Tone BenderThis is the Tonebender, one of the most iconic fuzz effects from the 60s.
Enclosure and wiring Step 4 of 5
Place the assembled PCB and the rest of the components (DC and 3.5 jack connectors, 9V battery clip, 3PDT foot switch, led...) in a metal enclosure. Connect the ground of the circuit to the enclosure in order to attenuate the noise (the GND of the input and output jacks are in contact with the enclosure). The following figure show the components mounted in the 1590B enclosure.
Snap off the anti-rotation tab on top of the potentiometers with a pair of flat nose spliers.
Use a 24 AWG stranded wire and connect all the elements as indicated in the following figure. No matter the order to connect the ground (GND) as far as all the components are connected. The diode led requires a current limiter resistor, you can use values in between 2.2k and 4.7k for regular leds. The following figure shows the wiring with a negative tip DC connector (standardized Boss style 2.1 mm with a negative tip orientation).
Wiring for PNP transistors (Positive ground) without DC jack
Wiring for PNP transistors (Positive ground) with DC jack
A positive ground pedal cannot be directly connected to the power supply in chain with your other negative ground pedals. You can use the Charge Pump PCB to build a voltage inverter and power your positive ground pedal in chain with the rest of your pedals.
Wiring for NPN transistors (Negative ground)
The PCB for 3PDT footswitch will help you to wire all the components, keep a neat circuit and reduce the noise. This PCB also includes pads for the led and its current limiter resistor.
If you are going to use a 1590B enclosure, this PCB will definitely help to build your pedal. Led, jacks, and footswitch are mounted on the PCB. You will only need to wire the battery clip and the effect PCB. Drilling templates are available in the attachments.
To connect the 1590BB enclosure PCB to the effect PCB you can use a 4 pin connector or solder the cables as indicated in the following figure. The PCB pins are marked as "GND" ,"+V", "FROM FX" and "TO FX". Connect "FROM FX" to the output of the effect PCB, and "TO FX" to the input of the effect PCB.
Place the voltage inverter (Charge Pump PCB) in the 1590B enclosure and wire as indicated in the following figure.