Dan's Duo

mictester · Post by **mictester** » 07 Dec 2010, 00:08

A friend complained that his old "plug-in" Orange Squeezer was stolen at a gig. He said he sometimes liked the sound of the Squeezer into the Dan Armstrong Distortion box. As each circuit just needs one op-amp, I thought I'd make best use of a 4558, and build a squeezer on one side and a distorter on the other. I added level pots for both, and bypass switches, so you can bypass everything or use each effect alone or both together.

The attached pictures show the PnP and the layout. You can work out the external connections yourself (or some kind person can draw them up over my diagram).

: Dan's_Duo_PnP.gif (6.49 KiB) Viewed 2027 times

Enjoy!

sinner · Post by **sinner** » 07 Dec 2010, 00:11

Thank you Chris

mictester wrote: Enjoy!

I will! Thanks again

SPeter · Post by **SPeter** » 10 Dec 2010, 23:34

Thanks!

roseblood11 · Post by **roseblood11** » 22 May 2011, 16:08

Mictester, could you explain, why you changed some parts values in the blue clipper part?
Why such high values for the voltage divider resistors? Doesn´t that increase hiss?
The 22nF cap at the output tames the treble a lot, I guess?

Dirk_Hendrik · Post by **Dirk_Hendrik** » 22 May 2011, 17:02

Some suggestions to ensure succesfull etching as wel as layout hygene:

: Dan's_Duo_PnP.png (2.95 KiB) Viewed 1687 times

Then.
I consider this resolution way too crude for etching. Better post it at a far larger (say 3000 px wide) size with the suggested real life size. and let the printer do the resizing. Iview is excellent for that. Other than that, the component pads are rather small.

coldcraft · Post by **coldcraft** » 22 May 2011, 20:13

I'd like to reiterate what was just suggested.

I won't make any comments about the layout provided here, but I etch for people all the time and its very frustrating to receive layouts that have tons of empty space and small traces and/or pads with very little space between them. It is MUCH easier to transfer/etch/drill layouts with ground plans and and larger isolation between traces. I'm not saying its easier to achieve a workable product, but its more easily reproducible. I find myself having to make fewer extras in case one doesn't quite transfer correctly or over-etches.

The results are much better if the effort goes to transferring more mask/pnp than it is to etch more copper. YMMV, these are just my opinions from experience.

mictester · Post by **mictester** » 23 May 2011, 05:55

roseblood11 wrote:Mictester, could you explain, why you changed some parts values in the blue clipper part?
Why such high values for the voltage divider resistors? Doesn´t that increase hiss?
The 22nF cap at the output tames the treble a lot, I guess?

The increased resistors were to reduce the input loading (part of the original sound was the treble loss introduced by the original lower values), and the 22n tames the resultant top end. It sounds pretty good for such a simple circuit!

mictester · Post by **mictester** » 23 May 2011, 05:59

Dirk_Hendrik wrote:Some suggestions to ensure succesfull etching as wel as layout hygene:
Dan's_Duo_PnP.png
Then.
I consider this resolution way too crude for etching. Better post it at a far larger (say 3000 px wide) size with the suggested real life size. and let the printer do the resizing. Iview is excellent for that. Other than that, the component pads are rather small.

It was a rushed job, and probably not up to my usual standard! I etched a batch of ten of these, and they were all fine, however.

I've done a further version which includes CMOS switching which I'll put up here this week as an example of what can be done with CMOS and to show how much simpler the off-board wiring becomes.

roseblood11 · Post by **roseblood11** » 23 May 2011, 08:27

Inspired by the Dan´s Duo, I combined mictesters Really Cheap Compressor and the Vox 1901 Distortion:
https://www.freestompboxes.org/viewtopic ... wrapheader