log/antilog pots with the buff'n-blend..

[cloudscapes]

hey all,
for this circuit:
http://www.geocities.com/jrtookmyfalseteeth/buffblnd.gif
the blended output volume dips quite a bit when closer to center. so far I only have experience with linear pots. would using a log or antilog pot improve this? should I go ahead and order some?

thanks!

[foxfire]

what circuit are you blending in? depending on what you're blending in, the volume shouldn't dip if everything is wired up correctly.

[cloudscapes]

hmmm... in a nutshell, an lm386 driving a transformer ringmod (plus a lot of stuff not in the signal path). the output inpendance to my ears is pretty close to the bypassed signal when fed into my amp.admitedly I'm not too hot with the math around this stuff.

I now  realize you might not be able to help me without a specific schem :\

if it helps at all, just the buffer part of the circuit (using a 2n5484) is about 2db quieter than the input signal, at any input volume. using a j201, it's even quieter. this is without any of the rest of the circuit. I can't see how the blend could operate properly if the buffer can't at least keep up with the original input. but like I said, I'm not too smart with this math stuff. I'm probably wrong

[John Lyons]

I think there was a note on the schematic about the circuit saying that it didn't work so well with a hot input signal.
Wasn't there also a resistor sub for that as well in the notes?
Maybe you could try Sean B's B blender.

John

[cloudscapes]

I think there was a note on the schematic about the circuit saying that it didn't work so well with a hot input signal.
Wasn't there also a resistor sub for that as well in the notes?
Maybe you could try Sean B's B blender.

John

thanks for the tip!
sorry for asking, but where's the sean b blender? google yielded nothing
hopefully I can keep this circuit small.

[foxfire]

here it is, http://seanm.ca/stomp/bblender.html.

[cloudscapes]

here it is, http://seanm.ca/stomp/bblender.html.

thanks!
this one works a lot better. it's kind of a lot of components though. if I had more room on my PCB, I might've used it.

I decided to go another route. the poor-mans blend. just two pots, one for wet and one for dry to one output. dry has a transistor buffer to prevent feedback. it's not as elegant as a real blend, but it works. I was going to add volume control anyway, so I'm not really using more knobs.

[foxfire]

hey if it works then who cares what it looks like.