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What? - A Low Power Desktop Amp

Posted 6th April 2013 at 08:52 PM by BuildMeSomething
Updated 9th April 2013 at 07:31 PM by BuildMeSomething (Updates)

2] Basically, this is me trying to do a 2-layer PCB layout based on the LPUHP circuit schematic.

I'm using FeePCB for laying out. Not hit any problems with the software yet and it produces Gerber RS247X files. The parts library is none specific, so I'm having to generate footprints from datasheets as I go.

1) Untested PCB design [should work though].
2) 2-Layer PCB.
3) 2 channels per board [16 x LME49600].
4) LME49722 with 4x gain.
5) Up to +/-18VDC rails.
6) Separate regulated power supply.
7) Utilise a 10K Alps RK27 for volume control.
8) 8 Watt into 8 Ohm [based on 2VRMS input].

Aim is to create 1 x power supply & 1 x amp board of a small enough form factor to fit in a desktop friendly case. With an output of 8 Watt into 8 Ohm load, for up close & nearfield listening in a small room.

Why the LME49722. Its drop in replacement to the nice 49720 but will run on +/-18VDC,...
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Why? - A Low Power Desktop Amp [LPDA]

Posted 6th April 2013 at 08:34 PM by BuildMeSomething
Updated 26th April 2013 at 10:26 AM by BuildMeSomething

1] I hold opc's "The Wire" series of headphone and power amps in high regard. Small form factor, simple no nonsense designs and killer performance. God bless that man

I'm fortunate enough to have a few pieces at home. Primary, is the SE-SE headphone amp that gets used for both music and late night movies... Also, under construction is the A/B Power Amp, utilising two 55V/45V DPS-600 smps. This should provide over 100 Watt per channel into 8 Ohm load. Nice, but way to powerful for my spare little room.

opc designed a Low Power Ultra High Performance [LPUHP] Amp giving 16 Watt into 8 Ohm @ 1% THD. This was based upon the headphone amps he'd designed, using the same LME49990 opamp, but paralleled 8 LME49600 buffers.

Unfortunately I didn't have the funds to get both the A/B Power Amp and LPUHP Amp. Plumping for the former...

My little spare room is just that... Its 3m[w] x 2.9m[L] x 2.4m[H] and is full of...
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My Ikea Blanda Bowl Build Diary

Posted 6th April 2013 at 07:56 PM by mondogenerator

So upon seeing many nice Blanda bowl projects here on DIYAudio I thought it about time I had a try and see what all the fuss is about!

About a year or so past I went through a phase of buying the nicest small wide-band drivers I could. Whether I achieved this is subject to the readers' opinion

So I have a pair of Mark Audio Alpair 5, and a pair of Tangband W3-1285SG. Both of these drivers were available to me in the UK at a very similar price-point and they both fall roughly into the 3" wide-band category. (Shown in the following picture alongside some Tangband 2" drivers)

Click the image to open in full size.

I chose to buy the 20cm Blanda bowls in bamboo. Gross volume works out at ~2 litres. Factor in stuffing or denser absorbent and I guesstimate a 1 litre volume.

This is really too small for the Alpairs, but the 2 dB rise towards the cut-off wasn't...
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