ZKIT3
Portable headphone amplifier kit

This is the PARTS and CIRCUIT BOARD for our current production
Zen Head model ZH-1

The Zen Head is quickly becoming one of the best sounding portable headphone amps in the world - as evident by the threads on head-fi.org ! Now you can build one yourself without our fancy machined chassis and save some serious cash!  Kit comes with everything shown above.  You supply the 9 volt battery.

CIRCUIT BOARD

Based on the Burr Brown OPA2132 op amps, this kit will drive audiophile headphones between 10 ~ 600 ohms with around 50 hours of battery life.  It uses 3.5mm stereo input and output jacks. It features one of the best sounding cross feed circuits out there (this baby images!) but if you don't like cross feed you can simply turn it off. Additionally there some other switches that allow you to tweak the unit while you listen:

1) Crossfeed - on / off

2) Inter-stage gain level - hi / low
Adjusts inner dynamics - the effect is subtle

3) Input impedance - 32KOhms / 10KOhms
The 10K setting gives the unit lots of gain and lots of hit, ideal for IPODs etc., the 32K setting is less gain better suited for standard 2 volt outputs from your favorite CD player or DAC set up.

4) Output impedance - HiZ / LoZ
This can be used to best compliment the sound of your headphones.  LoZ will drive almost all headphones up to 600ohms, as will the HiZ setting.  Choose based on the best sound and performance with your phones.  NOTE: When using this as a line level preamp the unit should be sest to HiZ only.

OPA2132 DATA SHEET

 ZEN HEAD Rev 5 SCHEMATIC

 ZEN HEAD Rev 6 SCHEMATIC

ZEN HEAD OWNERS MANUAL

 KIT AFTER ASSEMBLY

 LARGE HI-RES IMAGE HERE

Product Detail	Price (USD)	Ext. (USD)
Mouser #: 534-84-4 Mfr. #: 84-4 Manufacturer: Keystone Electronics Desc.: Battery Holders, Snaps & Contacts 9V BATTERY STRAP RoHS: RoHS Compliant	$0.45	$0.45
Mouser #: 595-OPA2132P Mfr. #: OPA2132P Manufacturer: Texas Instruments Desc.: Op Amps High Speed FET-Input Oper Amplifier RoHS: RoHS Compliant	$11.11	$22.22
Mouser #: 660-MF1/4DCT52R4702F Mfr. #: MF1/4DCT52R4702F Manufacturer: KOA Speer Desc.: Metal Film Resistors - Through Hole 1/4W 47K ohm 1% RoHS: RoHS Compliant	$0.06	$0.12
Mouser #: 660-MF1/4DCT52R2202F Mfr. #: MF1/4DCT52R2202F Manufacturer: KOA Speer Desc.: Metal Film Resistors - Through Hole 1/4W 22K ohm 1% RoHS: RoHS Compliant	$0.06	$0.12
Mouser #: 660-MF1/4DC4701F Mfr. #: MF1/4DC4701F Manufacturer: KOA Speer Desc.: Metal Film Resistors - Through Hole 4.7K 1% 100PPM RoHS: RoHS Compliant	$0.06	$0.12
Mouser #: 660-MF1/4DC3300F Mfr. #: MF1/4DC3300F Manufacturer: KOA Speer Desc.: Metal Film Resistors - Through Hole 330ohm 1% 100PPM RoHS: RoHS Compliant	$0.06	$0.12
Mouser #: 598-DMM2P22K-F Mfr. #: DMM2P22K-F Manufacturer: Cornell Dubilier Desc.: Polyester Film Capacitors .22UF 250V 10% RoHS: RoHS Compliant	$0.49	$0.98
Mouser #: 71-CCF551K00FKE36 Mfr. #: CCF551K00FKE36 Manufacturer: Vishay Desc.: Metal Film Resistors - Through Hole 1/4watt 1Kohms 1% Rated to 1/2watt RoHS: RoHS Compliant	$0.08	$0.16
Mouser #: 140-REA472M1EBK1632P Mfr. #: REA472M1EBK-1632P Manufacturer: Lelon Desc.: Aluminum Electrolytic Capacitors - Leaded 25V 4700uF 20% 16x31.5mm RoHS: RoHS Compliant	$1.44	$1.44
Mouser #: 140-REA331M1EBK1012P Mfr. #: REA331M1EBK-1012P Manufacturer: Lelon Desc.: Aluminum Electrolytic Capacitors - Leaded 25V 330uF 20% 10X12.5mm RoHS: RoHS Compliant	$0.19	$0.76
Mouser #: 660-MFS1/4D52R1000F Mfr. #: MFS1/4DCT52R1000F Manufacturer: KOA Speer Desc.: Metal Film Resistors - Through Hole 100ohms 1% 100PPM RoHS: In Transition	$0.09	$0.54
Mouser #: 525-EN22 Mfr. #: EN22 Manufacturer: Energizer Desc.: Consumer Battery 9V 550mAH SNAPS RoHS: Not Applicable	$2.19	$2.19
Mouser #: 598-CD15ED470JO3F Mfr. #: CD15ED470JO3F Manufacturer: Cornell Dubilier Desc.: Mica Capacitors 47pF 500V +/-5% RoHS: RoHS Compliant By Exemption	$0.77	$0.77
Mouser #: 108-2UD1T1256-EV    Mfr. #: 108-2UD1T1256-EV Manufacturer: Mountain Switch Desc.: Toggle Switches DPDT ON-ON PC MOUNT RoHS: RoHS Compliant	$3.27	$13.08
Below is ALTERNATE PART for Mountain Switch above
Mouser #: 611-GT21MCBE Mfr. #: GT21MCBE Manufacturer: C&K Desc.: Toggle Switches DPDT ON-NONE-ON PC MOUNT RoHS: RoHS Compliant	$8.77
Mouser #: 660-CF1/4C222J Mfr. #: CF1/4C222J Manufacturer: KOA Speer Desc.: Carbon Film Resistors - Through Hole 2.2Kohms 5% RoHS: RoHS Compliant	$0.15	$0.60
Mouser #: 313-1240F-10K Mfr. #: RV122F-20-15F-A10K Manufacturer: Alpha (Taiwan) Desc.: Potentiometers Audio D-Shaft 10K RoHS: RoHS Compliant	$3.16	$3.16
Mouser #: 80-R82DC4100AA60J Mfr. #: R82DC4100AA60J Manufacturer: Kemet Desc.: Polyester Film Capacitors 63volts 1uF 5% RoHS: RoHS Compliant	$0.94	$3.76
Mouser #: 611-7201-051 Mfr. #: 7201MD9ABE Manufacturer: C&K Components Desc.: Toggle Switches ON-ON DPDT RA PC RoHS: RoHS Compliant	$8.91	$8.91
Mouser #: 606-CMW01G Mfr. #: CMW01G Manufacturer: Chicago Miniature Desc.: LED Circuit Board Indicators HI EFF GREEN DIFF RIGHT ANGLE RoHS: RoHS Compliant	$0.66	$0.66
Mouser #: 806-STX-3100-3N Mfr. #: STX-3100-3N Manufacturer: Kycon Desc.: Phone Connectors 3.5mm PCB STEREO BLK 3P RoHS: RoHS Compliant	$1.02	$2.04
Mouser #: 660-MF1/4DC1003F Mfr. #: MF1/4DC1003F Manufacturer: KOA Speer Desc.: Metal Film Resistors - Through Hole 100K 1% 100PPM RoHS: RoHS Compliant	$0.06	$0.12
Mouser #: 660-MF1/4DC1002F Mfr. #: MF1/4DC1002F Manufacturer: KOA Speer Desc.: Metal Film Resistors - Through Hole 10K 1% 100PPM RoHS: RoHS Compliant	$0.06	$0.54

For additional information on availability, click on the Mouser Part #. Note:  Some parts will become obsolete as is common with electronic parts and you may have to find a suitable substitute.  Mouser makes this easy by showing you similar parts with the same specs.

 BOARD ONLY

  OPTIONAL MACHINED CASE w/ Battery Holder and Blank front plate

 FRONT PANEL DRILLING TEMPLATE HERE

NOTE: This is the same case as our production unit, but done in white and with a different front panel so that there can never be any confusion between a Zen Head built by Decware and one built from a kit.

MADE IN USA

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 Decware products are proudly hand made in the USA by High Fidelity Engineering Co.
 Copyright © 1996 ~ 2013 by Steve Deckert