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My portable headphone amp [cmoy]

post #1 of 8
Thread Starter 

Circuit based around CMOY design

Custom PCB

WIMA MKP10 input caps

OPA2134PA op-amp

Panasonic FM 470uF power cap

Laser cut black acrylic for end plates

 

 

 

 

 

 

 


Edited by miniq - 8/15/13 at 5:59pm
post #2 of 8

Did you get your board done by OSHPark?

 

Nice job!

post #3 of 8
Thread Starter 

Yup.

post #4 of 8

How long does that 9V battery last?

 

Btw, great build! Good job


Edited by Zarrick19 - 8/16/13 at 11:09am
post #5 of 8
Thread Starter 
Quote:
Originally Posted by Zarrick19 View Post

How long does that 9V battery last?

 

Btw, great build! Good job

Around 6-7 hours max. 


Edited by miniq - 8/16/13 at 5:12pm
post #6 of 8

Did you go single-supply on that one? (I'm asking because the TO92 part next to the battery looks like a TLE2426, but there's only one reservoir cap and two leads from the PSU board to the main board) If so, what made you choose that over the 'standard' CMoy virtual-ground option?

post #7 of 8
Quote:
Originally Posted by yawg3d View Post

Did you go single-supply on that one? (I'm asking because the TO92 part next to the battery looks like a TLE2426, but there's only one reservoir cap and two leads from the PSU board to the main board) If so, what made you choose that over the 'standard' CMoy virtual-ground option?


He does have two rail caps...the other one is harder to spot.

You can see it in the second last picture nestled in by the

two input caps. and yes, it uses a TLE2426 for the virtual

ground driver.

 

Oh, I see what you mean now...just the one electrolytic....right behind the pot.


Edited by Avro_Arrow - 8/17/13 at 4:45am
post #8 of 8
Thread Starter 

The second homemade board is the trickle charger using an LM317 regulator to provide a constant current to charge the NiMh battery.

 

The TLE2426 is on the main purple board which provides a two rail supply both of which have WIMA bypass caps (you can't see it in any of them pictures but it's above the LED you can see where it should be placed on the PCB picture)


Edited by miniq - 8/17/13 at 6:47am
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