[sdiy] ASM-1 VCO LM311 Question

[David Reichert]

While we're on the topic of the ASM-1 VCO, I'm having trouble with the
2N4856. I don't seem to be connecting it correctly. I can't find a data
sheet anywhere and have to idea which pin is which. I could figure it
out if it was a BJT, but for an FET I don't know how to go about it.

Can anyone help with this?

Thanks,
Dave

-----Original Message-----
From: owner-synth-diy at dropmix.xs4all.nl
[mailto:owner-synth-diy at dropmix.xs4all.nl] On Behalf Of harry
Sent: February 2, 2002 3:52 PM
To: patchell
Cc: Jaco Sloof NewbieSynthBuilder; SynthDIYmailinglist
Subject: Re: [sdiy] ASM-1 VCO LM311 Question

Hmmm ?  5 and 6 go to +15 ?

I usually tie 5 to 6 only.  I've never used 5 and 6 and the data sheet
says

to tie them together if they are not used. I'LL have to check the
data sheet.

H^) harry

patchell wrote:

>     If I remember correctly, on the LM311, Pin 1,4 need to go to -15,
> and 5,6,8 need to go to +15.  Pin 1, I seem to remember, is the
emitter
> of the output transistor.  In order to turn the discharge FET off, the
> output needs to go to a large negative voltage.
>
> Jaco Sloof NewbieSynthBuilder wrote:
>
> > Maybe obvious but i'll check N-E-way:
> >
> > Pin 1 of the LM311 goes to ground on the datasheet
> >
> > do i have to tie pin 1 to ground as well, in the ASM-1 VCO?
> >
> > Also, i detected an (non significant) error in the VCO schem pdf
> >
> > from pin 7 of the LM311, a resistor goes to ground, 3k3
> >
> > R18 to be precise, but this already exists:
> >
> > R18 from LM311 pin 2, to CA3140 pin 6...
> >
> > is this error of ehhh "hazard" to the VCO's workings?
> >
> > much thanx in advance, and greetings CJ Wacko Jacko
> >   _______
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