Tone Generation for debug/building

Frequently asked questions about tools and instruments used in stompbox development.

Tone Generation for debug/building

Postby Grathan » 05 Apr 2009, 18:01

Looking for some ideas since strumming a guitar while testing can be such a hassle.


hooking up an ipod that loops a recorded guitar signal?

This seems like it might work, but is the signal even ac? Is there a way to make this work so that the output of the effect being tested gives similar results like a true guitar signal?

what other methods can be used?
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Re: Tone Generation for debug/building

Postby lolbou » 05 Apr 2009, 18:04

Frequency generator? Some can be easy to do, but do not really sound like guitar strumming...
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Re: Tone Generation for debug/building

Postby Fuzzer » 05 Apr 2009, 22:41

Courtesy of RG Keen;

http://www.geofex.com/FX_images/q+dosc.gif

Other thing you can do is, if you have a delay capable of repeating a loop (DD-3 (hold), for example), that's your guitar signal generator.
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Re: Tone Generation for debug/building

Postby lolbou » 05 Apr 2009, 22:46

That's one I thought of fuzzer... I like this one too: http://www.nuxie1.com/guides/function-generator.html
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Re: Tone Generation for debug/building

Postby Grathan » 06 Apr 2009, 19:32

looks neat, of course I messed it up... :roll:


On the RG keen Twin Tee iscillator

1.) does this require 2 seperate 9v sources or can I just jumper the 9v+ hookups together?

2.) Is that a connection where the lines cross under the 4.7k?

3.) how do you hook this up?
Let's say I have an input and output wire from an effect I would like to run this signal through. Do I just take the 100mv lead and attach it to the input wire for the effect I wanna test out?
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Re: Tone Generation for debug/building

Postby Fuzzer » 06 Apr 2009, 20:01

1) No, that's the same voltage node, you only need one battery.

2)Yes, it is a connection.

3) Yes, that's it, the output goes to the amp; or you start testing with the audio probe connected to the amp if that's the case.
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Re: Tone Generation for debug/building

Postby earthtonesaudio » 13 Apr 2009, 17:08

If you have a scope, a couple things might prove useful:
A triangle wave will more clearly show distortion/asymmetry rather than a sine (which is already rounded at the top).
The option for symmetric/asymmetric waveform can prove useful when sorting out phase inversion.
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Re: Tone Generation for debug/building

Postby HydrozeenElectronics » 13 Apr 2009, 19:50

If you wanted to change the frequency of the RG Keen signal generator what parts would you change? like say if I wanted to had a couple switches so I could choose between three different tones.

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