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 Forum index » DIY Hardware and Software » Circuit Bending
cv am/fm module?
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bbow73



Joined: May 11, 2009
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Location: Virginia USA

PostPosted: Fri May 29, 2009 7:58 am    Post subject: cv am/fm module? Reply with quote  Mark this post and the followings unread

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
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PostPosted: Fri May 29, 2009 11:44 am    Post subject: Reply with quote  Mark this post and the followings unread

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 Cool
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Lorenzo



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Location: Trieste - Italyjstan

PostPosted: Fri May 29, 2009 1:24 pm    Post subject: Re: cv am/fm module? Reply with quote  Mark this post and the followings unread

...
Last edited by Lorenzo on Sun Aug 02, 2009 8:21 am; edited 1 time in total
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bbow73



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PostPosted: Fri May 29, 2009 1:29 pm    Post subject: Reply with quote  Mark this post and the followings unread

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
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PostPosted: Fri May 29, 2009 2:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

In the seventies there were radios that had presets working with potentiometers, such a radio would need very little modification likely.
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bbow73



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PostPosted: Wed Jul 01, 2009 7:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

does anyone have any tips on finding a radio that uses a pot for the tuner?
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bbow73



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PostPosted: Fri Jul 03, 2009 5:51 am    Post subject: Reply with quote  Mark this post and the followings unread

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



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PostPosted: Mon Jul 13, 2009 9:46 am    Post subject: Reply with quote  Mark this post and the followings unread

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
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PostPosted: Mon Jul 13, 2009 10:19 am    Post subject: Reply with quote  Mark this post and the followings unread

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.

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Blue Hell
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PostPosted: Mon Jul 13, 2009 10:23 am    Post subject: Reply with quote  Mark this post and the followings unread

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?

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bbow73



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PostPosted: Mon Jul 13, 2009 7:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

there are some Akai radios that use varactor tuners.
the are pretty cheap on ebay.

I found this:
http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/varactor.html

I wonder if it would be easier for a tech to build a tuner circuit or repurpose an existing radio?
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Blue Hell
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PostPosted: Tue Jul 14, 2009 9:09 am    Post subject: Reply with quote  Mark this post and the followings unread

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.

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bbow73



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PostPosted: Sun Aug 02, 2009 5:40 am    Post subject: Reply with quote  Mark this post and the followings unread

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
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PostPosted: Thu Jul 21, 2011 5:11 am    Post subject: Reply with quote  Mark this post and the followings unread

Voltage Controlled FM Radio based on Standard FM receiver with a wider tuning range of 70-110 MHz...
http://nomeist.com/voltage-controlled-fm-radio-cv-radio/274
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bubzy



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PostPosted: Fri Jul 22, 2011 1:44 am    Post subject: Reply with quote  Mark this post and the followings unread

hook a motor up to the dial and vc that Very Happy
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jean-louise



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PostPosted: Fri Nov 18, 2011 7:13 am    Post subject: Reply with quote  Mark this post and the followings unread

maybe this could be interesting: http://electro-music.com/forum/topic-50583.html

cheers
jan
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