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bbow73
Joined: May 11, 2009 Posts: 19 Location: Virginia USA
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Posted: Fri May 29, 2009 7:58 am Post subject:
cv am/fm module? |
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Hi, I don't know if this is the right place for this...
I was wondering if any has ever done an AM/FM transistor radio and routed the tuner to CV? It seems simple but could be a great noise source. I'm thinking S/H, fast or slow would be really wild.
Anyone ever heard of anything like that? |
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blue hell
Site Admin
Joined: Apr 03, 2004 Posts: 24079 Location: The Netherlands, Enschede
Audio files: 278
G2 patch files: 320
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Posted: Fri May 29, 2009 11:44 am Post subject:
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The only thing I ever saw coming close was this organ keyboard where each key switched a small transistor radio on or off, that one was was definitely fun. Your idea seems doable too, given the right radio _________________ Jan
also .. could someone please turn down the thermostat a bit.
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Lorenzo
Joined: Nov 09, 2008 Posts: 375 Location: Trieste - Italy
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Posted: Fri May 29, 2009 1:24 pm Post subject:
Re: cv am/fm module? |
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... Last edited by Lorenzo on Sun Aug 02, 2009 8:21 am; edited 1 time in total |
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bbow73
Joined: May 11, 2009 Posts: 19 Location: Virginia USA
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Posted: Fri May 29, 2009 1:29 pm Post subject:
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there was some talk of this on another thread, but as a dual or quad module.
Still looking for a tech that could make one of these. |
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blue hell
Site Admin
Joined: Apr 03, 2004 Posts: 24079 Location: The Netherlands, Enschede
Audio files: 278
G2 patch files: 320
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Posted: Fri May 29, 2009 2:22 pm Post subject:
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In the seventies there were radios that had presets working with potentiometers, such a radio would need very little modification likely. _________________ Jan
also .. could someone please turn down the thermostat a bit.
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bbow73
Joined: May 11, 2009 Posts: 19 Location: Virginia USA
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Posted: Wed Jul 01, 2009 7:40 pm Post subject:
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does anyone have any tips on finding a radio that uses a pot for the tuner? |
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bbow73
Joined: May 11, 2009 Posts: 19 Location: Virginia USA
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Posted: Fri Jul 03, 2009 5:51 am Post subject:
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I recently was told that there is a challenge with shielding vs reception.
The shielding required prevent the radio signal from bleeding into the synth also prevents the radio from receiving any signal.
How is this addressed in similar electronic systems that incorporate a tuner, such as a home stereo unit with tuner, CD player, cassette, etc? |
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bbow73
Joined: May 11, 2009 Posts: 19 Location: Virginia USA
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Posted: Mon Jul 13, 2009 9:46 am Post subject:
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after a quick google search of "voltage controlled capacitor"
I found that a 'varactor diode' circuit can adjust capacitance via CV.
anyone have any experience with this? |
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blue hell
Site Admin
Joined: Apr 03, 2004 Posts: 24079 Location: The Netherlands, Enschede
Audio files: 278
G2 patch files: 320
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Posted: Mon Jul 13, 2009 10:19 am Post subject:
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bbow73 wrote: | I recently was told that there is a challenge with shielding vs reception.
The shielding required prevent the radio signal from bleeding into the synth also prevents the radio from receiving any signal.
How is this addressed in similar electronic systems that incorporate a tuner, such as a home stereo unit with tuner, CD player, cassette, etc? |
You can just shield it, provided you have an external anrenna. Still I'm not sure if any extra shielding would be needed, as a decent radio would already have its HF parts shielded. _________________ Jan
also .. could someone please turn down the thermostat a bit.
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blue hell
Site Admin
Joined: Apr 03, 2004 Posts: 24079 Location: The Netherlands, Enschede
Audio files: 278
G2 patch files: 320
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Posted: Mon Jul 13, 2009 10:23 am Post subject:
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bbow73 wrote: | after a quick google search of "voltage controlled capacitor"
I found that a 'varactor diode' circuit can adjust capacitance via CV.
anyone have any experience with this? |
Varactor or varicap, both words are being used. I've no experience using these devices myself, but it would require some knowledge to build a decent radio with them. IMO it would be best to try to find an old one using a varactor ... maybe google could be of some assistance here, but ... don't know .. I'd have to open up a radio to see what technology it actually uses ... not sure if modern tuners would still use this technology ... maybe one of the hams here could say more about this? _________________ Jan
also .. could someone please turn down the thermostat a bit.
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bbow73
Joined: May 11, 2009 Posts: 19 Location: Virginia USA
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blue hell
Site Admin
Joined: Apr 03, 2004 Posts: 24079 Location: The Netherlands, Enschede
Audio files: 278
G2 patch files: 320
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Posted: Tue Jul 14, 2009 9:09 am Post subject:
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bbow73 wrote: |
I wonder if it would be easier for a tech to build a tuner circuit or repurpose an existing radio? |
I'd say the latter ... the circuits you pointed to are just illustrations, a radio would need quite a bit more ... the simplest possible thing would be something like : http://www.oddmix.com/tech/pdf/cr_varactor_crystalset.pdf but that would not be very selective and not very sensitive. _________________ Jan
also .. could someone please turn down the thermostat a bit.
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bbow73
Joined: May 11, 2009 Posts: 19 Location: Virginia USA
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Posted: Sun Aug 02, 2009 5:40 am Post subject:
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I found a guy name Paul Sop that makes a CV radio module.
His tuner is CV controlled by something called a stepper motor.
some of his other modules look pretty wild.
http://paulsop.googlepages.com/home |
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furio
Joined: Dec 25, 2009 Posts: 106 Location: Austria
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bubzy
Joined: Oct 27, 2010 Posts: 594 Location: United Kingdom
Audio files: 64
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Posted: Fri Jul 22, 2011 1:44 am Post subject:
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hook a motor up to the dial and vc that |
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jean-louise
Joined: Apr 27, 2009 Posts: 73 Location: berlin
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