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Old 4th March 2012, 08:33 AM   #1
shaan is offline shaan  India
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Default DOZ - Death Of Zen 15 Watt Power Amplifier

Hi all.

The existing threads on DOZ seem to be about complains targeted to people who are not related to this amplifier and/or hollow debates on the supiriority of one amp over another.

So here is a thread where we can concentrate solely on DOZ as a standalone amplifier which produces music comparable to the sound of the best DIY Class-A amplifiers available.

I built both Capacitor coupled and Direct coupled versions; both with their advantages and disadvantages. The cap coupled version has less demand on the PS filtering and is less complex, while the direct coupled version has more stable bias and subjectively cleaner sound with no capacitor in the output and the feedback path.

Cheers...

PS. No Flaming Please, Comment only if you are interested in DOZ in a positive way.
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Last edited by shaan; 6th May 2013 at 07:42 AM. Reason: some more texts...
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Old 4th March 2012, 10:21 AM   #2
godfrey is offline godfrey  South Africa
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Hi Shaan
Nice work! Dare we ask for a peek at the underside (or should I say dare you show it? )

A couple oh questions - What is the empty chip socket for in the 2'nd pic, and why on earth is there a tapped hole in one of the fins of the heatsink on the left?

btw, I found the DoZ details here on Rod Elliott's site, but no mention of a direct coupled version. Could you provide a schematic or a link?

Thanks - Godfrey
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Old 4th March 2012, 10:34 AM   #3
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Knowing Shaan, it will be just as neat as the topside Very nice as usual Shaan!

Tony.
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Old 4th March 2012, 09:28 PM   #4
shaan is offline shaan  India
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Quote:
Originally Posted by godfrey View Post
Hi Shaan
Nice work! Dare we ask for a peek at the underside (or should I say dare you show it? )
Sure, tomorrow I will. Thanks.

Quote:
A couple oh questions - What is the empty chip socket for in the 2'nd pic, and why on earth is there a tapped hole in one of the fins of the heatsink on the left?
The chip socket is for TL072, the offset servo. The tapped hole was there when I snatched the heatsinks from an ATX SMPS.

Quote:
btw, I found the DoZ details here on Rod Elliott's site, but no mention of a direct coupled version. Could you provide a schematic or a link?

Thanks - Godfrey
Sure, see the attachment.
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Old 4th March 2012, 11:54 PM   #5
kp93300 is offline kp93300  Malaysia
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HI Shaan
What is the estimated output into 8 R with the balance circuit above ?
What is the difference in sound between this amp and JLH ?
Always admire you work .

thanks
kp93300
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Old 5th March 2012, 04:13 AM   #6
shaan is offline shaan  India
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kp93300,
The circuit is not balanced. The left board is capacitor coupled single supply type and the right board is direct coupled dual supply type with offset servo, both stereo. The above schematic shows the direct coupled design.
I don't know what the power output of a blanced circuit will be, but I am sure it will have less overall distortion.
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Old 5th March 2012, 07:14 AM   #7
shaan is offline shaan  India
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Originally Posted by wintermute View Post
Knowing Shaan, it will be just as neat as the topside Very nice as usual Shaan!

Tony.
Thanks tony.
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Old 5th March 2012, 07:18 AM   #8
shaan is offline shaan  India
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Quote:
Originally Posted by godfrey View Post
Hi Shaan
Nice work! Dare we ask for a peek at the underside (or should I say dare you show it? )
Here it is.
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Old 5th March 2012, 07:42 AM   #9
shaan is offline shaan  India
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Default For the interested.

This is the exact schematic I used in the direct coupled version, everything except the power transistors are on-board. The diode-bridge+zener+bjt regulator for the opamp was a first time for me and it works well with no bad effect on the turn on/turn off event; i.e. no thump/click/pop etc..
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Old 5th March 2012, 08:43 AM   #10
shaan is offline shaan  India
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Quote:
Originally Posted by kp93300 View Post
What is the difference in sound between this amp and JLH ?
Always admire you work .
thanks
kp93300
Into 8ohm load, I found no difference between them when TIP3055 is used with DOZ and 2SC5200 used with JLH'69. When I revert the transistors an interesting thing happens. DOZ sounds too bright with 5200(HF oscillation?) and JLH sounds okay with 3055, although with less treble. JLH seems more forgiving to transistor varieties.

Still, I chose DOZ as my favorite as, when used with cheap 3MHz transistors, 1) it has perfect balance in bass, vocal, treble; I can listen all day without getting bored and 2) My 4ohm speakers sounds equally fantastic to 8ohm ones with DOZ, JLH didn't pass this test.



Thanks for the kind words.
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