First
The Tim Overdrive is a pedal developed by Paul Cochrane. Although its only available on request (these pedals are still handmade only), its a very hyped and popular pedal.
The Timmy is a small version of the Tim, missing the Send/Return jacks and the boost section. So it only contains the OD section of the Tim.
The Timmy is an very transparent overdrive with 4 knobs for Volume, Drive, Bass and Treble.
Additionally it features a toggle switch to select different amounts of clipping diodes.
The Catch 22 is a project by Grind Customs FX (http://www.grindcustomsfx.com/).
It is a Timmy workalike, with some mods:
-) Internal Voltage pump charge from 9V to 18V for more volume and headroom
-) 3 different clipping options (on-off-on toggle switch)
-) Treble and bass control: Frequencies are increased when turning the pot up, not the either way round (no frequency cut controls as in the original, what is more logical)
Schematic
Note theres a little mistake in this schematic:
The Volume pot is 10kA (and NOT 100k as shown below)
Be careful when building the Catch22 project:
- If you want to put it in a 1590b enclosure, be very careful during drilling! The PCB fits exactly into an 1590b. Horizontally theres no space left!
- The Pots are placed very close vertically. That can cause a short-circuit when mounting the pots to the enclosure. You can use tape for the Drive and Volume pots to prevent this!
Drill Plan
Download the Drill Template here
My Build
The Volume pot must be 10kA. For my build I used a 25kA pot and soldered a 18k resistor between Lug 2 and 3.
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