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Stewart MacDonald bomb boost Assembly Instructions Manual

Classic pedal kit

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StewMac
BOMB BOOST
C L A S S I C
Assembly Instructions
The BOMB BOOST is a classic pedal created by JHS,
makers of high-end effects pedals. Whenever JHS
adds a new pedal to their line, they retire an existing
design. This means great JHS pedals like the BOMB BOOST
have become rare and sought-after. You can't buy one, but
you can build yourself one—and it's fun!
This BOMB BOOST KIT is the perfect entry into build-
ing your own pedals: an easy project without many parts.
If you've never assembled a pedal before, start right here!
This pedal is a 16dB JFET boost that will push a tube amp into
a clear, natural distortion. Use it in front of your overdrive,
distortion, and fuzz pedals for a thicker, more saturated tone.
Put it after your pedals to maintain your existing tone, but
make it louder (perfect for solos). Or keep it on all the time
to boost signal loss caused by long signal chains or by pedals
that aren't true bypass.
The original BOMB BOOST was a MINI version, housed in a
mini-sized case. For this kit, we've resized the original circuit
to fit a standard enclosure.
©2017 Stewart-MacDonald
Sheet #i-2151 Updated 1/17
P E D A L
K I T
page 1 of 10

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Summary of Contents for Stewart MacDonald bomb boost

  • Page 1 The original BOMB BOOST was a MINI version, housed in a mini-sized case. For this kit, we’ve resized the original circuit to fit a standard enclosure.
  • Page 2 A way to add custom graphics is to print them from your computer onto waterslide decal paper. If you use decals, protect them from scratches by spraying clear topcoats over them. stewmac.com ©2017 Stewart-MacDonald page 2 of 10...
  • Page 3 #4652 (2) Mono jacks, 1/4" #7422 (1) D8 Clear LED (5mm) #7460 (1) DC power connector (21MM) #7501 (1) Control knob (Not pictured) (1) Circuit board (Not pictured) #7551 (1) Metal case with 4 screws stewmac.com ©2017 Stewart-MacDonald page 3 of 10...
  • Page 4 The leads on diodes sometimes vary in diameter. If the leads don’t fit into OutJ the eyelets in the circuit board, trim them at a steep angle to create sharp points that fit into the holes. P78869 stewmac.com ©2017 Stewart-MacDonald page 4 of 10...
  • Page 5 Note that Q1 has a flat side. On the circuit board, the location outline also has a flat side. Install this transistor to match its outline .1J63 on the card. *JFET: Junction Gate Field-Effect Transistor VOLUME OutJ P78869 stewmac.com ©2017 Stewart-MacDonald page 5 of 10...
  • Page 6 Solder one lug and let it cool. This holds the switch in place while you solder the remaining lugs. Next, install the ribbon cable. Insert the cable leads through the front of the board, and solder them in place on the back. stewmac.com ©2017 Stewart-MacDonald page 6 of 10...
  • Page 7 Install the input and output jacks on the sides of the case. Keep the lugs facing up so you’ll have easy access when it’s time to solder them. stewmac.com ©2017 Stewart-MacDonald page 7 of 10...
  • Page 8 Insert the LED into the bezel. It will be held in place by soldering it to the switch circuit board in Step 11, but for a more secure mount you can run a bead of clear silicone adhesive around the LED and bezel. stewmac.com ©2017 Stewart-MacDonald page 8 of 10...
  • Page 9 VOLUME This pedal requires a standard 9V DC center-negative power supply (not OutJ included) and consumes less than 100mA. P78869 stewmac.com ©2017 Stewart-MacDonald page 9 of 10...
  • Page 10 Solder these four leads as shown to finish the assembly. .1J63 Screw the bottom onto the case and put the knob on the volume control. VOLUME Plug in and rock out! OutJ Here’s how to use the BOMB BOOST: P78869 Requires 9V DC center-negative power supply (not included) Volume Adusts the signal’s...