[sdiy] EFM News: Argo & 3500 Modulars

[tomg]

>  I did not study the layouts to see if its easy
> to glue pairs together, or to sub the 2SA798 and 2SC1583.
> It would work better with matched pairs... 

I left it easy to swap out , if you want to use pairs you
could drop a 1583 in there real easy....... but only you 
really only need to match the diff-pair. The current mirror 
won't make much, if any difference and there is no real 
point in matching the darlington.

> but as discussed
> on list lately... matching from the same lot is usually pretty
> good anyway.

Yes it is.... :)

> I just bought CA3046 for $.24 each... otoh they are not PNP
> which Tom's new design needs (some of)

Not really... If you remember the first time I did this. I used
the 3046s for the diff and darlington and 3906s for the pnps.
I did it wrong first time but I got it right :)  BTW $0.24ea is
a great price! Can't shoe-horn a 3046 in these though...

 > For the newbs, transistors might be more forgiving as well... and they
> are dirt cheap (maybe $.06 ea)

Cross my heart... :)

> Tom... you do not get to bitch unless they cancelled your order
> and did NOT INFORM you.  :^P    (like MCM did to me on some 2SC1583)
> 
> H^) harry

Oh yes I do Harry, I had boards made thinking I had parts.

I've got maybe 120ea of the C1583, A798 and C3381 left.
I was thinking I might offer them up at 6ea per person or
something like that, maybe $1ea..After that.. they'll be gone 
too.. I've got maybe 500 removed from pcbs short-lead 
2N4853s I still want to make a new UJT synth cause they
sound so nasty but I'm thinking I could sell 250 @ 5/$1.00
and include at least 2 with longer (short) leads.

Regards
Tom



> tomg wrote:
> 
> > Just to continue this for another second or two..
> > When they canceled my order and I cried
> > foul.... To make me feel better I was told that
> > they had several more accounts that use 3000
> > or more a month and they were buying up
> > everything they could find..... Yeah that made
> > me fell a lot better... right!
> >
> > To be honest I felt like I had been outbid
> > how do you loose 500 pieces?
> >
> > There may be a few here and there but I've
> > got this feeling that it won't be long before it's
> > hard to find any at a good price.
> >
> > Regards
> > Tom
> >
> > > I had a 500 piece order canceled. They offered
> > > me NTEs at $1.60 each. I scrapped a complete
> > > series of modules. In my book that's demised.
> > > RIP 3080.. Dead dead dead!!!! and I don't care.
> > > I've got maybe 90 pieces left and when they are
> > > gone..... well I won't be buying NTEs.. :)
> > >
> > > Regards
> > > Tom
> > >
> > >
> > >
> > > >
> > > > --- tomg <e4m at houston.rr.com> skrev::
> > > > > Some may have guessed that the Argo was a test bed
> > > > > for the 3500 stuff. After the demise and disappearance
> > > > > of the 3080 the logical thing (it seemed to me anyway)
> > > > > was to build a synth that didn't have IC OTAs in it.
> > > >
> > > > It have not disappered nor demised!
> > > >
> > > > Reg
> > > > KD
> > > >
> > > >
> > > > >
> > > > > The only two circuits needed to build an Argo that are
> > > > > missing from the 3500 Part-1 are the AR eg and the
> > > > > ADSR key-trigger.
> > > > >
> > > > > Turns out a bunch of people want one!?. :)  I hope to
> > > > > complete the Argo carrier board (for 3500 pcbs)
> > > > > sometime this year. I have plans to use pcb mounted
> > > > > pots and switches on a much smaller board.= smaller
> > > > > case = lower cost... ect  so It's practically built :)
> > > > >
> > > > > You can hear many of  the 3500 series modules in action
> > > > > (3522 for the VCF) on the Argo demo...Sorry about the
> > > > > crap playing.. :)
> > > > >
> > > > > Pic
> > > > > http://www.ele4music.com/pics/argo_01.jpg
> > > > > Mp3 - 3 parts soft square/ hard saw/ noises.
> > > > > http://www.ele4music.com/pics/argo_1.mp3
> > > > >
> > > > > Regards
> > > > > Tom
> > > > >
> > > > >
>