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Old 25th July 2007, 03:33 PM   #441
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That is my own designed and made case. Made out of 5mm thick alluminium, with heatsinks as the side walls.
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Old 25th July 2007, 03:47 PM   #442
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" ... Bass could be better though, just trying to fix that now. ..."

Maybe add more PS filter capacitance?? This sometimes will put some "guts" into the bass.

Fixes for the high end, like fast recovery diodes in the bridge(s) and larger poly snubbing caps in parallel with the PS filter electrolytics also may improve the bass as well ...

That chassis is classy ...
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Old 25th July 2007, 04:03 PM   #443
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Yes i am planning on adding more PS capacitance, at the moment i have 4x 10,000uF in the amp. 10,000 on each supply rail, i will double this soon. Fast diodes will be the next upgrade, or perhaps just 4 snubber caps accross the bridge rectifiers. I have 1uf accross the chips supply rails, might be better to have 0.1uF as well.

It has also been pointed out to me that my high pass filter may be set to high.

See the thread on my design.

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Old 25th July 2007, 04:10 PM   #444
troystg is offline troystg  United States
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I see two chips per side. Since I don't see an inverting circuit / phase splitter I would "assume" they were parallel.

If so you may need a buffer to drive both chips adequately. I see you're using a passive pre, LOTS of people recommend a buffer. I am currently using an electronic high pass as the buffer in front of my LM38xx chips. I could tell a night and day difference in the "robustness" of the chip when I went from straight passive pot to the electronic xo between. High pass xo is set @ 50 Hz so it is probably not a "less load" type situation...
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Old 3rd August 2007, 04:56 AM   #445
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Reboxed my cmoy, as I had it in a dodgy plastic box with external battery pack.
Now nice and tidy with 2x9v batteries inside. All I need to do now is find 2 of those quick release 9v battery holders to mount in the back, but this'll do for travel next week to NZ.

I'm still amazed at the great sound you get out of these things. burbrown 132's (or 134? can't remember now)...

anyway pretty self explanatory front in/out low/high impedance headphones, vol. Back is power switch battery/off/external.

Click the image to open in full size.

Never noticed the screws look a bit messy, but thats how I got the box still in sealed plastic, but screws look dodgy.
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Old box I used, new cmoy case, roll of std electrical tape for size comparison.
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Old 3rd August 2007, 05:30 AM   #446
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amazing how your ears adjust to what you've got.
After thinking my pda was ok as is, I plugged the cmoy in and the sound is so much 'fuller' deeper bass (not louder, but more guts). Removed the amp and sounded like listening through a 2 meter pvc pipe :-/, tried adjusting the mixer and volume, but just can't get that 'sound', for $30 worth of parts makes any headphone 'better' :-) hehehe.
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Old 11th August 2007, 12:38 PM   #447
Mick_F is offline Mick_F  Germany
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Aha, I see. The thread has been censored
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Old 11th August 2007, 09:36 PM   #448
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Talking Poseidons Voice Anjali Amplifier

Well, she's finally come to life!

Front

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Rear

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Guts

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400VA/22X2 Plitron transformers per channel. Lundahl 1676 input amorphous core trannies, wired so I get either 30dB or 24dB of gain, and many other goodies. For more info and pics look here

Best,

Anand.
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Old 11th August 2007, 11:38 PM   #449
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Anand,

AudioCircle is replacing your pics with a banner... you will either need to attach the pics to the forum database i(or hope people follow the link)

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Old 12th August 2007, 01:20 AM   #450
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Anand, Looks good! How does it sound/perform with the Lundahl input trannies vs. without? I'm very curious as to what the trannies add to the mix. Best, KT
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