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DIY Stompboxes => Building your own stompbox => Topic started by: Kurdt_01 on March 21, 2004, 05:32:30 AM

Title: LO - FI
Post by: Kurdt_01 on March 21, 2004, 05:32:30 AM
Can someone please post a link for a schematic for a LO - FI pedal (pref not to hard to build)

Thanks

Dave
Title: LO - FI
Post by: smoguzbenjamin on March 21, 2004, 05:35:19 AM
I think there's one at Tim Escobedo's site, sortof makes you guitar sound like it's being played through a phone. I find it a very cool effect for vocals: http://www.geocities.com/tpe123/folkurban/fuzz/snippets.html#lofomofo

Check that out. :)
Title: LO - FI
Post by: Kurdt_01 on March 21, 2004, 05:49:47 AM
Thanks your a star
Title: LO - FI
Post by: R.G. on March 21, 2004, 09:54:59 AM
See also the lo-fi pedal at geofex. It includes the telephone filtering as well as noise to add in.
Title: LO - FI
Post by: brett on March 21, 2004, 07:17:56 PM
Hi.  Tim E's LoFoMoFo certainly gives very Lo Fi.  Partly because the input cap filters LOTS of bass.  I found the sound too thin for my liking.  But with a change of the input cap (from memory I think 220uF to 2n2??) it sounded great.  Kinda medium fidelity.  

cheers
Title: LO - FI
Post by: cedric on March 22, 2004, 08:09:31 AM
Quote from: R.G.See also the lo-fi pedal at geofex. It includes the telephone filtering as well as noise to add in.

if i remember correctly that schem doesn't work.
Title: LO - FI
Post by: mattv on March 22, 2004, 10:20:44 AM
Quote from: cedricif i remember correctly that schem doesn't work.

To make it work, the wiper of the PANNER pot needs to be connected to Vb rather than ground. No big deal.
Title: LO - FI
Post by: keninverse on March 22, 2004, 12:51:11 PM
Don't see a voltage source on the schem...Vb is just 4.5V right?  can I just divide down using resistors?
Title: LO - FI
Post by: smoguzbenjamin on March 22, 2004, 01:13:31 PM
2 10k resistors should work fine as a voltage divider.
Title: LO - FI
Post by: mattv on March 22, 2004, 02:14:39 PM
I used the typical two-resistor-and-a-cap voltage divider, as Benjamin suggested, making 'Vb' 4.5V.

Also, I used the noise source from http://www.paia.com/drumtone.gif (transistor and op-amp in the bottom left hand corner) in place of the two-transistor noise source specified. This was pointed out by Tim Escobedo. The difference, as far as I could tell, just made louder noise (which I preferred), and can be done other ways I'm sure..
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