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Old 8th September 2009, 11:23 AM   #1
poople is offline poople  Australia
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Default A nice warm 15W class A

Hello,

A few pictures of a little something I have been working on. It now works too, which is a real bonus - just needs a lid and some sides.

Based on the Silicon Chip 15W design of about 10 years ago. Everything has been upgraded (especially heatsinks) it is probably good for 18-20W.

Monoblock with separate power supply for each channel.

I was hoping this would cure my nasty case of DIY-itis, but it seems to have only made things worse....
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Old 8th September 2009, 01:19 PM   #2
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Default Can you provide schematic of sketch for us?

You unit is nice... well built.... very nice.

wanna share with us?

regards,

Carlos
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Old 8th September 2009, 05:18 PM   #3
Bigun is offline Bigun  Canada
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Great looking construction, very neat and tidy. The regulated PSU is a sight to behold, a good use of multiple parallel capacitors for low ESR etc.

I'm working on a simple Zen-type DIY design and your photos give me some inspiration - can you post more details (or is this commercial 'Owl Audio' pcb ?)
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Last edited by Bigun; 8th September 2009 at 05:23 PM.
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Old 8th September 2009, 08:38 PM   #4
poople is offline poople  Australia
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Owl Audio is something I wanted to take places - realistically I don't think it will ever leave my workshop! I think staying really small is the best way to make sure DIY is still fun....I don't really have the technical know how to design from scratch - hence the SC base.

A couple of details on the project -

Power supply PCB is 3oz single sided;
2 x 120VA toroids per channel each with a mains filter;
Rectifiers are ordinary slow types with 1nF snubbers;
24 x Panasonic 2700uF bypassed with 8 x Solen 0.1uF for main capacitance and
LM317 and LM337 regulators on lots of heatsinking.

Amplifier - PCB is 2oz double sided, star earthed;
RCA andbinding posts are Vampire;
Input cap is 3.3uF Solen SB;
Input filter and feedback network resistor are bulk foil;
Feedback capcitor is bi-polar black gate;
Quiescent current trimmer is a stupidly expensive bulk foil unit;
2 x 4700uF Cerafines to boost filter caps on each amplifier;
Rubycon ZLH filter caps on the board, bypassed with WIMA,
Other resitors are Welwynn RC55 0.05%;
Small signal transitors are BC550 and BC560 all matched to <1% and
Driver transitors are Sanken 2SA1494 and 2SC3858.

Sounds good too.
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Old 8th September 2009, 09:00 PM   #5
Bigun is offline Bigun  Canada
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Well, if you decide to 'go for it' with Owl Audio I for one wish you the best - you never know where it might lead.

It looks nice enough to be finished with a transparent lid
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Old 8th September 2009, 09:17 PM   #6
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Default I see.... it seems i already have these class A amplifiers

I have schematic.

thanks anyway.

regards,

Carlos
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Old 9th September 2009, 10:19 AM   #7
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Looks very nice!

Poople, could you turn your PM on? (goto User CP, Edit options on LH side)
I'd like to send you a message, thanks.
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