[sdiy] Re: Source of 2N5459 FETs

[Steven Downhill]

>Hi,
>The FET's in that circuit are the selected ( orange) ones. 2n5459's have a
wide
>spec on pinch-off voltage. The orange ones are selected for a pinch-off of
5V or
>less, the yellow coded ones are the rejects. the 2n4392's will work well in
the
>4035 circuit as their pinch-off voltage is always less than 5V.

Thanks for the additional info.
Now that I know the above I've decided to go with the 2N4392s (I can get
these immediately for half the price of the 2N5459s and use them in some
other projects).

>The VCO I am referring to is the standard 4027-1 circuit used in 2600's .
Same
>circuit was used in Axxe and later Ody's.

I've looked at this schematic before and always wondered what the FETs were
as they're just labelled with (I assume) ARP's own part number.

I would love to be able to build my own ARP Odyssey or 2600 at some point in
the future.
Do you think that this could be done using the schematics / service manuals
from the Net and finding equivalent semiconductors to those which are now
obsolete?.

Regards
Steven

-----Original Message-----
From: Dana Scott [mailto:danas at egosys.com] 
Sent: 18 March 2004 11:50
To: Steven Downhill
Cc: synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] Re: Source of 2N5459 FETs


Hi,
The FET's in that circuit are the selected ( orange) ones. 2n5459's have a
wide
spec on pinch-off voltage. The orange ones are selected for a pinch-off of
5V or
less, the yellow coded ones are the rejects. the 2n4392's will work well in
the
4035 circuit as their pinch-off voltage is always less than 5V.
The VCO I am referring to is the standard 4027-1 circuit used in 2600's .
Same
circuit was used in Axxe and later Ody's.
-Dana

----- Original Message ----- 
From: "Steven Downhill" <Steven.Downhill at brother.co.uk>
To: "'Dana Scott'" <
Cc: <synth-diy at dropmix.xs4all.nl>
Sent: Thursday, March 18, 2004 4:21 AM
Subject: RE: [sdiy] Re: Source of 2N5459 FETs


> Hi Dana,
>
> >What are you building? If you are building ARP VCO circuit, you will have
> better
> >luck using a 2n4392. It does come  in a metal can instead of a plastic,
> tho'.
> >-Dana
>
> The plan was to use them in the ARP 4035 VCF (assuming the below schematic
> is OK).
>
> http://www.arptech.synth.net/pdf/4035.pdf
>
> Thanks for the info on the ARP VCO.
> Which version of it are you referring to?.
>
> Regards
> Steven
>
> -----Original Message-----
> From: Dana Scott
> Sent: 17 March 2004 17:45
> To: Steven Downhill; synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Re: Source of 2N5459 FETs
>
>
> What are you building? If you are building ARP VCO circuit, you will have
> better
> luck using a 2n4392. It does come  in a metal can instead of a plastic,
> tho'.
> -Dana
>
> ----- Original Message ----- 
> From: "Steven Downhill" <Steven.Downhill at brother.co.uk>
> To: <synth-diy at dropmix.xs4all.nl>
> Sent: Wednesday, March 17, 2004 9:31 AM
> Subject: [sdiy] Re: Source of 2N5459 FETs
>
>
> > Hi All,
> >
> > Does anybody know of a company in the UK with the exception of RS that I
> can
> > obtain 2N5459 FETs from?.
> > (RS seem the only company to have this part and they'll be out of stock
> for
> > the next 10 weeks!).
> >
> > Equivalent part suggestions are also welcome.
> >
> > Thanks.
> >
> > Regards
> > Steven



IMPORTANT NOTICE
The contents of this email are confidential and are for the exclusive use of
the intended recipient(s). If you are not the intended recipient(s) please
note that any form of distribution, copying or use of this communication or
the information in it is strictly prohibited and may be unlawful.

Please note that, although this email has been virus-checked, neither
Brother International Europe Ltd
nor the sender accepts any responsibility for viruses and it is your
responsibility to scan the email and attachments (if any).

If you believe you have received this communication in error, please return
it (with the title "received in error") to the sender then delete the email
and destroy any copies of it.
We would be grateful if you would also copy the communication to
ITHelpdesk at brother.co.uk

Please see www.brother.co.uk for more information