[sdiy] buggy efm seq2

[Keith Winstanley]

In-Reply-To: <20010801150734.V23566-100000 at devil.technoendo.net>
> Hey,
> 
> So, I finally got my seq2 wired, but there are some problems.

Hi, took me a while too!

> Anyone here have experience in building/debugging this thing?

*gibber*


> Here are the symptoms:

> 2) step button causes steps to be skipped.  The pushbutton is debounced
> with a capacitor, but it seems that it still causes multiple triggering.

I cured this with a 0.01uF ceramic, you have to try a few different values


> These symptoms sound familiar to anyone?
> 
> Oh, and yes, I did cut away that one pad that was overlapping a trace.

I think there is an overlap on the pad next to Pin 1 of U6 4069 connecting it to pin 4-

maybe this is causing some of your other problems??

I also ended up having to change R46 & R41 to 10K to enable correct functionality,
I heard of no one else having this problem so I dont know what went on there??

I hope you are using blue LEDs?
:o)

> Also, I guess it would be pertinent to ask where the EFM webpage and/or
> mailing list went...  A hard thing to find on google, it seems...

Moved to yahoogroups, you will have to re sub
EFM_Synth at yahoogroups.com

Apparently the web page was totally lifted, and I think will be new and improved 
very soon?

>From list:
=======================================================
> Don't worry....EFM will be back bigger and better than ever.
> I'm not going anywhere. We are going to continue just as soon
> as I get my crap together. I know it's been several months now
> and there is still no apparent end in sight but I have been 
> working hard and will soon be ready to return to business as
> usual.
> 
> I have thrown out all the old stuff and started over..... again. I
> want the next series to be damm near perfect... at least to the
> point that it's the absolute best that can be done for a reasonable
> buck.
> 
> The addition of punched panels and complete kits had been a lot 
> of trial, error and compromise. I have run two new series of boards
> and one set of overlays but decided to toss 'em in favor of something 
> else. I want a standard across all modules new and old. I had given
> up and was just going on with it but at the last minute my brain 
> turned on and I got the solutions I needed. So ....we begin again.
> 
> My time-table was set for last month...but it looks like it's going to be
> September....... maybe sooner if things go well. I hope to release 14 
> modules and the BassAce2 boards and kits. The book will follow
> shortly after the boards.
> 
> Tom
=======================================================

Cheers...

Keith

http://home.freeuk.net/lowpass