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Old 28th June 2003, 01:43 AM   #11
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Default Thanks PRR

My amplifiers are all in the same box, so there's no reason for any of the DA outputs to get shorted. The amps are all LM3876T's (P19) with 22k input resistors. I'll use your configuration with 10 x 1K buildout resistors. And I'll let you know how it goes. Thanks again.

Cheers, BC
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Old 28th June 2003, 03:36 AM   #12
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BC also look at the LM353 data sheets....(helll I know there is better op amps out there now)...but thats what I learned to use..hahahaha...I`m just a DIRT

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Old 29th June 2003, 09:36 AM   #13
joensd is offline joensd  Germany
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Thanks PRR for the insight and your experience with such circuits.

Cool the thread´s still alive.
So far I actually just tapped off the OUT from my soundcard to feed the active speakers and headphone amp.
Connecting the hifi to the PC I have to replug a little but it doesn´t matter so much and works quite nicely.

Still the question is in my head as I´ll plan some preamp soon.
Maybe something like this active pot which won´t need any buffer at all methinks.

As the Bride of Zen will be another option for the preamp I´d probably have to take the output impedance a bit more into account as it ranges from 0 to 1.5kOhms depending on setup.

Talking about buffers...
What about a simple mosfet follower.
Any drawbacks with that kind of circuit?
You could use it as headphone amplifier (like the Szekeres) and tap off all the line-outs you need from that.
Two flies with one clap?
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Old 30th June 2003, 10:37 PM   #14
PRR is offline PRR  United States
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> this active pot which won´t need any buffer at all methinks.

Well, except that it IS a buffer, actually two buffers around a pot.

Sound card outputs are usually under 100 ohm source impedance. As long as you don't have shorted wires, or don't mind trouble-shooting when sound goes dead, you can stack lots of 10K or 22K loads on it, simply parallel ("Y-cords"). Ten 10K loads in parallel is 1K, and a sound card can drive 1K fine.

In for-pay audio, we have to be defensive. A radio station has to be on the air 24/7, even when some idiot helper like me is trying to get a tap of the main signal. Recording live concerts, there is always some kid who comes running up the same instant that the conductor goes on-stage, and wants to tap his beat-up MiniDisc player into the recording bus. And I myself have plugged outputs into outputs and wondered what was wrong.... So a "good" distribution amp has to be short-proof, and even isolate stray signals fed in the output so they do not leak into other outputs.

> For PC, as declared by joensd in the first post, this might be considered as sufficient solution.

In general, one buffer with many build-out IS the best way, assuming you can find a beefy enough buffer. In broadcast the standard now is 60Ω build-out resistors, so if you might have a dozen shorted outputs (it is amazing what can happen in a large broadcast operation {at least this was true in analog days}) then your buffer looks a lot like a loudspeaker amp.

You may argue that a 074 is only good enough for PC music, and I won't debate that too much. Of the cheapo chips, I do like the LM837, if only because the output is beefier than the 074s. There are tons of better op-amps if that's what you want.
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Old 1st July 2003, 01:40 AM   #15
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Distribution amps that I have seen use TDA amplifier chips (TDA1541? etc) and build-out resistors.
This is a cheap, effective and good performance eway to do it.

Eric.
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