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PMFoundations Clock Assembly Manual

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Clock v1.0 – Assembly Guide
Thank you for purchasing this module! This is an easy build with some precision integrated circuits.
Some of the pads are quite small and you will need a chisel tip or screwdriver tip soldering iron and
the skill to solder these tiny joints.
The module is designed and sized for Eurorack systems. You will need a 16-10 pin eurorack power
ribbon connector with –12/0/+12 which is connected to a synth power supply.
Follow the parts lists, these instructions and the PCB silkscreen text to build the module.
The module consists of 1 PCB board and a front panel.
You must follow the order of assembly as described below since some components will be soldered
underneath other components.
Page 1 of 10

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Summary of Contents for PMFoundations Clock

  • Page 1 Clock v1.0 – Assembly Guide Thank you for purchasing this module! This is an easy build with some precision integrated circuits. Some of the pads are quite small and you will need a chisel tip or screwdriver tip soldering iron and the skill to solder these tiny joints.
  • Page 2 Constructing the board 1. Resistors See the appendix for options before proceeding. Install the flat resistors on the TOP of the board. Solder and clip the leads. 2. IC Sockets Now Install the sockets on the TOP of the board. Observe the notch or mark on the sockets and align with the notch or mark on the board.
  • Page 3 Solder on the underside. 4. Ceramic/film/polypropylene capacitors With the capacitor values suggested in the BOM, the approximate clock frequencies are: HI: 1.35 Hz to 68 Hz LO: 0.1 Hz to 6 Hz DO NOT INSTALL C3, C4, C5. See the appendix for options before proceeding.
  • Page 4 5. Transistors Install the transistors on the TOP of the board. These are polarized components. Align the outline with the outline on the board. They should be raised off the board surface slightly and at the same height. Solder and clip the leads. 6.
  • Page 5 7. Trimmer resistor DO NOT INSTALL R16 unless you are modifying the standard design according to the appendix. 8. LEDs Install the LED on the TOP of the board and solder on the underside. The LED should face the edge of the board. (photo in section 11) 9.

  • Page 6: Voltage Tests

    12. Alignment 1. Place a washer over pot shaft. 2. Place the front panel over the board so that the pots and 3.5mm jacks align with the holes in the panel. 3. Put nuts on the jacks and pots and FULLY TIGTEN all of them. Do not overtighten! 4.

  • Page 7: Final Assembly

    1. You do not have to do these tests if you are completely happy with your soldering and are sure there are no bridges or incorrectly placed components. However, these tests will ensure that the correct power supplies are sent to the IC pins to ensure they will not be damaged on power 2.
  • Page 8 Page 8 of 10...

  • Page 9: Appendix 1: Build Options

    Range: C3-C6 set the HI range of the clock and C7-C11 set the LO range of the clock. Each range is determined by a bank of parallel capacitors equivalent to C(HI) and C(LO).

  • Page 10: Calibrating The Output Voltage

    LO: 0.1 Hz to 6 Hz Calibrating the output voltage If you have installed R16, connect the power supply and adjust the clock to a high frequency. Monitor the output of the clock on an oscilloscope. Alternatively, use a multimeter with the voltage set to a DC range that will read about 0-12V. Set the clock to a slow speed if using a multimeter.

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