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Posts to:
Europe, United States, Australia, Canada, Japan
Posts to:
Europe, United States, Australia, Canada, Japan

Details about  new V3 DUAL AMP portable headphone amplifier

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new V3 DUAL AMP portable headphone amplifier
Item Ended
Item condition:
16 Jun, 2012 20:11:17 BST
Will post to United States. Read item description or contact seller for postage options. | See details
Item location:
London, United Kingdom


eBay item number:
Seller assumes all responsibility for this listing.

Item specifics

New: A brand-new, unused, unopened and undamaged item in original retail packaging (where packaging is ... Read moreabout the condition
Manufacturer warranty: Other: see item description

PLEASE NOTE:  I am on my holidays until 15/06/12. Any sales there may be will be posted on Monday the 18th. For this duration standard sale includes 5% discount. If you are purchasing with the upgrades I will then adjust your invoice before you pay to include 5% off from total.  During this time I have limited internet access and may not respond to questions/sales very quick. Thank You for looking.

DUAL-AMP DESIGN: Built around two separate identical opamp circuits for outstanding channel separation hence better stereo image.


LONG LASTING: Amplifier is powered with two internal  280ma 9 volt  re-chargeable NIMH batteries connected as 18 volts. One full charge can last up to 30 hours of non-stop usage.

500ma Li-ion battery upgrade option can last up-to 60 Hours of use! (see upgrades/modifications)

(above times depends on the listening volume levels)

USB RE-CHARGEABLE: Amplifier can be charged with any standard USB port as well as with the supplied USB power-supply-unit.


SUFFICIENT DRIVE: Highly suited for headphones above 200 ohms (as well as lower ones when used in low-gain mode).

Higher impedance headphones require higher driving signals to produce same level of sound compared to low impedance ones. With its 18v power source its outputs have more than sufficient drive needed to drive difficult, less sensitive headphones.


LESS DISTORTION/BETTER SOUND:OpAmps perform best when they operate closer to their max 18v operating voltage range.


MULTI GAIN:(User selectable): For low or high amplification of the input signal.


BASS ENHANCE MODE:(User selectable): When activated it enhances the low-end sound spectrum.  

This mode is specially suited for over-bright headphones.

Bass enhance mode is not over-powering! It just adds enough depth without loosing performance in rest of the sound spectrum.


HAND MADE: All soldering and final finishes are done by hand to very high standards.


TOUGH ALUMINIUM CASE: It is housed in a 100% shielded, hard coat anodized, very high quality aluminium case measuring 30mm x 63mm x 92mm (H-W-D).




Maximum Performance On The Go

Comparable to high quality desktop units. High output, amazing resolution, clean, precise, low noise, superb stereo image.
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Buy with confidence. Good audio reproduction comes from good engineering! I have two Electronics Engineering University Degrees and currently working as a full-time professional Electronics Engineer.
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Each amplifier is constructed slowly  by hand, and myself only to the highest audiophile quality standards.
◊ ◊ ◊



UPGRADE/MOD options:

Listed below are upgrade and modification options available during purchase:

(for any upgrade(s) please request the total before paying)


OpAmp Upgrade

Standard design is based on high performance OPA134 opamps. AD8610 opamp upgrade option is available.

These opamps are of the highest audio pedigree.

Additional fee of £15.


2 X 500mA li-ion BATTERY OPTION

500mA Li-ion battery upgrade option with auto turn-off when the batteries are full. These batteries can last very, very long hours.

More than 48 hours of use is possible (depends on volume level).

 Additional fee: £20


Bass-Enhance  easy- access case modification

Bass-Enhance switch is located underneath the PCB. It can be accessed only by opening front panel and sliding the circuit towards front.       I can offer a case mod where I place a 10mm hole and a thin plastic cap over the hole (see below)

Additional fee: FREE
















Above options may add 1 – 2 days of delay for ordering/fitting. (I do have limited spares in-stock, please check).

United Kingdom:
-First class recorded: £3.50
Special Delivery: £6.00

-Air sure : £9.00
Internationally signed for: £9.00


I will keep you informed ASAP

Thanks for looking

DUAL AMPLIFIER DESIGN Amplifier has been built to very high standards around two BurrBrown OPA134 opamps (or 2 x AD8610). Each opamp works independently from each other for powering the left and the right channels for excellent channel separation and better drive capability. OPA134(s) are FET input, ultra low noise, ultra low distortion amplifiers purpose built for quality audio applications.

•MULTI STAGE DeCOUPLING CAPACITORS ARRANGEMENT Various values of  high quality film and electrolytic  capacitors filter all ripple noise, eliminates copper track inductance/resistance for ultimate stability. Each OpAmp has its own local DeCoupling circuit.

•AUDIO CIRCUIT LAYOUT Circuit layout is designed very carefully for maximum audio performance.

•18 VOLTS RECHARGEABLE POWER SOURCE (+-9v) Power source of this amplifier are two standard high quality 280ma 9v rechargeable Nimh batteries connected as 18volts. One full charge can last up-to 30 hrs of use. 500ma li-ion battery upgrade option is available which from full charge these batteries can last up-to 60hrs of use! (times depend on the volume level but are realistic)


•CHARGING: Charging circuit is inside the amplifier itself. Powered with any standard 5v USB output.

Charging times:

280ma NIMH batteries: 8 - 10 hours overnight charge. Charging current slows when batteries are full. Manual turn-off advised.

500ma Li-ion batteries: 8 - 10 hours overnight charge. Charging current stops auto when batteries are full.

Above times are for full empty batteries. If you use the amp just few hours each day then 2 - 4 hours top-up charge is enough.


• DUAL GAIN  Gain of the amp can be altered to suit your headphones better. There are two gain settings.  Gain-1 is set to 2.3 and gain-2 is set to 6. Gain changing between 1 and 2 is simply done by removing and inserting of  2 gold-plated jumper links on the PCB. These jumpers are located within millimetres of opamps for less distortion.

•NEW BASS ENHANCE MODE: V3 has very carefully arranged bass-enhance filter.  Filter components including the gold-plated bass switch have been placed very-closely and within exact matching distance from each amplifying opamp. When activated it enhances the low end sound spectrum approximately by 20% which can help over-bright headphones.  When de-activated its effect is completely removed from the output.

Bass enhance mode is not over-powering! It adds enough depth without loosing the performance in rest of the sound spectrum

(Bass-Enhance switch can be accessed without opening the amp. See the upgrades/modifications section below)


Quality Components:

BurrBrown OPA134 or AnalogDevices AD8610 OpAmps

High quality, low ESR electrolytic smoothing capacitors

Wima DeCoupling capacitors

Alps volume pot

Low noise metal resistors

TLE2426 precision rail splitter IC

Gold plated gain jumper-links

Gold plated Bass-Enhance switch


Build Process:

•All soldering are done by hand to perfection with 4% silver solder.
•Fiberglass printed circuit board for better performance.
•Components are installed very closely to OpAmp ICs for minimum noise and better sound.
•Circuit layout is designed very carefully for maximum audio performance.



Very high quality aluminium enclosure. Dimensions: 30mm x 63mm x 92mm (H-W-D).
Solid Aluminium volume knob
Chrome plated on/off switch.
Blue power-on led, Red charger-on led.



•INPUT: 3.5mm Jack socket (can be connected with suitable cable to: DVD/CD, Ipod, MP3 player, computer sound cards, etc)

•OUTPUT: 3.5mm Jack socket



•Supplied with UK type 5v  power-supply-unit as well as a USB lead. Adaptors are given for EURO and AUSTRALIA type mains sockets.

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