Mic, stop copying me!

I posted an idea for a compressed delay line a long-ass time ago (3 months):
http://circuitworkshop.com/forum/index.php?topic=1100.0

And Merlin was in on that thread, too.

atreidesheir wrote:Interesting. I was reading around the web and could not find a reference to the diode.

Search on "cathode diode bias" and read up on it. It works the same way with JFETs (or transistors).

atreidesheir wrote:What is the role of the diode in a common source amplifier?

You can bias the amp with a diode (instead of using a resistor from source to ground).

Or were you asking a rhetorical question?

juanro wrote:They neither.

Thanks, juanro! That's kind of what I was hinting at with my "cap to ground" comment previously. But you explained it all smart-like. :thumbsup But I do wonder why designers would use different pot values if they could simply just use one for everything. A few do, of course, but it seems l...

and we're not just talking "muffs and rats" here. I was trying to be funny. [smilie=poke.gif] You could quite easily mod some Op Amp circuits to work with the 100K pots, if one 100k pot (connected to say pins 1 and 2 of a TLO72) is being used to set the gain of the op-amp you just need to...

I have a solution for the 100K pot issue:

Everybody just make Muffs and Rats.

Don't laugh, half the boutique industry is Muffs and Rats. Okay, you can laugh.

So there's no feedback at all going on in the highlighted portion of the circuit no matter where the Shape pot wiper is?

Me no good at electronics.

Final Solution, eh. Ouch.


Destroying mojo is pretty fun, though. I smashed up some tropical fish caps. What a rush!

Interesting.

Is that feedback or feed-forward between the two op amps? Neither? Both?

Sweet. Can't wait to see what's under the hood.

WI'm reading the datasheet, and it says the minimum dark resistance is half a meg ohm but doesn't state the maximum Yep. That's the same one I used when testing the circuit. Or at least it appears to be the same: http://www.taydaelectronics.com/resistors/photoresistors/photo-conductive-cell-resisto...

Nice demo!

Jack Deville wrote:Devi, you crazy.

I agree.

The name is spot-on, though. I find it improbable that the circuit would work as drawn. And yet it does!

DrNomis wrote:I seem to recall that when Electroharmonix released the Big Muff Pi to the general public, they retailed for something like $19.00 to $39.00...

If you adjust that for inflation, that range is approximately $115 - $230.

I have found the multilayer caps to be, generally speaking, much tighter tolerance than the disc type. Most of the ML caps are 10%, whereas it seems like the disc caps are more like 40%.

Just as a test, I loaded the Discrete issue into Acrobat Pro X and ran the OCR engine on it. I'll have to say it worked quite well, and now the PDF can be text searched, and text can be copy-pasted from it as well. The pasting isn't perfect, but it's pretty close and is a lot easier than retyping. I...

I actually like the little multilayer ceramic caps. Small "footprint," all sorts of common sizes, nice and cheap, and 5mm spacing for most sizes from 100pF up to 1uF. Amen! :thumbsup I also like SMD ceramics for larger values. I got some 10uF in the 1206 size (same size as any other small...

soulsonic wrote:Seriously, looks like it's 100 years old in there. Like it was dug out of a cave or something.

Yeah, it looks like someone used a time machine to go forward 500 years and then found a Death By Audio pedal.

ik6gpy wrote:Capacitors generate distortion when they are actually implementing a time-constant.

You mean like in a typical passive R/C filter?