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Old 09-03-2013, 07:54 PM
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Default MPA Rev A Assembly Instructions and Specs

Note: Information in this thread applies only to the Rev A MPA sold before the update to Rev B in 2010. For Rev B documentation, see the documentation index.



MPA Rev A Assembly Instructions

Important Information
  • Mount components correctly. This kit contains an electrolytic capacitor, part C7. If parts C7 or D2 are installed backwards, C7 could explode during operation. The voltage regulator, part IC3, can become extremely hot if installed backwards.
  • Do not exceed the specified electrical limits of the device. Placing too great a load on the MPA's outputs or exceeding the specified supply voltage can cause excessive heating and could damage the device.
  • Do not apply external voltages to the MPA's 5V output, Digital Logic Outputs, or MIDI THRU ports. This will cause excessive heating and will damage the MPA.
  • This kit contains some ESD-sensitive parts. Please take reasonable static-control precautions when assembling the kit.

PCB Layout

The location of each part is clearly marked on the MPA circuit board.


MIDI Wiring

Wire pins 4 & 5 of the MIDI connector to the corresponding terminals of the MIDI In port. If installing a MIDI Thru connector, wire pins 2, 4, and 5 to the corresponding terminal of either MIDI Thru port. MIDI connector pin numbering is described here.

To chain multiple MPA units together, MIDI connectors are not required—wire terminals 4 & 5 of either MIDI Thru port directly to the corresponding MIDI In terminals on the next MPA unit in the chain.

Parts List

All components are mounted on the side of the board with the white legend. Components can be mounted in any order, but it is easier to mount the smallest components first.
  • C1-C6

  • C7

    Positive end of capacitor has an indentation, and negative end is marked with arrow. Positive end must match the "+" symbol on the circuit board legend.
  • D1

    Dark band on diode must match the white band on the circuit board legend.
  • D2

    White band on diode must match the white band on the circuit board legend.
  • IC1

    Mount socket on circuit board first, then insert IC into socket. Notched end must match notch in the circuit board legend.
  • IC2

    Mount socket on circuit board first, then insert IC into socket. End marked with dot must match notch in the circuit board legend.
  • IC3

    Pin 1 is on the left in the photo. Pin 1 must match dot on the circuit board legend. Before mounting permanently, bend the leads so that the IC "leans" into the open space on the circuit board.
  • IC4

    Logic IC, 74HCT14. Mount socket on circuit board first, then insert IC into socket. Notched end must match notch in the circuit board legend.
  • IC5, IC6

    Digital Potentiometer IC, MCP42xxx. Mount socket on circuit board first, then insert IC into socket. Notched end must match notch in the circuit board legend.
  • LED1, LED2

    The short lead must match the flat side on the circuit board legend.
  • R1, R2

    1kΩ resistor, marked with the following color bands: brown, black, red, gold.
  • R3-R7

    220Ω resistor, marked with the following color bands: red, red, brown, gold.
  • R8-R12

    10kΩ resistor, marked with the following color bands: brown, black, orange, gold.
  • RN1

    Pin 1 (marked with a dot) must be inserted in the small box on the circuit board legend.
  • SW1

    Numbers on switch should match numbers on circuit board legend.

Last edited by John; 09-03-2013 at 08:28 PM.
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Old 09-03-2013, 08:17 PM
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Default MPA Rev A Specifications

MIDI-Controlled Potentiometers
  • Nominal variable output resistance: 0 - 10 kΩ, 0 - 50 kΩ, or 0 - 100 kΩ; 128 steps
  • Maximum output resistance: nominal value +/- 30%
  • Maximum wiper current: 1 mA
  • Approximate wiper resistance: 100 Ω (MPA-10k); 500 Ω (MPA-100k)
  • Minimum voltage on potentiometer terminal: 0 V
  • Maximum voltage on potentiometer terminal: 5 V

MIDI-Controlled Digital Logic
  • Maximum source/sink current per output: 25 mA

Power Requirements
  • Minimum input voltage: 7.5 VDC
  • Maximum input voltage: 12 VDC
  • Input current (no load on Digital Logic Outputs or Regulated 5V Output): 70 mA
  • Input current will increase as loads are placed on Digital Logic Outputs & Regulated 5V Output.

Regulated 5V Output
  • Maximum output current: 200 mA
  • Heat sink should be attached to voltage regulator (IC3) when loading the Regulated 5V Output.

Dimensions
  • 76 x 74 x 25 mm (3.0 x 2.9 x 0.5")
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