Remaking a one-off custom job.. help...

[quadwould]

Still working on this.... (well it got shelved for a little while....) but now the work is back on

I am going to make a point to point replica of the original to start off. This will also be on breadboard like the original....

So for this i am still seeking an 8038 and an SSM2013.. ugh...

Have yet to get this into software. but am hoping to in the xmas break....
pictures of the original to be posted soon

 

[peterc]

Check out the Synth diy mailing list, someone will probably have the ssm chip there.

http://dropmix.xs4all.nl/rick/Emusic/Synth-diy/

Peter

 

[beatpoet]

[quote author="quadwould"]
second, a waveforme gen, RS 305 844 aka ICL8038CCPD
Below is what you get at the RS website.

" Waveform Generator,ICL8038CC
* RS Stock no. 305-844
* Manufact. part no. ICL8038CCPD
Discontinued product"
so, anyone know where i can get these?[/quote]

I think I might have one of these. I'll check if you still need one.

 

[quadwould]

as promised.. here are some pics of the unit

http://www.flickr.com/photos/9233112@N05/2144297832/

http://www.flickr.com/photos/9233112@N05/2144296380/

http://www.flickr.com/photos/9233112@N05/2143499141/

http://www.flickr.com/photos/9233112@N05/2144297834/

for more just click go to my album

My first attempt will just be a point for point duplicate. Once i have confirmed that it operates the same as the original, i will use that one to test against any new ones made on the new pcbs

I am keeping the graphics the same (using engraving though) and will be adding the logo of the record label run by the producer.


Does anyone know where i can get front panels done to have that slightly flaking look?

still having issues sourcing ssm2013s and 8038.. (admittedly have not tried too hard recently, as i have instead been stuffing my face with all sorts of foods... tis the season.....)

 

[quadwould]

so i sourced the 8038 and the hard to find SSM2013..

just about to order the few passive components i don't have readily available, namely the caps and the odd switch or two.

i have taken a few pics of come caps that are puzzling me.

I think most of these are Tants but some i am not sure, none of them are ceramic. I'm not sure if a few of them are small polyester or high voltage discs or what..

and there are a few that are axial and clear that i am not sure what type they are. maybe poystyrene...

i am wondering why the designer used so many different types of cap and if it would matter if i got the values right and the type wrong.

I know that in theory if the specs are the same then the caps should function relatively similarly, but i also know that different types of cap react differently and have a variety of response curves which could effect performance.


anyone?

links to pictures below

cheers for any help




http://www.flickr.com/photos/9233112@N05/2543144804/

http://www.flickr.com/photos/9233112@N05/2542319477/

http://www.flickr.com/photos/9233112@N05/2542318901/

http://www.flickr.com/photos/9233112@N05/2543142836/

http://www.flickr.com/photos/9233112@N05/2542317545/

http://www.flickr.com/photos/9233112@N05/2543141450/

http://www.flickr.com/photos/9233112@N05/2542314079/
(the one i can't identify is the axial one wedged in there. it said "7v5" Is that a cap or a diode?)

http://www.flickr.com/photos/9233112@N05/2542267239/

 

[mcs]

[quote author="quadwould"]http://www.flickr.com/photos/9233112@N05/2543144804/[/quote]
Polystyrene - still made by LCR and Electel (and probably others). You could use the blue Philips/BC polypropylenes also.

http://www.flickr.com/photos/9233112@N05/2542319477/

The silver one looks like another polystyrene. I can't see the blue one clearly. If flat, it's probably ceramic. If it's "drop" shaped it's a tant.

http://www.flickr.com/photos/9233112@N05/2542318901/

Not sure. Could be either ceramic or polyester. What text is on it?

http://www.flickr.com/photos/9233112@N05/2543142836/

Tant.

http://www.flickr.com/photos/9233112@N05/2542317545/

Multilayer ceramic. Siemens Sibatit?

http://www.flickr.com/photos/9233112@N05/2542314079/
(the one i can't identify is the axial one wedged in there. it said "7v5" Is that a cap or a diode?)

That's a 7.5V zener diode.

http://www.flickr.com/photos/9233112@N05/2542267239/

Another tant.

Best regards,

Mikkel C. Simonsen

 

[kazper]

The first picture looks like a polystyrine type cap, but it could be a older Glass diode.

Picture 3 looks like a molded film of some type

Picture #4 is a Tant 1U 35V Line indicates Positive side

Pic #5 shows 2
The left one looks like a Ceramic, but also could be a small tant.
The right one is a 3.84 to 5.76 uF (4.8 uF +/-20%) 250 volts
From the Yellow,Grey,Orange,Black,Red code

http://www.csgnetwork.com/capcccalc.html

 

[quadwould]

http://www.flickr.com/photos/9233112@N05/2542318901/

It has 4K7 100V on it, so i wold expect a cap, but could it be a diode?

cheers for the help. almost there, just a last couple bits to figure out and then i will have the BOM. joy..

 

[mcs]

Should be a 4n7 100V cap.

Best regards,

Mikkel C. Simonsen

 

[quadwould]

Pic #5 shows 2
The left one looks like a Ceramic, but also could be a small tant.
The right one is a 3.84 to 5.76 uF (4.8 uF +/-20%) 250 volts
From the Yellow,Grey,Orange,Black,Red code

Actually it is Yellow, Violet, Orange Black Red

I checked this against a philips sheet and it actually came out at 0.047uF with a 20% tolerance.

i thought the size of the new component was a bit too big at 4.7uF and seemed to be right.


BOM is almost there. Just a few user interface parts to source