Building the Stomper 1U Tile

SCHEMATIC:

PCB:

BOM:

Qty
Value
Device
Package
Parts
Description
1100kRESISTOR R0805R13
3100nCAPACITOR C0603C41, C42, C48Non-Polarized capacitor.
110kRESISTOR R0805R46
110nCAPACITOR C0805C50Non-Polarized capacitor.
115kRESISTOR R0805R47
21kRESISTOR R0805R42, R50
51uCAPACITOR C0805C43, C44, C45, C46, C47Non-Polarized capacitor.
14k7RESISTOR R0805R43
1 LED LED3MMLED5LED
1DIODE-BAT54SDIODE-BAT54SSOT23D8Schottky Diodes
1HW-TILE-POWER-FUTABA-WITHLEADNARROW TILE-POWER-FUTABA-SMALL Tile Tail
2 THONKICONNTHONKICONN-MOD 3.5mm socket for Eurorack modular synths
2M7DIODEPOWERDO214AC 1N4007 equivalent
1MCP1702-5REGULATOR-MCP1702INLINETO92-INLINEIC10VOLTAGE REGULATOR. Be sure to get the MCP1702-5.
1TINY85-20-DIPIC-ATTINYTINY85-20-DIPDIP08U5Atmel 8-pin 2/4/8kB flash uC
1TL072IC-TL072SMTSO08IC9OP AMP
3b10kPOT9MM SNAP-INDURATION, FREQ, SHAPE9mm vertical snap-in pot, Alpha / Panasonic style with 6mm built-in knob.
1DIP 8 SOCKETSocket for 8-pin DIP IC

 

Assembly:

  1. Clean the PCB with Isopropyl Alcohol.
  2. Solder the surface-mount components to the PCB.
    1. The two diodes on the top left are M7 or 1N4007 rectifier diodes. Make sure the polarity is correct.
    2. The three small unlabelled footprints (0603 size) are 100n bypass capacitors.
    3. Pin 1 for the TL072 IC is by the large white dot.
  3. If using hot-air or an oven to solder the surface-mount components then do this now.
  4. Add the 8-pin DIP socket.
  5. Inspect all of the soldered components for solder bridges between pins and components, especially around the OpAmps.
  6. Solder the Tile-Tail power cable. The lead should be inserted on the component side of the PCB and soldered on the side with the jacks.
  7. Solder the jacks and pots to the front of the PCB.
  8. Attach the front panel.

Testing

  1. Inspect PCB for solder bridges between components, loose solder balls, tombstones, etc.
  2. Before powering the module for the first time ensure there are no power shorts. Check that there is no continuity between the pins on the power cable, and across the opamp bypass capacitors (unlabelled 0603 components).
  3. Apply power. Pin 8 (bottom right) on the IC socket should have 5 volts, plus or minus a few millivolts.
  4. Unplug power and add the microcontroller IC. Pin 1 has a dimple and should be in the top right corner.
  5. Turn power on and feed a trigger into the input. You should hear the kick sound and the controls should change the settings.