[sdiy] ARP 4027-1 VCO cloning?

[Harry Bissell Jr]

These ARE commercial values. If you want a good clone
buy these 1% from Mouser at $4.00 / 200 and use the
33.2K 1% in place of any 33K 5% or 10% you ever need.

No reason to use 5% parts anymore...

The ARP tempco values are another story, you either
need to buy that value, or redesign

H^) harry


--- Luís_Marka <luis.marka at terra.com.br> wrote:

> Hi,
> Actually I am referring to resistors like 1.65K,
> 8.87K, 30.1K, 1.37K, 61.9K,
> 84.5K, 45.3K and a 33.2K in parallel with a 3.3M -
> this, in my math, is
> 32.87K, right?
> Could I just use the closest commercial values
> available? If these resistors
> are that critical, I can just use series & parallel
> associations to get
> closer to the values in the schematics. Just wonder
> if someone already tried
> that, 'cause this would make the way to a working
> clone much easier.
> By the way, the schematics for the 4027-1 module are
> in
> http://www.oldcrows.net/arptech/modmain.htm (thanks,
> Scott!)
> 
> Seeya,
> Luis Marka
> 
> ----- Original Message ----- 
> From: <WeAreAs1 at aol.com>
> To: <rtellason at blazenet.net>;
> <synth-diy at dropmix.xs4all.nl>
> Sent: Wednesday, August 25, 2004 1:07 PM
> Subject: Re: [sdiy] ARP 4027-1 VCO cloning?
> 
> 
> >
> > In a message dated 8/25/04 8:02:41 AM,
> rtellason at blazenet.net writes:
> >
> > << I haven't seen a schematic of that part yet, 
> though I have downloaded
> > some
> >
> > ARP stuff off the 'net and haven't sorted it all
> out yet.  So I'm not sure
> >
> > what you refer to there about the resistor
> values... >>
> >
> > He might be referring to the 1.87K tempcos that
> ARP used in that module
> and
> > some of their other VCO's.
> >
> 
>