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Old March 10, 2012, 05:42 PM
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Default objective2 headphone amp

In addition to making my own arcade style joysticks, one of my other hobbies is building audio equipment.

I got a custom order to build an Objective2 headphone amp

NwAvGuy: O2 Headphone Amp

the normal build is portable, the two 9v batteries should last 5-6 hours on normal head buds.

the client wanted a desktop version using the bigger case. the bigger case allow the addition of the front mounted 1/4" headphone jack and rear mounted RCA jacks in addition to the normal 3.5mm input and output.

the gain settings are customized for the headphones the client will be using, and has enough power to drive most headphones.

for the price (starts at $150 goes up to $250) you really can't beat this amp.

my next project I will post it to share with you guys

-joe
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Old March 10, 2012, 06:38 PM
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Quite the nice little box. Just to confirm after seeing the plug hole on the back but i'm assuming you can use a power adapter instead of the batteries?
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Old March 10, 2012, 06:57 PM
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Quote:
Originally Posted by Keywork View Post
Quite the nice little box. Just to confirm after seeing the plug hole on the back but i'm assuming you can use a power adapter instead of the batteries?
the design uses batteries as the primary power source for maximum performance

the dc-in is to charge the batteries

there is a way to modify the circuit to run only on dc-in, but you will lose performance and portability

--

better pics attached

-joe
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Last edited by jtktam; March 10, 2012 at 07:04 PM.
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Old March 10, 2012, 07:01 PM
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Quote:
Originally Posted by jtktam View Post
the design uses batteries as the primary power source for maximum performance

the dc-in is to charge the batteries

there is a way to modify the circuit to run only on dc-in, but you will lose performance and portability

-joe
Could you not rig up something to use 2 USB ports as USB port allows up to I think 5v does it not?
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Old March 10, 2012, 07:09 PM
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the power circuit requires 12 to 15v DC at 500ma to 1a

usb 5v will not work..

internally the two 9v batteries give +9vdc / gnd / -9vdc (spilt rail power supply)

-joe
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Old March 10, 2012, 07:58 PM
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I've been wanting to build one of these, but the cost of the enclosure is nearly four times that of the actual parts. Not really into making anymore mint tin amplifiers myself.
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Old March 11, 2012, 07:19 AM
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Originally Posted by ilya View Post
I've been wanting to build one of these, but the cost of the enclosure is nearly four times that of the actual parts. Not really into making anymore mint tin amplifiers myself.
the enclosure is what "normal" people see and also makes it durable... mint tin amps are cool as a "wow" factor but the footprint makes it impossible to create any sort of amp that will drive decent headphones

i do sell the kits with and without face plates / enclosures if you wanted to make one yourself

-joe
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Old March 15, 2012, 07:27 PM
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I'm the client who asked Joe to build this amp. I just registered on here up to let people know that I received it today, it's a beauty, fits in the palm of my hand, and sounds fantastic. Great work, Joe!
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