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Old 18th December 2009, 05:59 PM   #1281
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Aleš, That's a great looking build is the chassis off the shelf?
Dave
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Old 18th December 2009, 06:03 PM   #1282
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Quote:
Originally Posted by mravlca View Post
Hi!
Here is my implementation of LM3886. You are wondering why cooler is on the bottom side, well the amp will be runnig on +-24V so it will be barely warm.

Regards Aleš
Very nice

Why not just turn the whole chassis over?

Do you have inductor on output, if so what rating and why?

What is your power supply?

Im interested in those boards. Can you post a URL giving more information on these Redshift187 boards please.

Thanks
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Old 18th December 2009, 06:21 PM   #1283
mravlca is offline mravlca  Slovenia
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@DynacoDave: Yes that one is off the shelf, it's from fisher elektronic, model EUG13.

@mikesnowdon: Well I prefer the look this way, if there will be need for colling I will turn it upside down. I have inductor on the output, I don't know the rating because it's from an old Sherwood amp. I put it there just to slightly soften the sound, but I must say that I haven't noticed any difference with it or without it.

LM3886 Servo Design
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Old 18th December 2009, 07:26 PM   #1284
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Quote:
Originally Posted by mravlca View Post
@DynacoDave: Yes that one is off the shelf, it's from fisher elektronic, model EUG13.

@mikesnowdon: Well I prefer the look this way, if there will be need for colling I will turn it upside down. I have inductor on the output, I don't know the rating because it's from an old Sherwood amp. I put it there just to slightly soften the sound, but I must say that I haven't noticed any difference with it or without it.

LM3886 Servo Design
Ahh ok.

More generally inductors are put in the output to keep the amp stable with differing cable lengths and/or properties. Purists will shun the idea of en extra component in the signal path but a good air core inductor shouldn't have any negative effects on the sound quality. Its a great build. I really like it

Thanks or the link
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Old 19th December 2009, 01:31 AM   #1285
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A few more photos. I used bakelite knobs from an old 1040's radio that has a crushed housing. Not much golf car work to do today in the snow.
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Old 19th December 2009, 02:02 AM   #1286
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Default Arjen MKIII TA2020 fits nicely in a cigar box.

I think my first post was killed by the snow storm. Well anyway.

This is a Arjen Helder MKIII TA2020 board and power supply that I have been working on today while the snow is comming down. I have a tube buffer amp that goes with it but I haven't built it out yet. I can't decide if I should just put it in the signal path between the pot and the selector or build it as a stand alone component between the amp and a cd player? I put an extra 12v plug on the power supply just in case I do the second.

Pardon the Cuban cigar box that I found at Goodwill (and I'm sticking to this story). The box is nice in that it says 25 Robustos on the side which is the rated watts for this amp approx.

I am starting to like the sound of this amp now that the shrillness of the new caps are fading. I almost don't miss my regular amp, ST-70 with VTA mod.
I think I will eventually change out the output caps and could use a suggestion for that (although I think these stock red caps are really not that bad).

For power supply housing I just used an old projcct box from a yard sale box full of 1940s' toy train table parts. Notice the glass lights and switches. The copper accents are from the back plate of an Akai M-8 reel to reel that was gutted for a mono amp project last year.

Happy Holidays and enjoy the snow.

Ashevillebob
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Old 19th December 2009, 02:55 AM   #1287
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Quote:
Originally Posted by ashevillebob View Post
Not much golf car work to do today in the snow.

Tell me about it....Arden here. 9" snow last time I measured.
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Old 19th December 2009, 02:55 AM   #1288
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OOOPS! I've posted in the wrong photo gallery (needs to be in Class D gallery) and I've more or less double posted in both to boot. Too much wiring and solder fumes today I guess.
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Old 19th December 2009, 02:58 AM   #1289
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Thump Lump,
Haw Creek is up to 12 1/2 " on the picnic table out back. My daughter has been giving me hourly readings with a yard stick. Good thing it's Saturday tomorrow.

Last edited by ashevillebob; 19th December 2009 at 03:04 AM.
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Old 19th December 2009, 06:54 AM   #1290
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Hello Asheville neighbor,


We are up to 16 inches here near Boone, NC.

Nice work on your gainclone.

Best,
Anand.
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