Chip Amp Photo Gallery

[pelayostyle]

hey pelayostyle
do you still have a parts list minus the enclosure laying around, I would be great to just have a shopping list and buy everything at once besides the tranny and the enclosure. You have all of this XLRs and Power Female plugs and the amps and control. Plus my enclosure is almost identical to yours, I would really love to built almost a replica of your amp.

Thanks, Lincoln

Although I wish this was my amp, it belongs to nycavsr2000

 

[Unclewinky]

Thanks, ...and Sorry.

 

[g payne]

Well... now that I finished my amp i guess i should throw some pictures in here.
It's a "chipamps.com" lm3886 stereo kit,an 18v torroid and an alps 20k pot. I made the enclosure from an 8" section of 5x5" aluminium square extrusion 1/4" thick with solid walnut end caps.
I am very pleased with how this kit went together and how good the amp sounds.

Thanks to everyone on this forum for the inspiration.
Graham

 

[poseidonsvoice]

Thanks for posting Graham. I like your enclosure reminds me of some of the enclosures sold by IAG Audio several years ago: IAG Home

Enjoy!

Anand.

 

[farley]

Graham - clever, innovative use of materials. Well done.

 

[davym]

Nice work and built well enough to become a puzzle for future archeologists 😎

 

[g payne]

Thanks guys.
It is definitely a solid enclosure, I wouldn't want to drop it on my toe. But it does make a great heat sink.
The other surprising outcome of using it was that my wife remarked how she liked the sleekness and look of it. Happy wife, happy life and I don't have to hide it from view.

 

[smartx21]

6x LM3886 inside a PC case

Oooops, I forgot to put the cover.
Details can be discussed here: http://www.diyaudio.com/forums/chip-amps/297595-dual-mono-pa150.html

 

[scigu63]

Gainclone case ( with class D amps )

Here is my GainClone case, built using a couple of tin candy cans.

More information on “The reverse GainClone” thread ( http://www.diyaudio.com/forums/chip-amps/297538-my-reverse-gainclone-idea-gaincard-like-case.html ) in Chip Amp Forum.

Ciao.
Luca

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[mravlca]

LM3886 Mono Amplifier

For a long time I really wanted to have small chipamp built around LM3886. I had few Hammond 1455T1601 enclosures laying around and decided to make mono amplifiers. Cases are 165mm wide, 160mm deep and 46.5mm high. It was quite challenging to fit power supply and amplifier into such small enclosure.
I designed amplifier PCB which measures 40mm x 25mm and that is only slightly bigger than 2€ coin. It doesn't have big filtering capacitors, but I can fit 680uF 35V in there. Since classic power supply (toroid and filter caps or similar) would be too big to fit in such small enclosure I was searching for PCB mountable SMPS. I was using SMPS, from Meanwell, to power LM3886 before, but only bigger models. I stumbled upon IRM-60-24 which is just small enough to fit two of these into the enclosure. For heatsink I used aluminum block (40 x 40 x 100).
How it turned out see the pics!

Best Regards,
Aleš

p.s. Those two ants should see the oculist😀 I wasn't able to hit those holes perfectly🙁

 

[OlegSh]

Looks really cool, especially the ants🙂

 

[mhouston]

I agree, every amp doesn't have to be black. Nice build very pro. Love the heatsinks.

 

[davym]

Very nice work indeed.

 

[ukhopeful]

Thanks. To be honest electronics design is my main profession and fine mechanics a secondary. However I build this completely at home as a fun project. Just in my own workshop by hand with regular hand tools and an electric hand drill + drill stand. Only for bending the heat pipes I borrowed a special bending tool from a friend. Casing did come ready made (to some extend) from Ebay.

The PCB in front is the PSU control. It is the click-on-click-off and remote power control to power it on/off from my pre-amp. It also has the inrush current limiter, dc protection and over temperature protection. With 2x 120VA transformers inrush limiting isn't strictly necessary but it avoids the switch on "humpf" and less aggressively charges the buffer caps at power on.

Heat pipes can have the habit (but not necessarily do) to degrade after 10 - 20 years. So I added thermal cut-off's for safety.

Power is 80W rms_sine into 4 ohms and 55W into 8 ohms before clipping. More than sufficient for regular listening. My speakers are 6 ohms mostly.

 

[ukhopeful]

Pjotr
Regarding your build: http://www.diyaudio.com/forums/chip-amps/79303-chip-amp-photo-gallery-299.html#post4663745
Can you provide some more details on the PSU control board please? Is this a commercial product? What corresponding board did you use in the preamp to trigger it?

 

[Pjotr]

It is a custom push-on-push-off board based on the well known NE555-flipflop p-o-p-o circuit. There are many examples circulating around on this board. It is not a commercial product. The preamp simply has a 12V steady output signal when on to control a power amp. The usual way.

 

[ukhopeful]

Ah OK. Is the inrush current limiter, dc protection and over temperature protection on a custom board too?

 

[john blackburn]

ukhopeful

There is a switch driver circuit on AMBs website that can have a thermal trip fitted with a pcb available.
The ε24 power switch driver circuit

Elliott Sound Products has soft start and speaker dc protection circuits also with boards available.
Soft-Start Circuit For Power Amps
Loudspeaker Protection and Muting

Hope it helps

 

[Pjotr]

Ah OK. Is the inrush current limiter, dc protection and over temperature protection on a custom board too?

Yes, is customised to fit in the cabinet at hand. So it's a one of. Attached the DC protection. It is an integral part of the power amp PCB. The opto controls the reset of the NE555 FF on the relay board. In case of DC it just turns off the whole amp. This way, DC protection from as much as needed amplifier boards can be simply paralleled without interference/ground loops.

 

[Daliar]

Lm3886 handmade amplifier

Lm3886tf 4ohm or 8ohm at 19V an 25V
Dac lampucera with tubes
2 mores inputs selection
VU meters