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Old 8th May 2004, 12:11 PM   #1
TimS is offline TimS  New Zealand
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Default Son of Zen+, Headphone Amp

Hi All

Let me know what you think of this headphone amp design.
It is a combination of the Son of Zen amp and a bipolar-mosfet interpretation of the CFP.

The design simulated well so i am building it.
Instead of the BC549C's i am using a LM394 and i hand matched the resistors to 5dp's

I am really interested in hearing your feedback.

Thankyou

Tim
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Old 8th May 2004, 09:50 PM   #2
TimS is offline TimS  New Zealand
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I just noticed I didn't include the transistor types in the circuit, so some of my previous post didn't make much sense.
Q1 and Q2 were simulated as BC549C's but i used a LM349 in the actual circuit.
M1 and M2, just about any P-Channel mosfet seemed to work. i simulated and used IRF9540's, cause i had them.
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Old 9th May 2004, 12:16 AM   #3
paulb is online now paulb  Canada
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Boy, it's hard to read your schematic! Could you put it on a white background instead?
Or maybe it's me....
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Old 9th May 2004, 02:30 AM   #4
TimS is offline TimS  New Zealand
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I agree but that is the pic that Microcap 6 generates.

I copied and edited a window capture and so attaching the results.
I have included all the components this time.

Tim
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Old 9th May 2004, 02:52 PM   #5
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Why not just build the ZEN 6 with IRF610`s just scaling all the
resistors by a factor of 3 ? By the way at these power levels
some good mills resistors and or a battery power supply wouldn`t break the bank.

Woody
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Old 9th May 2004, 03:55 PM   #6
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Would you scale ALL the resistors? Or just the ones setting the bias? What would be the resulting bias? Thanks
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Old 9th May 2004, 06:57 PM   #7
paulb is online now paulb  Canada
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Why not try your own circuit? It looks very simple. Would you modify your headphone cable to give you 4 wires instead of 3 (eliminating the common ground)?
You can always build a Zen version later and compare the two.
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Old 10th May 2004, 09:29 PM   #8
TimS is offline TimS  New Zealand
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paulb

I am already building my circuit!
I have finished the amplifer but i have yet to finish building the PSU, attenuator and the case.
i have had a brief listen to it, connected to a lab supply and it sounds really good, but i was running it from my rotel preamp and believe it can sounds even better with a passive stepped attenuator connected directly to my cd player.
I will attach some pics soon.

woody

This circuit is an enhanced version of the son of zen, it has the advantages of improved linearity and wider bandwidth with the addition of just a few extra camponents. In fact either of the actual son of zens and the balanced zen line stage could be modifed to give improved performance with this mod (i might even do the sims on this and publish the results).
Though modifiing it to the supersymetric design is a really good idea and is something i should try out in the simulations

Measurements:

The simulated measurements for the current design are such:
%THD @ 10kHz = 0.02%
%THD @ 1kHz = 0.015%
The -3dB bandwidth is 7Mhz (and probably should be reduced!)

The distortion figures are measured just before the onset of clipping, into a 32R load, and reduce from there.

Tim
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Old 12th May 2004, 11:41 AM   #9
TimS is offline TimS  New Zealand
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Default supersymmetric headphone amp

Well i have converted the simulation of my enhanced son of zen headphone amp to the supersysmmetric layout like zen v6 and I cannot improve its performance over my original design. But her is what i have come up with:
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Old 12th May 2004, 11:46 AM   #10
TimS is offline TimS  New Zealand
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But i did have very good results with enhancing the standard son of zen and the supersysmmetric son of zen
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