CT3680 Development Board Kit

Qty	Item	Qty	Item
1	Bare PC board	1	Power jack
2	40-pin breakable header pin strips	1	330 ohm resistor
6	10K ohm potentiometers	1	Red LED
6	Potentiometer knobs	2	Momentary pushbutton switch
11	Mini switches	10	Jumper blocks
8	Mono 3.5mm jacks	4	Rubber pad feet
1	Stereo 3.5mm jack	1	CT3680 Module & Reference Card

 

 

Assembly

1.      Verify kit contents (see list above), then do the following steps to assemble the board. We recommend this sequence which builds from the shortest components to the tallest.

2.      Note the serial number that is written on the back of your CT3680 module. This may be needed for future support purposes but will be hidden once the module is mounted on the PCB. We recommend writing the SN somewhere on the development board PCB with a permanent marker.

3.       Solder CT3680 module.

a.      Position the module carefully on the board using the silkscreen outline as a guide. Be sure to note the correct orientation of the module using the pin-1 orientation indicator. Be sure the half-hole vias on the edge line up equally with the pads on both sides of the board (a good magnifying glass, microscope, or jewelers loupe are useful).

2. Use a bit of tape or rubber bands to keep the module in position while the first one or two connections are soldered. Then the tape can be removed to solder the remaining connections.
3. Use a fine-tip soldering iron to heat the pad, melt some solder into the half-hole and on the pad, then drag the tip away along the pad to make a good fillet of solder connecting the module to the board.
   

 

4.      Solder header pins (63 total). Locations are shown circled in red in the board diagram above. (Do not solder header pins into switch locations shown in yellow).
► Use a rubber band to hold header strips in place while soldering from the back side.
► Solder the after all the strips are done, turning the board over to hold the pin in place while soldering on the back side.
When done soldering, check that all pins are straight and vertical to the board

5.      Solder the (4) PROGRAM SELECT, (5) OPTIONS, and (1) POWER mini switches in the locations circled in yellow in the board diagram above. Orientation does not matter.
► Like the header pins, a rubber band around the board can hold switches in place while soldering from the back side.
► Solder 1 pin of each switch, then remove the rubber band. Reheat the pin and seat the switch into position, then solder the remaining switch leads.
► After soldering, slide each switch back and forth a few times to clean the contacts.

6.      Solder the resistor (R1) and red LED (POWER) in the power section. Be sure to note the orientation of the LED, it has a flat side to match the outline on the board.

7.      Solder the (2) pushbutton switches, TAP and SYSTEM RESET.

8.      Solder (8) mono 3.5mm jacks at INTPUTS 1-4 and OUTPUTS 1-4.
► Install 4 jacks in a row at a time. Insert the jacks and wrap the board with a rubber band to hold them in place. The band may not hold them exactly in place or tight to the board, that is OK. Lightly solder only 1 pin of each jack. Remove rubber band, then on each jack re-heat the soldered pin and press the jack properly into place and alignment. Now fully solder all pins of all the jacks.
► Use a larger soldering iron tip for the large solder lugs of the jacks.

9.      Install stereo jack 3/4 STEREO using the same technique as the mono jacks.

10.  Install the 5V power jack.

11.  Install the (6) DELAY potentiometers. Insert the 3 signal legs, squeeze the side tabs and push down to clip the pot into the board. Check that the 3 signal pins are in the holes and slightly projecting from the back side of the board. Solder the 3 signal pins and 2 support tabs on each potentiometer. Use a larger soldering iron tip for the support tabs.

12.  Press-on the DELAY potentiometer knobs. The kit may have 2 different colors of knobs (2 of color A, 4 of color B). If so, use color A for DELAY MIN and DELAY MAX, and color B for DELAY 1, 2, 3, and 4.
► For proper registration (orientation) of the knob, rotate the pot fully counterclockwise, align the knob pointer with the lower-left corner of the pot body, then press the knob on the shaft. It can take some force to fully seat the knob (it may or may not �snap� in).
► Check that all knobs are fully seated, the skirt of the knob should come down to the body of the pot:

13.  Install the rubber feet on the back of the board by peeling them from the sheet and pressing them on as close to the 4 corners as possible (avoid placing on top of any component pins).

 

Completed CT3680 Development Board

 

 

 

Development Board Testing

1.      Set switches as follows (as in photo):

a.      POWER : OFF

b.      OPTIONS 1-5 : HI

c.      PROGRAM SELECT 1,2,4,8 : HI (This selects program #15 which is used for testing)

2.      Set header jumpers as follows (as in photo):

a.      LINK section : Connect center pin and upper (PRIMARY) pins on left header, connect center pin and 1 CH on right header.

b.      SYSTEM section: Connect center pin and upper (1) pins of both headers for 48kHz sampling rate.

c.      CV DELAY POS: Connect all sets of 2 pins (left-right pairs)

d.      No other header jumpers should be installed.

3.      Verify your power cable before connecting:

a.      2.1mm center pin, 5.5mm outer ring

b.      +5V DC

c.      Center pin of the power connecter positive (+), outer ring negative (-)

4.      Connect your power cable to the POWER jack and turn the POWER switch ON.

5.      Observe red LED POWER light is on, and a white LED on the module is flashing. This verifies the system is powered and running properly.

 

See the online CT3680 Reference for more information about using the development board:

https://cabintechglobal.com/ct3680-ref