headphone amp powered by 19v adapter

Thread Starter

juggler73

Joined Apr 10, 2010
47
hi
right i got it all soldered up and it went pop and burnt out the headphone amp chip.:(
so i check over the wiring and i had it backwards. oops

so im going to order another chip, and then i thought maybe i could get a better one.
any good substitutes or should i stick with the JRC4560D

thanks
 

SgtWookie

Joined Jul 17, 2007
22,230
Here's an OPA2604:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=OPA2604AP-ND
$5.32/ea.

Avnet Express is less:
http://avnetexpress.avnet.com/store...0201&term=OPA2604&x=0&y=0&N=0&action=products
but I don't know if they'll ship USPS 1st Class; Digikey will on SMALL orders, which saves money on shipping.

There's also the AD826 from Analog Devices.

You're going to have to find datasheets for the original opamp, and look at the datasheets for other opamps you're considering to compare specifications and pinouts.

I'm not going to do it for you, since it appears you don't listen to me anyway.
 

Thread Starter

juggler73

Joined Apr 10, 2010
47
hi
Its taken me ages to get the jrc4560d chip delivered
so i soldered it right this time but the amp wouldnt power up.

so i check the connection and noticed that the traces by the 8pin - and 1pin + - have lifted off.

i was going to buy another amp but then i thought that i could just transfer to a stripboard.

so just wanted it checked over

thanks
 

Attachments

Audioguru

Joined Dec 20, 2007
11,248
Here is why the circuit eats 9V batteries:
1) The LED uses 16mA which is more than the entire circuit. Change its 1k resistor to 10k.
2) Each opamp has a 1k "bias" resistor at the output (that reduces the 0.05% crossover distortion) and uses 9mA each. You cannot hear distortion as low as 0.05% so the resistors simply waste battery power.
 
Top