Turn a Dist Amp into multi headphone out ?

I would think it might possible to just tweak the output circuits of a D.A., to power multiple headphones?
How many circuit changes am I looking at?
(add a daughter board current booster per output...?)
I have several D.A.'s laying around, this being one:

(schemo on page 6)
http://www.radiosystems.com/PDF/da8da16-man.pdf

I'll need to see if it's PSU can handle it.

=FB=

The link doesn't work.

Chances are, the answer is going to be "not without a lot of work"--unless, perhaps, you're only going to use 600-ohm cans.

As pointed out in Pucho's recent thread, multi-output headphone amps are so cheap nowadays, most DIY alternatives just aren't worth the trouble unless you're bored or just want a learning experience.

The one DA which should work as a headphones driver is a Philip Drake module which uses TDA2030 power amps as the output devices. 600-ohm cans would work OK with the Drake module.

It's certainly a functional DA, but technically a bit of a cop-out as the 2030 output goes to a set of resistors which isolate each output pin. The purist's DA has each output seperately driven.

As pointed out in Pucho's recent thread, multi-output headphone amps are so cheap nowadays,

Click to expand...

OK, gotta agree with that. Here is the working link annywhoo :

http://www.radiosystems.com/PDF/da8da16-man.pdf

and other usefull pdf's "for learning purposes only, please respect copyrights".
http://www.radiosystems.com/technotes.html

=FB=

[quote author="NewYorkDave"]

As pointed out in Pucho's recent thread, multi-output headphone amps are so cheap nowadays, most DIY alternatives just aren't worth the trouble unless you're bored or just want a learning experience.[/quote]

I agree with dave. When I posted the thread it was a work question that came up and was decided by the higher ups one could be built for cheaper. I disagree but they want to try anyway.

IF the DA has some serious grunt and can work way down to low impedances then it can work

BUT I want to add to that ...
generally I find that +20dBu is not enough .. unless the program feed is limited

I think you need up around 30dBu
and if that amp can push that level into 10 to 20 ohms
... well ... you really do have an amp

now you know why people use small 30 and 40 Watt power amps with a passive split

For a DIY stereo DA amp
try the Jaycar Kit (see the DIY Factory)

I haven't done it yet ... but I'm eager to try a JLM Hybrid as a Headphone driver