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Old 1st May 2012, 06:20 PM   #2151
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Nice work SoIL4x4. I assume the spring on the volume pot is used to adjust the resistance of the pot? Loving the clear lid, not sure how it would look if you lit the inside up.
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Old 1st May 2012, 06:29 PM   #2152
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Here is my latest amp. It's a little cMoy headphone amp built into an old iPod 40Gb case. I built it to run my new Sennheiser HD280 Pros. It runs on a single 9v battery, which can be charged via a DC jack on the bottom. The switch is for bass boost, the on/off switch is built into the volume pot. The OpAmp used is a Burr Brown OPA2132PA and I have set the gain of the system to 3.3

I used 2 SMT LEDs for the power light and charging light. These are soldered to a piece of strip board and glued to the case. In picture 2, you can see the blue LED shining through the iPod front. The charging LED is below this and is red.

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Last edited by portreathbeach; 1st May 2012 at 06:32 PM.
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Old 1st May 2012, 09:32 PM   #2153
SoIL4x4 is offline SoIL4x4  United States
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Quote:
Originally Posted by portreathbeach View Post
Nice work SoIL4x4. I assume the spring on the volume pot is used to adjust the resistance of the pot? Loving the clear lid, not sure how it would look if you lit the inside up.
Thanks, yes there is a spring on both sides. It helps with "feel" of the knob. Yeah I may leave well enough alone on this amp and plus I ordered a lighter note today so I have to prepare for a new project

I love how compact your amp is. It is a great use for all the broken ipods out there!!

Last edited by SoIL4x4; 1st May 2012 at 09:34 PM.
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Old 24th May 2012, 08:00 PM   #2154
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Here is my latest little amp I built of some spare parts. It runs from 12 volts and the chip used is a TDA1519C. The sound is OK, nothing compared to my Gainclone or my headphone amp, but it'll do for the workshop...

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Click the image to open in full size.

The schematic used was the one straight out of the datasheet, nothing special apart from a 10 ohm resistor between signal ground and audio ground to help with ground loops etc.
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Last edited by portreathbeach; 24th May 2012 at 08:04 PM.
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Old 25th May 2012, 03:21 AM   #2155
Oery is offline Oery  Indonesia
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Quote:
Originally Posted by SoIL4x4 View Post
Audiosector LM 4780 pcbs standard BOM parallel/dual mono configuration
Antek an-3222 toroidal transformers with antek covers
Nichicon gold tune 6800uf power supply caps, 13,600uf per rail
Clarity caps MSA 4.7uf input caps
amb e27 colume control pcb
alps rk27 potentiometer
Cardass ACBP binding posts
Cardass CTFA rca's
Schurter MSM 19LA power switch
8audio volume knob, refinished to match brushed aluminum
Heatsink USA 6" x 6" heatsinks
walnut side panels cut from May 8, 2009 inland hurricane storm wood, tung oil finish
2024 aluminum parts cut and finished using hand tools and a drill press
total weight @43 lbs
love it ! --- superb
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Old 25th May 2012, 03:48 AM   #2156
La Mer is offline La Mer  China
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This is mine. LM3886 Ref.E diagram, plus music fidelity A1 preamp. Finished in Jan. of 2011.

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Old 28th May 2012, 02:28 AM   #2157
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My project:

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Old 1st June 2012, 02:21 PM   #2158
Pato666 is offline Pato666  Argentina
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portreathbeach that's a sweet amp!!!
GREAT WORK!
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Old 1st June 2012, 02:53 PM   #2159
bcmbob is offline bcmbob  United States
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Marsvolta,

Your clean and minimal wiring really appeals to to me. Nice. Did you ever listen to the amps without a tube pre and if so what differences did you hear. Which one is that? Might be my next project - curiosity is getting the best of me.
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Old 1st June 2012, 03:29 PM   #2160
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Default GC LM3886

Another my GC LM3886 :

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