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Old 27th September 2009, 12:15 AM   #131
Bigun is offline Bigun  Canada
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Keantoken - I suggest we follow your caution and keep the NFB before the output capacitor.

Now, changing topic again to the subject of Crossfeed. Headphone amps need a switcheable cross-feed between channels, at the input. I am assuming that we'd place the associated components at the switch itself rather than on the pcb - any thoughts on this ? - this gives people the choice to include or not to include it.
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Old 27th September 2009, 12:28 AM   #132
keantoken is offline keantoken  United States
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I think it is a good idea.

It doesn't need to be this complex, does it?

http://www.headwize.com/projects/meier_prj.htm

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Old 27th September 2009, 12:40 AM   #133
MJL21193 is offline MJL21193  Canada
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Switchable crossfeed is a nice touch. Having it on the board would be neat - less parts flying.
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Old 27th September 2009, 12:41 AM   #134
keantoken is offline keantoken  United States
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Could we attach a separate board to the switch itself?

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Old 27th September 2009, 12:44 AM   #135
Bigun is offline Bigun  Canada
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If we had a standard enclosure we could put almost everything on the board, but it would require everyone to use the same parts and whilst this would be good for a kit, I don't think that's what Hugh has in mind.

A separate board is possible, but it adds to the complexity, Hugh is only going to make one pcb, it will have both channels on it.

We could pick one edge of the pcb to be at the chasis edge and onto this edge we could have pcb mounted connectors/switches if we wanted to.

We could also make the switch one of those pcb mounted DIP switches and it could be accessible from a small hole in the chasis. Not convenient if you want to change the setting often but quite good enough if you usually keep it at one setting. And lower cost too.

We need to boil this thread down to a reference design and a BOM.
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Last edited by Bigun; 27th September 2009 at 12:46 AM.
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Old 27th September 2009, 12:46 AM   #136
MJL21193 is offline MJL21193  Canada
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Assuming the switch is panel mount and not mounted on the PCB, sure it could have a small board attached.
I'd like to see as many controls and components attached to the main board - this includes input and output jacks, switches and pots.
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Old 27th September 2009, 12:48 AM   #137
keantoken is offline keantoken  United States
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I like the DIP switch. If someone wants an outboard switch, they can take the DIP out and solder the wires.

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Old 27th September 2009, 12:52 AM   #138
Bigun is offline Bigun  Canada
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OK, so let's post a reference schematic that includes the cross-feed, all the swtiches and connectors. The power supply is still tbd. The options seem to be a) cap multiplier, b) CLC. Hugh is leaning towards CLC.

I'll help compile a BOM based on digikey.



(gotta go, movie starts soon...)
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Old 27th September 2009, 12:53 AM   #139
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Quote:
Originally Posted by Bigun View Post

(gotta go, movie starts soon...)
What movie?
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Old 27th September 2009, 01:35 AM   #140
keantoken is offline keantoken  United States
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It doesn't seem like hum is a problem in Hugh's other amplifiers, which are not headphone amps. So it should be possible to get satisfactory performance without the regulator. So I could go either way.

There is one thing I want to make note of. A Jfet current source has somewhat poor PSRR, but it adds plenty of H2. Recall the input bias configuration I used. It actually increases H2 in the simulator. Should we try it?

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