Elektor Formant Modular group photo

Yahoo Groups archive

Elektor Formant Modular

Index last updated: 2026-04-28 22:59 UTC

Message

Re: Hi! (And a quick question...)

2007-03-15 by kuczynskimarek

I'm also new here. Back in the 70's when I was a student, I couldn't 
afford to build the Formant. Now I'm a bit older... Anyway, I too 
found all the pdfs on the web and decided to have a go. I was not 
too impressed with the scans - they were a bit rough around the 
edges, over(under?) exposed so some of the holes weren't visible and 
some of them even had discontinuities due to bad scanning. I even 
came to the conclusion that the scans weren't 1:1 so would require 
some tweaking in Photoshop. In the end, I decided (because I'm 
totally insane) to redraft the PCBs using the original scans but 
with nice clear lines/holes etc. I also took the opportunity to 
redimension some of the components e.g. nobody uses HUGE 1/2W 
resistors or those humungous presets any more so I've made the pads 
closer together. I've also incorporated some of the changes e.g. FET 
stages in the VCO and a redesigned temperature-controlled 
exponential circuit due to the non-availability of the original 
chip. Also the dual matched pairs in the VCF etc have been rejigged 
to acept available devices.

The boards are supposed to be standard Eurocard size i.e. 100mm x 
160mm, except for the VCO which is "supposed" to be double-Eurocard 
but isn't, for some strange reason. As for the 31 pin conncetors. 
Has ANYONE managed to source these? I've replaced them with 32 pin 
connectors which are commonly available.

If you give me your e-mail address I can send you a VCF file (12 or 
24 db) so you can see what I've managed to do.

I've actually redrafted all of the main boards and I'm about to 
embark on the "Formant Book 2" boards. I haven't yet managed to 
manufacture a single board as I'm in the middle of building a 
workshop (shed actually) so I can slosh Ferric Chloride around with 
gay abandon. My wife has palpitations if I even bring a bottle into 
the house!

This offer is open to anyone in this Group. Tell me which boards you 
are interested in and I'll send you the files. You can be my guinea-
pigs until I get the opportunity to make them myself!

Marek

Attachments

Move to quarantaine

This moves the raw source file on disk only. The archive index is not changed automatically, so you still need to run a manual refresh afterward.