GRINCH Controller Assembly Instructions

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Board Assembly

Assembling the GRINCH should be fairly easy for most hobbyists. The following sequence of steps is by no means the only way to do this. It is simply a suggested order of events to achieve the desired goal.

  • Start by checking the PCB over for any production faults. Ensure that none of the tracks are shorted or open and that all holes are clear.

Grinch Assy Step 1.jpg

  • Install the four 0.1uF capacitors (PN# 581-SA105E104Z). These capacitors have no polarity to worry about.

Grinch Assy Step 2.jpg

  • Install the power LED (PN# 604-WP7104GC). The LED must be oriented correctly, if your LED has a flat side then match that to the overlay on the PCB. If not, then the shorter lead of the LED is the cathode and will go in the square solder pad.
  • Install the power LED resistor (PN# 660-CF1/4C471J). Make sure that the resistor has a value of 470ohms (yellow/violet/brown/gold stripes). The resistor has no polarity to worry about.

Grinch Assy Step 3.jpg

  • Install the power connector at J2 (PN# 538-70543-0001). The square pad signifies the +5 VDC connection.
  • Install the 2 pin vertical header at J1 (PN# 538-22-03-2021).

Grinch Assy Step 4.jpg

  • Install the four 24 pin IC sockets (PN# 571-3902618). The sockets must be all aligned in the same direction with pin 1 of each socket aligned with the square solder pad. Another way to verify that you installed them correctly is that the notch on the top of each socket will be toward the RJ45 IN/OUT connections.

Grinch Assy Step 5.jpg

  • Install the 18 RJ45 jack sockets (PN# 571-5520251-4). Due to minor variations in manufacturing, some RJ45 sockets are a tighter fit than others. Care should be taken to ensure that the pins are aligned first before applying too much pressure to seat the locking lugs through the board.

Grinch Assy Step 6.jpg

  • Install the ICs into the IC sockets. Ensure that pin 1 of the IC is aligned with pin 1 of the socket. Can be verified by noting that the notch on the IC is aligned with the notch on the socket.

Grinch Assy Step 7.jpg

CONGATULATIONS! You have finished your GRINCH controller board.

Parts Listing (BOM)

The parts List for the GRINCH is fairly basic.

(Mouser PN# unless noted)
. 1 . GRINCH PCB V1.0 - available from wjohn
571-5520251-4 18 RJ45 IN
RJ45 A-O
RJ45-8/8 right angle sockets
538-22-03-2021 1 J1 Molex .100 KK. Vertical Header 2 Pin
649-65474-002LF 1 . FCI Bergcon PCB shunt (jumper)
538-70543-0001 1 J2 Molex SL connector Vertical Header 2 Pin
538-50-57-9402 1 . Molex SL Connector Vertical Plug 2 Pin
Plug to mate with the above connector
538-16-02-0102 2 . Molex SL Connectors Female
Pins for the above plug
581-SA105E104Z 4 C1 – C4 Axial Ceramic 50V 0.1uF
604-WP7104GC 1 LED Green LED 3 mm
660-CF1/4C471J 1 RLED 470 Ohm 1/4 Watt Resistor
571-1-390261-8 4 . 24 Pin IC Socket
(non-Mouser PN#)
4 U1 – U4 IC Available from King Electronics
(non-Mouser PN#)
. . Alternative IC chip available from Allegro follow the link to the Allegro request a sample page, find A6279EA-T (6th in the table) and order 4 (max is 6).

Here is the list in Mouser BOM format;


The PCB is available from wjohn on the Forum.

The main wiki page for The GRINCH Controller