[RE: Synthacon weirdy filter]

[M.Ruberto]

thanks! looking at the flat side it's a ECB, which is what i thought from
looking at the way it was hooked up. i even drew it this way in the rough i
drew last night. i had to be sure though before i drew a nicer version up for
the web. this 5138 seems to be a bit of a pain to track down. i guess i'll
have to go by intuition on it and risk pissing off lots of people by getting
wrong. or i can breadboard it first with a 4403 in place of the 5138. there's
a plan. i won't get to this right away though because i'm very busy finishing
my moog filter clone at the moment. i should find time next week though, after
all, i'm dying to add the synthacons filter to my modular!
next i'll have to tackle it's VCO. i love the sound of it, but it's gonna be a
bitch to reverse enjineer with it's important trannies stuck in the metal bar
full of heat sink grease - DOH ;)

interesting thing about the filter - it consists of a mere 4 transistors. it's
like some bastard hybrid between a putney and a MS filter. someone will
definately need to give me a good explanation of it's operation.

-<mike>-


"Fahl, Romeo" <RFahl at extensis.com> wrote:
> 
> 
> You Rule!!!!
> 
> 
> I've been trying to get a schemo for that filter for ages.  
> 
> http://www.fairchildsemi.com/ds/2N/2N5172.pdf
> 
> has the pinout for the 5172.  Not familiar with the 5138, but I'll look for
> it.  If you have a National Semiconductor discrete component databook, it
> might be listed in there.
> 
> -----Original Message-----
> From: M.Ruberto [mailto:indridcold at usa.net]
> Sent: Thursday, November 30, 2000 1:33 PM
> To: synth-diy at node12b53.a2000.nl
> Subject: Synthacon weirdy filter
> 
> 
> hi all,
> 
> i am in the process of reverse enjineering the Synthacons weird filter. i
> have
> the schematic roughly drawn but to make a nice copy to put on the net i
need
> some pinout info. there are 2 transistors whos pinouts i can't find
> anywhere.
> they are the 2n5172 and the 5138. i think the 5138 is a jfet. anybody know
> these pinouts. 
> 
> the filter in this crazy synth rocks. i'll let you all know when the schemo
> is
> posted.
> 
> -<mike>-
> 
> http://indridcold.conk.com
> Synth-DIY Webring
> http://members.xoom.com/indridcold/signup.htm
> got Moog?
> 
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