I have maked a Zen Headphone Amplifier Kit

[digi01]

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

[digi01]

some picture of the appearance .




A A4 Paper size, height 5 cm

[tortello]

Congratulations!
Very very nice cabinet.
Marcello

[Taco]

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?

[Rob M]

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.

[digi01]

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.



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

[tortello]

COMY or CMoy?!

[digi01]

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.


If u can't see the image ,download the same Attach file.

[tortello]

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

[joensd]

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