Shattered Glass Audio Little Devil User manual

Little Devil
Little DevilLittle Devil
Little Devil

© 2011 by Shattered Glass Audio. 2
© 2011 by Shattered Glass Audio.
All rights reserved. No part of this document may be reproduced or transmitted in any
form or by any means, electronic, mechanical, photocopying, recording, or other ise,
ithout prior ritten permission of Shattered Glass Audio.

© 2011 by Shattered Glass Audio. 3
DESCRIPTION ........................................................................................................................................... 4
PARTS CHECKLIST..................................................................................................................................... 4
RESISTORS..................................................................................................................................................... 4
CAPACITORS .................................................................................................................................................. 5
ICS.............................................................................................................................................................. 5
POTENTIOMETERS........................................................................................................................................... 5
JACKS ........................................................................................................................................................... 5
LED ............................................................................................................................................................. 5
SWITCHES ..................................................................................................................................................... 6
OTHER HARDWARE ......................................................................................................................................... 6
ASSEMBLY................................................................................................................................................ 6
SOLDERING.................................................................................................................................................... 6
DRILLING THE ENCLOSURE ................................................................................................................................ 9
PUTTING IT TOGETHER ................................................................................................................................... 10
Assembling the Enclosure Mounted DC jack (version 2 of the kit only) ..............................................
Finishing up ......................................................................................................................................... 2
OPERATION............................................................................................................................................ 13
SELECTION SWITCH ....................................................................................................................................... 13
GAIN......................................................................................................................................................... 13
TONE ........................................................................................................................................................ 14
VOLUME................................................................................................................................................... 14
PEDAL OUTPUT VOL. ................................................................................................................................ 14
PRECAUTIONS ........................................................................................................................................ 15
LOCATION ................................................................................................................................................... 15
POWER SUPPLY ............................................................................................................................................ 15
INTERFERENCE WITH OTHER ELECTRONIC DEVICES................................................................................................ 15
HANDLING................................................................................................................................................... 15
KEEPING FOREIGN MATTER OUT OF YOUR EQUIPMENT.......................................................................................... 15

© 2011 by Shattered Glass Audio. 4
Description
The Little Devil has no equal among portable, DC po ered, small amps. It features full
pre and po er amp sections. A ide range tone control lets you dial in the tone you
ant. With its chimey cleans, t o distinct flavors (smooth and gritty) of fat, gro ly,
overdrive, and a raunchy distortion hen cranked up, the Little Devil is suitable for a
ide range of genres. By simply turning the s itch, the Little Devil becomes an effects
pedal letting you take the sound you love to higher po er levels. Connect the Little
Devil to your favorite speakers or amp and experience the sonic richness that Little Devil
has to offer.
Connectors:
INPUT Jack, OUTPUT Jack, AC Adaptor Jack (DC 9V)
Po er Supply:
DC 9V: Dry Battery 9V type or a 9V, regulated, AC Adaptor
Controls:
GAIN, TONE, VOLUME, PEDAL OUTPUT VOL., OFF-AMP-PEDAL s itch
Amp output:
~0.75W into 8Ω load. Amp can drive speakers from 4Ω -16Ω.
Parts Checklist
Resistors
value Color code
R1 51 Green/Bro n/Black
R2 100k Bro n/Black/Yello
R3 51k Green/Bro n/Orange
R4 1M Bro n/Black/Green
R5 10M Bro n/Black/Blue
R6 2.7k Red/Purple/Red
R7 51k Green/Bro n/Orange
R8 2.2M Red/Red/Green
R9 10M Bro n/Black/Blue
R10 2.2k Red/Red/Red
R11 680 Blue/Gray/Bro n
R12 2.7k Red/Purple/Red
R13 10k Bro n/Black/Orange
R14 5.1k Green/Bro n/Red
R15 10 Bro n/Black/Black
R16 100 Bro n/Black/Bro n
R20 6.8k Blue/Gray/Red

© 2011 by Shattered Glass Audio. 5
Capacitors
Part Value (F)
C1 1000u
C2 470u
C3 47u
C4 22n 223
C5 22n 223
C6 10p 100
C7 22n 223
C8 10n 103
C9 22n 223
C10 47n 473
C11 22n 223
C12 4.7n 472
C13 3.3u
C14 47u
C15 47n 473
C16 220u
ICs
Part Value
IC1 CD4007
IC2 LM386
Note that CD4007 is a CMOS IC and can b d stroy d by l ctrostatic discharg .
Potentiometers
Part Value
MASTER A100k
PREAMPVOL A100k
SBOUTVOL A100k
TONE B100k
Jacks
Part Value
POWER 2.1mm DC Jack
INPUT ¼” Stereo Jack
OUT ¼” Mono Jack
LED
3mm blue LED

© 2011 by Shattered Glass Audio. 6
Switches
Part Value
S1 Rotary S itch
SW1 3PDT Foot S itch
Other Hardware
4 knobs ith a red cap
1 knob ith a silver top
Leaf Spring
9V Battery Snap
PCB
Assembly
Soldering
Little Devil is designed such that all components are soldered to the PCB.
The Follo ing are general soldering recommendations:
-Use a soldering iron ith temperature control.
-Do not spend more than 3 seconds hile soldering each leg of a transistor, a
resistor, a capacitor, an IC, or a diode.
-Use an ESD safe soldering iron ith temperature control hen soldering CMOS
ICs and MOSFETs.
-Use a heat sink hen soldering active components.
-Inspect all solder joints for completeness and cold solder.
-Ensure that components under potentiometers are fully inserted into the PCB.
-Ensure that 3PDT s itch, rotary s itch, DC jack, input jack, and output jack are
fully inserted into the PCB and that they vertical (i.e. at the right angle ith the
PCB).
The follo ing are general instructions on the order of soldering components to the PCB.
NB your kit may not contain all components listed belo . This does not mean that your
kit is incomplete.
Solder components in the follo ing order:
1. Sock ts (if you are using them) for ICs. Sockets are not supplied ith the kit. You
can purchase sockets from many online stores and they are also available at
Radio Shack.
2. Diod s – Make sure you orientate diodes such that the diode orientation
matches orientation on the PCB.
3. R sistors
4. ICs – If you are not using IC sockets, solder ICs to the PCB. Make sure that the IC
is orientated such that notch on the IC matches the notch on the PCB layout.

© 2011 by Shattered Glass Audio. 7
CMOS ICs, such as CD4007, can easily be damaged with electrostatic discharge.
To solder CMOS ICs use only an SD safe soldering iron. The regular soldering
iron is not ESD safe and can easily destroy a CMOS IC.
5. Transistors – Make sure to orientate transistors such that the flat part of the
transistor body lines up ith the flat side on the PCB. Transistors can be
damaged by prolonged exposure to heat. In addition to keeping your soldering
iron not overly hot and not spending more than 3 seconds on soldering each leg
of a transistor, e recommend that you use a heat sink clipped to a leg of the
transistor you are soldering. MOSF Ts can easily be damaged with electrostatic
discharge. To solder MOSF Ts use only an SD safe soldering iron. The regular
soldering iron is not ESD safe and can easily destroy a MOSFET.
6. C ramic Capacitors
7. Film Capacitors
8. L af Spring
9. PCB mount d DC jack
10. Input and Output Jacks
11. El ctrolytic Capacitors – Electrolytic capacitors are polarized and need to be
properly orientated on the PCB. Make sure that the positive lead of the capacitor
is inserted into the hole ith a small plus sign next to it.
12. Batt ry Snap – The red lead of the battery snap goes into the hole marked “+”,
hereas the black lead of the battery snap goes into the hole marked “-“ on the
PCB
13. Pot ntiom t rs – Before mounting potentiometers make sure you snap off the
tab on the side of each potentiometer. To be able to mount potentiometers onto
the PCB you may need to straighten and adjust legs of a potentiometer. Mount
each potentiometer such that it matches the outline on the PCB.
14. Rotary Switch – To be able to insert the rotary s itch into the PCB you might
need to straighten and adjust the pins on the bottom of the rotary s itch.
15. 3PDT Foot Switch – The 3PDT Foot S itch should be inserted into the PCB such
that the longer side of solder lugs is parallel to the longer side of the board (i.e.
length of the board)
16. LED – When inserting the LED into the PCB make sure that the flat side of the
LED matches the flat side on the figure belo . Lift the LED up from the PCB until
the top of the collar on the LED lines up or is slightly belo the top of the body of
the potentiometers. Top of the collar of the LED should be at most ¾”-13/16”
above the PCB.

© 2011 by Shattered Glass Audio. 8
LEAF
SPRING

© 2011 by Shattered Glass Audio. 9
Drilling the Enclosure
Little Devil PCB is designed ith the Hammond 1590BB type enclosure in mind. It is possible to
fit the Little Devil in a larger enclosure ith some modifications, though. Drill template belo is
for the Hammond 1590BB enclosure. When printing the drill template, for your version of the
kit, make sure to set printing options to no scaling, other ise template may not match the
enclosure.
Figure belo is the drilling t mplat for v rsion 1 of the kit.
Drilling Template for version 1 of the kit.

© 2011 by Shattered Glass Audio. 10
Figure belo is the drilling t mplat for v rsion 2 of the kit.
½” diameter
(DC Jack)
½” diameter
(¼” Jack)
½” diameter
(3PDT Switch)
1/8" diameter
(LED)
5/1 " diameter
(Potentiometers)
½” diameter
(¼” Jack)
3/8" diameter
(Rotary switch)
Drilling Template for version 2 of the kit.
After you have printed the template attach it to the enclosure. When attaching the template to
the enclosure make sure that the top edge of the template is aligned ith the top edge of the
enclosure. Mark the holes ith a center punch. Remove the template. Drill the holes.
Putting it together
After all components are soldered, the enclosure is drilled, and the faceplate/art ork is
attached you are ready to assemble the Little Devil.
Before inserting the PCB ith components soldered to it, unscre all nuts and remove all
ashers from potentiometers, ¼” jacks, and the rotary s itch. Unscre the top nut and remove
the locking asher and the hite asher from the 3PDT s itch. Unscre the bottom nut on

© 2011 by Shattered Glass Audio. 11
the 3PDT s itch until it is about ½”- ¾” above the PCB. Insert the PCB into enclosure making
sure that potentiometers shafts, LED, and 3PDT s itch shaft go into appropriate holes. First,
scre in nuts and ashers of the ¼” jacks starting ith the jack on the side of the spring leaf.
Tighten the nuts of the ¼” jacks ith your fingers until you cannot turn the nuts any more. Do
not use tools to tighten the nuts on ¼” jacks. Over tightening the nuts on the ¼” jacks ill cause
the PCB to bend. Next, scre on ashers and nuts for the potentiometers, making sure that
nuts are scre ed on tightly. With your finger unscre the nut that is on the shaft of the 3PDT
s itch, inside the enclosure, until it touches the roof of the enclosure. No , scre on nut and
ashers for the 3PDT s itch.
Assembling the Enclosure Mounted DC jack (version 2 of the kit only
The follo ing section applies only to version 2 of the kit, only. Strip and tin both ends of each
ire. Solder one end of each ire to the DC jack according to the figure belo .
Center Pin
(Black wire)
Sleeve
(Red wire)
Sleeve (switched)
(Red wire)

© 2011 by Shattered Glass Audio. 12
Insert and securely fasten DC po er jack. Solder the ires from the jack to the bottom side of
the PCB (i.e. the side opposite the side here other components are soldered) according to the
figure belo .
You ill be soldering the ires to the pads here the PCB mounted DC jack ould have been
soldered. It is neither necessary nor advisable to fill the hole hole ith the solder. Lay the ire
as flat as possible on the PCB such that the tinned tip lies across the pad it ill be soldered to.
Make sure that the bare ire, or the tinned tip, is not touching any other pads or exposed
traces. You may find it useful to tape, insulated, parts of the ire to the PCB using a piece of
the electrical tape, or some other kind of tape, to keep the ire from moving hile soldering.
Finishing up
What follo s applies to both versions of the kit. Close the enclosure. Put bumpers on the
bottom of the enclosure. Install knobs ith the red top on potentiometers. Install the knob ith
the silver top on the rotary s itch, and you are done.

© 2011 by Shattered Glass Audio. 13
Operation
Little Devil is designed to operate on 9V by using either a 9V battery or a regulated, center-
negative, 9V po er supply, such as BOSS PSA-120.
Little Devil can be operated either as an amplifier or as an effects pedal. The knob ith the
silver top in the picture belo is used to select the mode of operation and to turn the Little
Devil off. In addition to the mode selection s itch there are four other controls GAIN, TONE,
VOLUME, and PEDAL OUTPUT VOL.
Selection Switch
To operate the Little Devil as an amp set the selection s itch to point to “AMP” and connect
your speakers to the “OUT” jack.
To operate the Little Devil as an effects pedal set the selection s itch to point to “PEDAL” and
connect your amp to the “OUT” jack.
To turn the Little Devil off set the selection s itch to point to “OFF”. When running on battery,
the Little Devil can also be turned off by unplugging the guitar cord.
G IN
GAIN acts as a preamp volume. It controls the gain of the preamp section of the Little Devil.

© 2011 by Shattered Glass Audio. 14
TONE
TONE controls frequency shaping.
VOLUME
VOLUME acts as a master volume. It controls the overall volume of Little Devil’s po er section.
PED L OUTPUT VOL.
PEDAL OUTPUT VOL. is active only in the PEDAL mode. It controls the output level of the Little
Devil.

© 2011 by Shattered Glass Audio. 15
Precautions
Location
Using the unit in the follo ing locations can result in a malfunction:
-In direct sunlight
-In rain
-Location of extreme temperature or humidity
-Excessively dusty or dirty locations
-Locations of excessive vibrations
-Close to magnetic fields
Power supply
Be sure to unplug the po er supply hen the unit is not in use. Remove battery in order to
prevent it from leaking hen the unit is not in use for extended periods.
Interference with other electronic devices
Radios and television sets placed nearby this unit may experience reception interference.
Handling
To avoid breakage, do not apply excessive force to the s itches, potentiometers, or controls.
Keeping foreign matter out of your equipment
Never set any container ith liquid in it near this equipment. If liquid gets into the equipment,
it could cause a breakdo n, fire, or electric shock. Be careful not to let metal objects into the
equipment.