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DIY Stompboxes => Building your own stompbox => Topic started by: Tony on September 08, 2004, 09:13:17 AM

Title: I made a radio?
Post by: Tony on September 08, 2004, 09:13:17 AM
Hi,

I put together an oscillator with a ring mod and found it picked up a radio station... How do you remedy that?

I might just keep it that way for my own use.

Thanks,
Tony
Title: I made a radio?
Post by: markr04 on September 08, 2004, 12:24:42 PM
Off the top of my head, I suggest shielding it with copper.
Title: I made a radio?
Post by: RDV on September 08, 2004, 02:37:50 PM
Try a small value cap to ground on the input. Just remember if you go to large you'll cut highs along with the RF.

RDV
Title: I made a radio?
Post by: bazzwazzle on September 08, 2004, 07:09:37 PM
Quote from: RDVTry a small value cap to ground on the input. Just remember if you go to large you'll cut highs along with the RF.

RDV

what would you consider a good value to start with.
Title: .
Post by: petemoore on September 08, 2004, 07:21:15 PM
.001uf-.0047uf
Title: Radio
Post by: Tony on September 08, 2004, 07:31:32 PM
Thanks for the info, I'll give it a try. Thanks.
Title: I made a radio?
Post by: Paul Perry (Frostwave) on September 08, 2004, 08:35:03 PM
I just had a vision.. a radio in a wah case, you tune it by foot!! could be a good party trick, tune around & then play along!! I'd pay to see that! (once..)
Title: I made a radio?
Post by: bazzwazzle on September 08, 2004, 09:20:02 PM
Quote from: Paul Perry (Frostwave)I just had a vision.. a radio in a wah case, you tune it by foot!! could be a good party trick, tune around & then play along!! I'd pay to see that! (once..)

ya and then you have a switch to go back to normal and use the wah again normally. Sweeeeeeeet... :D
Title: I made a radio?
Post by: Paul Perry (Frostwave) on September 09, 2004, 02:35:47 AM
There are different ways of tuning FM radios, but at one stage they were controlled by a pot generating a control voltage that changed the capacitance of a varactor diode (a reverse biassed diode with an inbuilt capacitance that changes from 3 to 20 pf or so). Then therr are digital ones with an up/down autoseek..
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