WOW it works and it sounds GOOOD!!!!!!

aron · January 30, 2005, 05:08:16 PM

Joes Diode-compression op amp is a huge success! Sounds great in my Shaka pedal! Drop in replacement - has more feel and at the extreme drive ranges imparts a compression feel - similar to amp sag.

VERY COOL! The build is verified.

Go for it!!!!!!

http://www.diystompboxes.com/sboxforum/viewforum.php?f=16

Marcos - Munky · January 30, 2005, 05:50:32 PM

Cool, Aron. Could you post a soundclip with an A/B between a opamp and Joe's diode-compression opamp?

aron · January 30, 2005, 05:57:11 PM

I need bring home my minidisc. I can do a comparison at that point. Let me tell you it's worth it to build this!

brad · January 30, 2005, 06:18:29 PM

Oh, I didn't realise you could build a daughter board and use it to sub opamps in existing pedals! That's really a fantastic idea!

What's next, discrete hex inverters?

Karmasound · January 30, 2005, 06:21:40 PM

Sorry, but can I use a 2n5088 or 89 in place od the 2n5087?

edit- i realize the 2n5087 is pnp is there a sub i can use?

Gilles C · January 30, 2005, 06:27:16 PM

This could be a good use for this:

http://www.finitesite.com/gtechblues/My_images/DIPplugs.jpg

aron · January 30, 2005, 06:32:08 PM

You know it doesn't have to stop here. You can build any type of circuit there and then have a wild circuit where there was a mellow one before.

brad · January 30, 2005, 06:35:03 PM

Quote from: Karmasoundedit- i realize the 2n5087 is pnp is there a sub i can use?

Perhaps you could try a 2N3904 for the NPN and some 2N3906s for the PNPs? 2n5087s are a bit hard for me to get my hands on too.

btw, those DIP plugs would be great for this type of thing. You could goop it up for some extra mojo.

Karmasound · January 30, 2005, 06:41:45 PM

great i have some 2N3906s

newbie alert :shock:

brad · January 30, 2005, 06:56:24 PM

I don't know how it'll affect the circuit though, they probably don't have as much gain as 2n5087s. :?

Back on topic though, it would be interesting to build a dual version and try it out in a Boss SD-1, or even in place of the inline dual opamp in a DS-1. Perhaps even make it with SMD components...

MartyB · January 30, 2005, 07:03:03 PM

How cool is your forum Aron?

bigjonny · January 30, 2005, 07:04:51 PM

Oooh. I am excited to try! Here's a quick IC Protoboard layout I cooked up:

Note, I kept an empty "column" in the middle for running things between IN+ & IN-.

Marcos - Munky · January 30, 2005, 08:39:45 PM

What about a GE opamp with matched transistors? Looks like a great sound. Or maybe a hybrid opamp.

brad · January 30, 2005, 10:16:06 PM

An all Germanium opamp? Interesting! :shock:

brad · January 30, 2005, 10:18:08 PM

Oh, and about the discrete inverter I joked about...

...I don't know if there would be any benifits from using discrete components (other than tweakability), but wouldn't it be pretty easy to make? Interters are barely more than a pair of mosfets and a diode or two.

Peter Snowberg · January 30, 2005, 11:57:10 PM

This is soooooo cool!

Thanks again Joe!!!!!!!!!!!!!

stm · January 31, 2005, 02:13:17 PM

Talking about substitutes like 2N3904 and 2N3906, and other lower gain trannys, I have to add this could result in softer clipping, which can be good!

bioroids · January 31, 2005, 02:53:44 PM

Great!

Also would be worth trying some piggybacked transistors I think

Thanks Joe!

Luck

Miguel

WGTP · January 31, 2005, 04:42:15 PM

How about driving the tripler part of the Triple Fuzz with it?

Peter Snowberg · January 31, 2005, 04:57:57 PM

I wonder if the "good" part of the sound could be an effect of using resistors for current sources rather than active current sources?

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WOW it works and it sounds GOOOD!!!!!!

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