[sdiy] ASM-1 VCO LM311 Question

[Scott Bernardi]

2N4856

Looking from the TOP, flat side to the RIGHT
G
S
D


David Reichert wrote:

> 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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--
Scott Bernardi
sbernardi at attbi.com