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Old 27th July 2012, 03:33 AM   #2181
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I've been experimenting with 12Au7 cathode follower buffers powered by the bipolar supply. I like what I hear.

Less bass than a straight TL084 buffer but some extra sweetness.

Last edited by marsvolta; 27th July 2012 at 03:36 AM.
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Old 8th August 2012, 11:00 PM   #2182
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Default Here's my latest LM4780 amp and PSU

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This is a snubberised power supply with 2 x 18v toroid and 3 x 3300uF caps per rail. The power LED is connected from the outgoing side of the the two fuses (one fuse for each rail +25 and -25) via an 82K resistor on each. This way, I know if the LED isn't lit, then one of the fuses may have blown.


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The sides are made of 12.5mm Corian and the front and back are 50x50mm aluminium angle. The Corian was drilled and tapped to attach the 12.5mm aluminium angle to it.


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Inside the amp. On the left is my star grounds for power and signal. In the middle is an AudioSector LM4780 board and on the right is my home made LightSpeed Attenuator. Originally the attenuator was to be attached to the chassis bottom, but I made a slight error, I forgot to leave room for the aluminium bar that presses the LM4780 to the heat sink. The attenuator circuit board is in mid air, being held in place by the LM317 regulator which is attatched to the chassis. The board isn't very heavy, so it should be OK.


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The rear section of the amp. The relay in the middle is part of my DC protection board. The wires run from the back of the amp enclosure to the front via slots in the small pieces of Corrian that are either side of the heat sink.


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The interconnecting power lead took a while to make, due to trying to get the plastic woven sheath up and under the rubber cable stresses. But I think it was worth the effort, I am very pleased with it.


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Both the PSU and Amp together.

Each enclosure measures 165mm wide, 150mm deep and 50mm high

I haven't had time to really test the amp, but at first listen, it sounds better that my other chip amp I made, which sounds great.
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Last edited by portreathbeach; 8th August 2012 at 11:13 PM.
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Old 8th August 2012, 11:09 PM   #2183
6L6 is offline 6L6  United States
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Very cool.



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Old 8th August 2012, 11:15 PM   #2184
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Thanks 6L6. Again, I managed to underestimate the size of all the components and have to cram them in, but I like a small footprint amp, they look neat when all of the lids are on.
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Old 8th August 2012, 11:30 PM   #2185
VT67 is offline VT67  Belgium
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Cute little bugger.

Regards
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Old 8th August 2012, 11:57 PM   #2186
SoIL4x4 is offline SoIL4x4  United States
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Cool use of materials! Looks great
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Old 11th August 2012, 12:28 PM   #2187
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Had a chance to really listen to this amp now through my TangBand W3-871SC full range speakers (with notch filter). It is definitely on par with my other chipamp (LM3785) I made. I think the Lightspeed attenuator may be giving it the edge. Very smooth sounding music. I am in the process of building a set of Derwent Frugal full range speaker with CSS EL70 drivers. Can't wait to hear the amp and these speakers
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Old 14th August 2012, 07:39 AM   #2188
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I just built for a friend a small little amp (LM3886 based).
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Old 14th August 2012, 02:21 PM   #2189
6L6 is offline 6L6  United States
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A very original case design! I like it.

Do you have photos of the inside?
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Old 14th August 2012, 03:21 PM   #2190
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Single enclosure, both the PSU and Amp together (measures 170mm wide, 250mm deep and 45mm high).

There is one single PCB (star ground connection realised with wires between signal ground and power ground for each amp separately).



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Originally Posted by 6L6 View Post
A very original case design! I like it.

Do you have photos of the inside?
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