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Have Mercy
Building instructions
v2.2

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Summary of Contents for Lithium Grim Have Mercy

  • Page 1 Have Mercy Building instructions v2.2...
  • Page 2: Table Of Contents

    Have Mercy v2.2 Table of contents Main PCB layout ............................3 Components Main PCB ..........................4 Footswitch PCB ............................5 Build sequence ............................6 Calibrating to stock factory settings ......................7 Switch settings ............................7 Off board wiring ............................8 Modifications ............................
  • Page 3: Main Pcb Layout

    Have Mercy v2.2 Main PCB layout Dimensions: 52,5 mm x 130 mm 2.1 inch x 5.15 inch Manufacturers and product names are mentioned solely for circuit identification, and where applicable their trademarks are the property of their respective owners who are in no way associated or affiliated with the author. No cooperation or endorsement...
  • Page 4: Components Main Pcb

    Have Mercy v2.2 Components Main PCB Part Value Comment Part Value Comment SMF/MKT/FKP2 LED 5mm red SMF/MKT/FKP2 LED 5mm red Electrolytic 25V+ 1N270 Germanium Diode SMF/MKT/FKP2 1N270 Germanium Diode 470n SMF/MKT/FKP2 Zener 9.1V 470n SMF/MKT/FKP2 Zener 9.1V Electrolytic 25V+ Zener 10V...
  • Page 5: Footswitch Pcb

    Have Mercy v2.2 Footswitch PCB Part Value Comment Part Value Comment 390R MF0207 3PDT 390R MF0207 3PDT LED dependent 4PDT Akeys MSS-42D01 (Aliexpress) LED dependent Electrolytic 25V+ See below LED flange Electrolytic 25V+ See below LED flange R1, R2, C1, C2, SW3, VR1 and VR2 should be soldered to the topside. SW1, SW2, D1 and D2 should be soldered on the bottom side.
  • Page 6: Build Sequence

    Have Mercy v2.2 Build sequence Soldering this board can be very complicated for some people since the solder pads are very close together. Use a magnifying glass to make the job easier. The trick to soldering a PCB is to work from small to big components. My building sequence suggestions in this section are based on the parts I used myself.
  • Page 7: Calibrating To Stock Factory Settings

    Have Mercy v2.2 Calibrating to stock factory settings Once everything is connected, you should calibrate VR1 – VR4 to give you your optimum gain. VR1 (Gain Structure) : 100% (full clockwise/right) VR2 (Bias 1) : 50% (12 o’clock/middle) VR3 (Bias 2)
  • Page 8: Off Board Wiring

    Have Mercy v2.2 Off board wiring Off board wiring is very easy using the special designed Footswitch PCB. It fits a 9V battery however be warned that a depelting battery will not be able to deliver the 9V needed for the voltage doubler to work and produce 18V.
  • Page 9: Modifications

    Have Mercy v2.2 Modifications Transistors Q3, Q5, Q6 and Q7 are based on the BS170P as used in a lot of Zvex pedals. You can use the regular BS170 instead of BS170P but note that the pinout is in reverse! Soundwise they are exactly the same.
  • Page 10: Incorporating An Expression Pedal

    Have Mercy v2.2 Incorporating an expression pedal There are 2 ways to incorporate an expression pedal. The first being as mentioned in the original pedal. The original adds a expressionpedal parallel to the gainpot in the pedal. This results in around 12.5k (25k // 25k // 2M2 = approx.
  • Page 11: Troubleshooting

    Have Mercy v2.2 Troubleshooting All PCB’s have been 100% factory e-tested and out of every batch I receive I build an effect to double check, so there should not be a connection problem on the PCB itself. The board is not working (at all), what now? •...
  • Page 12: Schematic

    Have Mercy v2.2 Schematic Manufacturers and product names are mentioned solely for circuit identification, and where applicable their trademarks are the property of their respective owners who are in no way associated or affiliated with the author. No cooperation or endorsement...

Table of Contents