I have maked a Zen Headphone Amplifier Kit - diyAudio
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Old 5th March 2003, 08:27 AM   #1
digi01 is offline digi01  China
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Cool I have maked a Zen Headphone Amplifier Kit<PIC>

I configured the Zen in the following manner:

Power BOARD-
AC 22V/2, SAMWHA 10000Uf/35V as C1/C2.

AMP BOARD-
Wima MKT-2 4.7uF/100V as C2 and Ninchicon Golden-4 100uF/63V as C1/C3
NICHICON-2 2200Uf/40V as C6
MY homeland¡¯s matel RED series resistors
IRF610-4 Q1/Q2
C1815-2 as Q3
Gold-Plated RCA input jacks
ALPS BLUE volume
Original 3.5mm Jack output
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Old 7th March 2003, 05:42 AM   #2
digi01 is offline digi01  China
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some picture of the appearance .
Click the image to open in full size.

Click the image to open in full size.

A A4 Paper size, height 5 cm
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Old 7th March 2003, 05:55 AM   #3
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Congratulations!
Very very nice cabinet.
Marcello
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Old 7th March 2003, 06:03 AM   #4
Taco is offline Taco  Netherlands
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On the background I see another head-phone amp? Describe the sound of your new amp, is it very different compared to a std. output of a cd-player?
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Old 7th March 2003, 06:04 AM   #5
Rob M is offline Rob M  United States
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Looks great! How's it sound? I've been trying to think of what to tackle as my next project, and that's a strong contender.
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Old 7th March 2003, 07:03 AM   #6
digi01 is offline digi01  China
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Another one is a Opamp-based Amp.What the circuit is consulted is COMY AMP .Power supply of a transformer AC12V X2.Op use a OP275.
This is it inside PIC.
Click the image to open in full size.
Click the image to open in full size.

Output of a old SONY D-135 cd-player.
The cable is a pair of Monster interlink400MKII.

Listen to sense OP amplifier voice fashionable, have passion relatively tentatively. But the sound disturbs , do not hear long.
ZEN make warm, balance stage,can very fine drive HD495 headphone of me, remedy tiny voice it .

Wait a moment I will put the inside picture of ZEN to , make a POST for the first time, thank everybody for paying close attention to
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Old 7th March 2003, 08:46 AM   #7
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COMY or CMoy?!
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Old 7th March 2003, 11:22 AM   #8
digi01 is offline digi01  China
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Sorry,I do a mistake The Headphone Amplifier is by Chu Moy.
tortello,This is my ZEN inside,thank you maked this job : )I am don't made the muting timer and equalizer circuits .Please give me some advice about this.
Click the image to open in full size.

If u can't see the image ,download the same Attach file.
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Old 7th March 2003, 02:33 PM   #9
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Hello Digi01,
I think that the equalizer is not mandatory at all, I've made it to tame the Grado 325's high frequency exuberance, but with other stuff - even with other headphones of the same brand - I don't use it.
The timer is useful if you employ low impedance headphones, which are quite sensitive, like mine: with yours this should not be a problem.
Consider that the original Grado RA-1 amplifier has a turn-on bump itself: I've measured a peak of about 3V!
They ensure that this does not damage the coils, but consider that the Grados with few millivolts do sing...
Congratulations again for your creation.

Marcello
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Old 7th March 2003, 07:09 PM   #10
joensd is offline joensd  Germany
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Hi tortello,
I am about to build your amp as well and wanna skip the equalizer and the timer.
What about a regulator that slowly raises the voltage.
Would this especial circuit be enough against turn-on bumps?
You could just make the 10uF at the gate of the mosfet a lot bigger which should give a slow "turn-on"!?

Jens
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