvested from electronic junk. What about photo's from the interior?
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Old 25th January 2009, 06:19 PM   #6
N9VOC is offline N9VOC  United States
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Cool interior of classy lassy

Bassbuddy,
picture #1 of the interior - at the top

n9VOC
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File Type: jpg classin1.jpg (80.7 KB, 149 views)
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Old 25th January 2009, 06:22 PM   #7
N9VOC is offline N9VOC  United States
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Default Classy interior #2

And here is the interior "bottom"
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File Type: jpg classin2.jpg (87.5 KB, 143 views)
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Old 25th January 2009, 06:27 PM   #8
N9VOC is offline N9VOC  United States
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Cool Classy Interior #3

Here is another shot of the interior bottom, showing the twin duplex recepticles I installed on the back panel.

I used a "closed and ported" box design for this, and it seems to work well.

I use a "hot glue" gun to tie down my wires where I want them to be tied.

I do have an issue of a slight amount of 120 Hz "buzz" when the the system volume is turned up with no signal in - but that could be rectified through some judicious cable shielding and routing.

For my use - as a "living room" style practice amp, I just don't worry about the small buzz - it is low enough that I only hear it when all is silent around me.

I hope you like it!

n9VOC
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Old 26th January 2009, 01:34 AM   #9
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Hi, I like it.
It is a true unique work of art. No redundant things like "nice" silk-screen-covered-PCB's, which would imply serial production. And honest woodwork.

Here's a picture of one of my projects, that did unfortunately not survive. It's intestines have never been photographed, what a shame. There was a 2xEL84 amp inside of which the power transformer went up in smoke. After that the power amp was a TDA1519 from some car radio. Now the cabinet is standing in my garage for some future project. Here is a photo from the front side.

Bassbuddy
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Old 26th January 2009, 01:34 AM   #10
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And this is the rear side with a line output
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