[sdiy] voltage-controlled AM radio tuning

[David G. Dixon]

This may sound kinda silly, but I built one of Ray Wilson's circuits with a
thermal noise generating transistor, but I left the collector wire attached.
I picked up all sorts of radio signals on it, which made for some very
interesting noise indeed!

David G. Dixon
Professor
Department of Materials Engineering
University of British Columbia
309-6350 Stores Road
Vancouver, B.C. V6T 1Z4
Canada
 
Tel 1-604-822-3679
Fax 1-604-822-3619
 
"PERFECTA FINGAMUS SERVIAT NATURA"
 
The information in this email and in any attachments is confidential and
intended solely for the attention and use of the named addressee(s).  It
must not be disclosed to any person without the writer's authority.  If you
are not the intended recipient, or a person responsible for delivering it to
the intended recipient, you are not authorized to and must not disclose,
copy, distribute, or retain this message or any part of it.

> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-
> bounces at dropmix.xs4all.nl] On Behalf Of Tony Rolando
> Sent: Sunday, March 15, 2009 12:18 PM
> To: sdiy
> Subject: Re: [sdiy] voltage-controlled AM radio tuning
> 
> I had been wanting to do a VC-radio as a euro rack module. I've got a
> whole bag of varactors to test/ experiment with... not had time yet. In
> any case, I thought I'd mention this IC, because it would be pretty
> simple to VC, however looks like FM only and expensive:
> 
> http://www.futurlec.com/cgi-bin/search/qty_price.cgi?part_no=TDA7000
> 
> Available though, and it might be a pretty quick way to get something
> like this going!
> 
> Tony
> 
> 
> 
> 
> 
> alfred.pear at gmail.com wrote:
> > anyone here ever endeavor to create a voltage-controlled tuning
> > mechanism that spanned the Medium Wave/AM band?
> >
> > i am concerned that a varactor will not provide sufficient range..
> >
> >
> > -a
> > _______________________________________________
> > Synth-diy mailing list
> > Synth-diy at dropmix.xs4all.nl
> > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >
> >
> 
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy