freestompboxes.org

uncleboko wrote:Microsynth problem - start frequency point is fixed by start frequency slider, so when triggered the sweep will always rise/fall to this point, which can be boring

Better to control start frequency point from note strength - not easy. Others are trying to do this.

.....foot pedal is very useful for this(and footswith disengaging triggering)......
those others......do you have more info?

b.

so ive started with this project,
etched the main pcb, the potboard one is to big for my etch can
anyway ive wanted to resize it because im gonna use regular pots instead of sliders.
when done im gonna share it, maybe i could get the original layout files borislav for easy edit?
so i wanna make my build with bass/guitar version into one box, i went over the layout using schematic to find the components which differ.
ive marked em, and also found a possible error on the main pcb in the smooth filter between c9/c8 theres a 22k resistor which i believe should be 2k2 (R21 in the schematic) if im not reading the schematic wrong up with the schematic.

borislav can you confirm this?


files in attachment, enjoy!

jazzmaster

Congratulations, Boris!!!

This really shocked me, must say! Svaka ti čast. I've read loads of informations about the design, problems with finding original parts, etc...
anyway, I'm thinking about doing one myself but with some modifications, first to build it in a rack mounting box and trigger it by footswitch.
Ok, that would demand commonly used round pots, which from what I hear aren't so precise
Second, I'm stuck with finding (choosing) the right parts for this projects, so this is what I found out this far:

The 4558's should be easly replaced by some newer op amps, like TL082 or 072 (I don't really know the difference)
The problem is CA3094, some say it's unique, some say LM13700 could be a good substitute, since I'm starting with nothin but schematics, 8-pin or 16-pin makes no difference. Ever thought about any replacements?
Since I have much trouble finding the original parts (discontinued or not, I live in Slovenia), choosing the right parts would be a good starting point before I start drawing my PCB.

Any help will be much appreciated and Boris, I thought I was the only one crazy

thanks man......
komsija pozdravljam te....

it would be great to make this with lm13700 otas....new wersions of MicroSynth have them instead of ca3094......
post your results ...I would love to see...

https://www.freestompboxes.org/download/ ... &mode=view

so this made with regular size components would be next step.....

boris

hmmm...

from what I see 13700 is used instead of pair of 3094's. ok, that makes sense.
I don't quite understand everything about pinouts yet

can you post more detailed pictures of pcb, I would really appreciate it. Maybe I could figure something out...

Thanks, man

Bbcxs wrote:hmmm...

from what I see 13700 is used instead of pair of 3094's. ok, that makes sense.
I don't quite understand everything about pinouts yet

can you post more detailed pictures of pcb, I would really appreciate it. Maybe I could figure something out...

Thanks, man

you have those pictures here on forum........search.....

b

Fantastic work borislavgajic! Thx a lot for sharing it with us!

I hope that somebody will make a project using 13700 instead of 3094 because I want it very much

gigelmargel wrote:I hope that somebody will make a project using 13700 instead of 3094 because I want it very much

I want it so

but my electronic's knowledge are too poor to well work this project

use 4558 chips ...not TL082.........082 do not work nice ....bad tracking,triggering

http://yfrog.com/6xlayoutbassj
http://yfrog.com/jdelementyzpotencjometramj
http://yfrog.com/b6schemat2wj
http://yfrog.com/64schematqj




Sorry do not know English, I attach a draft Thomas. Yours

Welcome man......
thanks for project
Can you post part list?

Boris

http://yfrog.com/9ems5fj
http://yfrog.com/j3ms3fj
I posted the drawings płytak with a non-compliance, if anyone knows please colleagues for an explanation. Yours

Fantastic work roberttomasz!!!
Thanks a lot for sharing it!

MANY THANKS roberttomasz!

here are some demo of my clone .....without foot pedalll for now.
http://www.box.net/shared/5bt30dqocs



Boris

That's the Micro Synth - excellent demo!!

EXCELLENT MR. GAIC!

THANKS!

thanks for compliments.....
here is with foot operated filter....but not so good sounding(I guess camera microphone is not for this uce).....it is muuuch sharper , and better sounding in reality

#!


Cheers

Boris

Are anybody have lay file for MicroSynth? Lay-file for Sprint-Layout will be best, but in any other (not graphic, but CAD-format) will be good too...

Hi, first, great job in the pcbs and layouts Borislav!
Please i need help!, i made one of this amazing pedal, but doesn't work, i have seen on the oscilloscope, the signal path and this is lost in the last stage(attack delay), right in the output, in the last CA3094 there is no signal in the pin1 of the IC A14, maybe because i don't use the 2n5088, i use the BC549, it's a replacement for the 2n5088? i'm not shure, someone knows a replacement? i can't find this transistor in my city.
I have -10V on the pin5 of the CI A14 (CA3094), is that normal? , and on the schematics between D10 and D11 says "HIGH ON SILENCE", what does it means? i have too -10V at that point (6), i don't understand what's the problem with the last CI . i tried to changing the CIs and still doesn't work.

Thanks, and sorry about my english .