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Platypus9



Joined: 01/09/04
Posts: 134
Loc: Montreal, Canada
Resistor in cable: resistance value? new
      #589610 - 10/03/08 08:17 PM
I sometimes patch my radio into my mixer, but the signal is much too strong, and even when the channel is muted, I can still barely hear it (crosstalk?). I intend to make a custom cable with resistors to reduce the level, any idea of a starting value to try?
cheers,
Plat


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Teleute
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Joined: 17/08/03
Posts: 342
Re: Resistor in cable: resistance value? new [Re: Platypus9]
      #589888 - 11/03/08 03:20 PM
Use a 100K pot.

Live to pin one, earth to pin 3

feed Pin 2 and 3 to your mixer via a jack plag, turning the pot changes the volume from silnece to full.

If you want to do stereo then get a dual ganged pot.

http://www.maplin.co.uk/searchtemplate.asp?criteria=100K%20POTENTIOMETERmu ch

Much easier than trying hundresd of diffrent resistors till you get the right ones.

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Martin WalkerModerator
Watcher Of The Skies


Joined: 28/02/01
Posts: 17489
Loc: Cornwall, UK
Re: Resistor in cable: resistance value? new [Re: Platypus9]
      #589904 - 11/03/08 04:07 PM
Good advice from Teleute there, expect that I'd amend the value of the pot from 100K to 10K to minimise the chances of high-frequency loss.


Martin

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baxtermusic



Joined: 08/03/08
Posts: 5
Re: Resistor in cable: resistance value? new [Re: Martin Walker]
      #589963 - 11/03/08 06:50 PM
Not sure about wiring a pot into a cable though, although a mini trim pot - the type adjusted with a screwdriver rather than a knob - might fit into a roomy jack.

I go for the trim pot approach when I take the speaker outputs from circuit bent toys. I've thought about building a general purpose attenuator, a volume pot in one of those little plastic boxes with an in and out jack.

In his book Handmade Electronic Music, Nicolas Collins recommends 10k and 1k resistors to attenuate a hot signal to line-ish level. In his schematic the 10k one goes in series with the output and the 1k to ground. I've never tried this though.

I'm curious as to why the radio output is so hot anyway - surely a headphone/line out wouldn't overload a mixer?

Edited by baxtermusic (11/03/08 06:51 PM)


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James PerrettModerator



Joined: 10/09/01
Posts: 10719
Loc: The wilds of Hampshire
Re: Resistor in cable: resistance value? [Re: baxtermusic]
      #590214 - 12/03/08 10:09 AM
Quote baxtermusic:



I'm curious as to why the radio output is so hot anyway - surely a headphone/line out wouldn't overload a mixer?




That worries me too - are you trying to use a mic input or a record deck input?

Cheers

James.

--------------------
JRP Music - Audio Mastering and Restoration.
http://www.jrpmusic.net


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