LM1875 Amp, Arduino, Relay Attenuator in nice Alu Case - diyAudio
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Old 27th April 2011, 09:49 PM   #1
maxw is offline maxw  United Kingdom
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Default LM1875 Amp, Arduino, Relay Attenuator in nice Alu Case

I knocked this together to test my relay attenuator a while back and really don't have a use for it so I'd like to move it on. All parts are brand new and have less than 5 hours use. It consists of the following:

Chipamp.com LM1875 Amp and PSU modules. Upgraded PSU caps too. Details here:
DIY Chip Amplifier Kits, PCB's, Components and Information.

80VA encapulated toroid transformer (2x 18V), details here:
MULTICOMP|MCFE080/18|TRANSFORMER, 80VA, 2 X 18V | Farnell United Kingdom

Aluminium Case with recessed alu knob and power switch, quality RCA and speaker terminals

Arduino Duemilanove

Mini variable regulator module for the Arduino and relay attenuator

I2C controlled relay attenuator with 127 Steps + Mute. White PCB version, details here:
My Preamp Project: Arduino, I2C, relay selector+attenuator, tube stage

It all works well and is good to go. You could use it as is or break it up in to a preamp and a power amp or just use the parts elsewhere. I will mention that if you are using low sensitivity speakers you may want to up the gain. The LM1875 has some turn-off pop, nothing major but could do with a relay on the output if it bothers you.

The parts cost me about 200 all together, make me an offer, I just want it to go to a good home

Or I'll split it up if there is interest.

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Old 3rd May 2011, 10:44 AM   #2
maxw is offline maxw  United Kingdom
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Old 3rd May 2011, 03:34 PM   #3
phresh is offline phresh  United Kingdom
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Are you interested in any trades?
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Old 3rd May 2011, 03:35 PM   #4
maxw is offline maxw  United Kingdom
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Originally Posted by phresh View Post
Are you interested in any trades?
Maybe, what you got?
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Old 3rd May 2011, 04:08 PM   #5
phresh is offline phresh  United Kingdom
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Some of this stuff is up on PFM if you're on there but I haven't got any finished good per se.

I'e got;

1 x FE207e (excellent condition, probably not even run in)
1 x Visaton KE25SC Tweeter
1 x Full width enclosure that is being 'decomissioned' this week - needs a back panel to finish though.

I've got a few transformers (120VA - 1 x 12V, 300VA 2 x 35V and 225VA 2 x 18V)

I've also got a Modushop case with non-working LM3886 amp that I suspect has a problem with the amp boards as the power supply lights up fine.

Also have some Furutech phono connectors.

I expect none of this will be of any use but worth a try!
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Old 3rd May 2011, 07:46 PM   #6
maxw is offline maxw  United Kingdom
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Quote:
Originally Posted by phresh View Post
Some of this stuff is up on PFM if you're on there but I haven't got any finished good per se.

I'e got;

1 x FE207e (excellent condition, probably not even run in)
1 x Visaton KE25SC Tweeter
1 x Full width enclosure that is being 'decomissioned' this week - needs a back panel to finish though.

I've got a few transformers (120VA - 1 x 12V, 300VA 2 x 35V and 225VA 2 x 18V)

I've also got a Modushop case with non-working LM3886 amp that I suspect has a problem with the amp boards as the power supply lights up fine.

Also have some Furutech phono connectors.

I expect none of this will be of any use but worth a try!
Worth a try buy I'm afraid none of those items really fit in with my current projects
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Old 4th May 2011, 12:50 AM   #7
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Nice build. Where did you get the case? I could use one for my dcb1 buffer.
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Old 4th May 2011, 09:59 AM   #8
maxw is offline maxw  United Kingdom
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Originally Posted by merlin2069er View Post
Nice build. Where did you get the case? I could use one for my dcb1 buffer.
I got it from eBay a while back. Sorry I don't have a link but I'm sure you can search for it.
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Old 5th May 2011, 12:35 AM   #9
badman is offline badman  United States
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Quote:
Originally Posted by maxw View Post
Worth a try buy I'm afraid none of those items really fit in with my current projects
Any idea what MIGHT fit your needs? I can trade you a pair of UCD400 modules, unused?
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Old 5th May 2011, 01:15 PM   #10
maxw is offline maxw  United Kingdom
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Quote:
Originally Posted by badman View Post
Any idea what MIGHT fit your needs? I can trade you a pair of UCD400 modules, unused?
I'm only really working on a preamp at the moment. I'd be interested in a high end alu enclosure, alu knobs and quality RCA sockets. Sorry its very specific

I'm happy to split it up if people are interested.
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