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Old 26th December 2008, 05:09 AM   #851
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Default Finished first amp project

This is my very first diy hifi - Peter Daniel LM3875 dual mono kit with Nuvotem trannies. Sound fantastic with my (unfinished) FE207e MLTLs. Source is a squeezebox duet into Cambridge Dacmagic.

Case work was a bit of make it up as you go along. Heatsinks taken from two old PC cpus and alu plate bought from local locksmiths. Cardas posts were a little indulgent, but everything else cost peanuts.

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Cheers
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Old 27th December 2008, 09:15 AM   #852
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Default Re: Finished first amp project

Quote:
Originally posted by afunkymonk
Case work was a bit of make it up as you go along.
...which makes the very nice result even more admirable.

Where is the power switch?
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Old 27th December 2008, 10:31 AM   #853
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Default Re: Re: Finished first amp project

Quote:
Originally posted by pacificblue



Where is the power switch?
At the plug, with the fuse...

Have left room at the front of the case for power switch, led or volume pot, whichever (if any) become necessary.
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Old 28th December 2008, 04:02 PM   #854
ide2003 is offline ide2003  Indonesia
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Default Re: Finished first amp project

Quote:
Originally posted by afunkymonk
This is my very first diy hifi - Peter Daniel LM3875 dual mono kit with Nuvotem trannies. Sound fantastic with my (unfinished) FE207e MLTLs. Source is a squeezebox duet into Cambridge Dacmagic.

Case work was a bit of make it up as you go along. Heatsinks taken from two old PC cpus and alu plate bought from local locksmiths. Cardas posts were a little indulgent, but everything else cost peanuts.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Cheers

hmm..always liked Peter D design..also loves your 'white ' speaker driver..congrats
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Old 2nd January 2009, 04:55 AM   #855
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Default ChipAmp monoblocks

Been meaning to post these for a while. They sound great thanks to BrianGT and some transformers from Nelson Pass at Burning Amp 2007.

Here's the inside guts.
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File Type: jpg imgp1843.jpg (48.0 KB, 2610 views)
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Old 2nd January 2009, 05:02 AM   #856
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Default ChipAmp monoblocks

In use, at my old Apt.
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Old 3rd January 2009, 04:33 PM   #857
ide2003 is offline ide2003  Indonesia
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nice copper works, I wish one for my next project, did you bend the sheet your self?

TPS
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Old 6th January 2009, 10:05 PM   #858
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hehe, it's actually aluminum case with hammered copper spray paint. :-D
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Old 7th January 2009, 02:46 PM   #859
ide2003 is offline ide2003  Indonesia
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upss..you've got me there billy!..
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Old 11th January 2009, 03:23 PM   #860
Beftus is offline Beftus  Netherlands
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Here's my first ever chip amp using the PCBs from BrianGT (chipamp.com). I finished both monoblocks yesterday. They sound great, a wide and detailed soundstage. Much to the dismay of my wife I can hear the difference to my Cambridge Audio 540A amp...

The design is far from original, I've seen more people use these aluminium enclosures, but I really like their look.

Specs:

- 2x Amplimo toroids 2x22V 80VA
- all 0.1 uF caps Vishay-Roederstein MKP1837
- all electrolytics from Panasonic (FC and TS)
- MUR820 rectifier diodes (couldn't find 860's locally)
- all resistors are metal film types

I hooked up the PSU and amp boards using 0.6mm (approx. AWG 23) solid core wire. For the signal output I used 1.4mm (approx. AWG 15) solid core wire.

Measurements taken after completion:
- DC rail voltages left & right channel: 30.3V & 30.8V
- DC offset left & right channel: 1mV & 0.4mV (may not be very accurate, measured with a dirt cheap DMM)

I may improve the aesthetics by replacing the front plate with a piece of wood (oil finished oak from a leftover piece of floorboard). To improve the WAF there's not gonna be a power LED.

WRT the rail voltages, do I need to worry about the little difference? DC offsets appears to be very low, I might check DC offsets again with a real DMM.

Next project will be a matching passive preamp/source selector. At the moment I use the preamp out of the 540A amp.
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