Radial Engineering EDU-DI Manuel
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© Radial Engineering , 1588 Kebet Way Port Coquitlam, V3C 5M5, British Columbia, Canada
EDU-DI True to the Music
1. RESISTORS: Start by placing the rst resistor (R1) in the
designated position. Bend the wire leads at 90 degree an-
gles to feed the leads through the board. Spread the wire
leads slightly to ensure the resistor stays in place. Solder
the leads from the bottom of the board, then clip the excess
wire leads. Repeat this for the remaining resistors R2-R5.
2. CAPACITORS: Place the rst capacitor (C1) in the as-
signed designation. There is no polarity so you may install
these in any direction. You do not need to bend the leads
to t, however after it’s been inserted you can bend the
wire slightly to secure in place. Solder the leads from the
bottom of the board and then clip the excess wire leads.
Repeat for C2.
3. PUSH SWITCH: Place the rst push switch (S1) in the as-
signed designation. Make sure it is facing outwards from
the board, ip the board over and ensure the switch is ush
to the board, then solder the 8 pins. You do not need to clip
the wire leads. Repeat for the remaining switches S2-S3.
REF QTY Description Color Code
R1 1 51R 1/4w 5% Gr, Br, Bk, Gd
R2 1 1K8 1/4w 5% Br, Green, Rd, Gd
R3 1 8K2 1/4w 5% Grey, Rd, Rd, Gd
R4 1 15K 1/4w 5% Br, Green, Or, Gd
R5 1 6K8 1/4w 5% Bl, Grey, Rd, Gd
C1 1 0.01uf 50v 10%
C2 1 22uf 25v 20%
S1-S3 3 PUSH SWITCH
Gr=Green, Br=Brown, Gd=Gold, Gry=Grey, Rd=Red, Bk=Black, Bl=Blue, Or=Orange
Tools Required
Side cutters
Philips #1 screwdriver
Philips #2 screwdriver
Nutdriver 7/16”
Soldering iron 25-40 watt and solder
Basic Instructions:
Inside you will nd all the parts required to build your own EDU-DI. Use this document to assist you as you begin to
build your own direct box.
Build Instructions
PCB Layout
Soldering Hints:
1. Mount the component against the
PCB surface and bend the wire
leads slightly.
2. Solder the wire leads from the bot-
tom, make sure the solder joints are
cone-shaped and shiny.
3. Trim excess wire leads as close as
possible to the solder joint.
T1
S1
R1
C1
J1
J3
S2
R5
C2
R2
R3
R4
J2
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© Radial Engineering , 1588 Kebet Way Port Coquitlam, V3C 5M5, British Columbia, Canada
4. ¼” TRS JACK: Place J3 in the assigned designation.
Make sure the hole is facing outwards from the board, ip
the board over and solder two leads on opposite sides
of the input jacks to hold it in place. Then apply pressure
while reheating the leads so the jack becomes ush with
the circuit board. Solder the rest of the pins. You do not
need to clip the wire leads for the jacks. Repeat this pro-
cess for J2.
5. TRANSFORMER: Place the Jensen transformer into the
T1 designation. Line up the dot on the transformer to the
dot on the circuit board, then ip it over and solder it in
the same way as the jacks. Solder two leads on opposite
sides, then apply pressure to the transformer while reheat-
ing the soldered leads so it becomes ush with the board,
then solder the rest of the leads. Use the side cutters to
clip the excess wire leads.
6. MOUNTING PCB: Before placing the PC board into the
metal insert, push the switches to the “IN” position to allow
more clearance and place two orange washers on each of
the jacks. Now you can position the PC board in place. Us-
ing the Philips #1 screwdriver, drive three of the rounded
Philips screws to attach the PC board with the metal.
7. XLR JACK: Position the male XLR connector into the J1
designation so the pins are in the slots, then slide it up
so the connector is ush with the metal. Now use the re-
maining two rounded philips screws to attach this to the
metal. Be careful not to overtighten the screws as you can
damage the threading on the XLR. To solder the pins into
the slots, ip the EDU-DI upside down and access the PC
board by the hole in the bottom of the metal. Heat up the
pin rst and then apply a fair amount of solder. Repeat this
for each pin.
8. SECURING TRS HEX-NUTS: Insert the two metal hex-
nuts into the two plastic black washers so the rounded
sides are facing outwards, then using your hands gently screw these into the jacks. Once they are positioned, you
can use the 7/16th nutdriver to tighten these (just past the tightness you can do with your ngers).
9. SWITCH BUTTONS: Push in the three beige push-on buttons. Align the beige buttons so that the square lines up,
then push it in rmly with either your ngers or a blunt object such as the end of screwdriver.
10. ASSEMBLY: Slide the metal insert into the metal wrapper. Ensure that the side of
the wrapper that says “LOW-Z OUT” is on the same side as the XLR, and that the
side that says “INPUT and “THRU” corresponds with the two jacks. Flip the EDU-DI
over, and drive the four Philips countersunk screws with the Philips #2 screwdriver.
11. NEOPRENE PAD: Place the non-slip pad on the bottom of the EDU-DI to prevent it
from sliding around on a stage or studio oor.
12. TEST: Test the EDU-DI by plugging in an instrument into the ¼” input and the XLR
output to a PA system or microphone preamp and begin playing. Activate the PAD
switch to hear the attenuation work correctly.
REF QTY Description
J1 1 XLR MALE JACK
J2-J3 2 TRS 1/4” JACK
T1 1 12:1 JT-DB-EPC TRANSFORMER
PCB 1 BARE PCB
Basic Instructions (Continued):
Line up the dot on the
transformer to the dot
on the circuit board.
T1
S1
R1
C1
J1
J3
S2
R5
C2
R2
R3
R4
J2
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