FirstThe 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)
SchematicNote 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!