Weston Precision Audio AD110 User manual
© 2020 Weston Precision Audio
1
AD110
Analog Drums
DIY Eurorack Module
Weston Precision Audio
Designed In Portland, Oregon
Revision 11 - June 25, 2022
DESCRIPTION
AD110 is a 6-voice analog drum module
inspired by the vintage Japanese
machines with the same number. The
module produces 6 voices; kick drum,
snare drum, hand clap, closed hi-hat,
open hi-hat, and ride cymbal, all of
which are contained in a very compact
16HP Eurorack module! Each voice is
outputted to it’s own ~10Vpp Eurorack-
standard output, as well as being sent to
a mix output which can accept an
additional trigger to produces sounds on
this output to be briefly louder in time
with that trigger (AKA “Accent”).
In addition to each voice being
essentially faithfully recreated from their
original circuitry, some modifications
have been made to increase the range
of sounds available, including tone
control for the decaying portion of the
kick drum (pitch and resonance), pitch
for the resonant portion of the snare
drum, decay of the “snare wires” (noise)
part of the snare drum, decay of the
cymbal sound, the spread or flam
amount of the hand clap sound, and the
length of the clap “reverb”.
SPECS
Module Size: 16HP
VCO Output (All outputs ~1kOhm
Impedance): Individual drum outs and
mix output.
Inputs (All inputs >=100kOhm
Impedance): Trigger In (kick/snare/OH/
CH/Cymbal/Clap), Accent In.
All individual wave outputs: 10 Volts
peak-to-peak nominally.
Mix output: Nominally 6Vpp, expanding
to 10Vpp max for “Accent” events.
Power input: +12V & -12V via standard
10 pin Eurorack connector.
Power consumption (+12V / -12V):
Typ: 75mA / 35mA
Max: 85mA / 45mA
MAXIMUM LIMITS
Supply Voltage: +13.5V / -13.5V
Trigger & Accent Input: Supply limits.
© 2020 Weston Precision Audio
2
THEORY OF OPERATION
The resonant “drum” portion of both the
snare drum and kick drum are the same
type of circuit, which is known as a
“damped oscillator” circuit. This circuit
oscillates at a frequency which is
determined by the resistors and
capacitors in the T-Networks when it is
hit with an impulse (i.e the negative
going pulse on the Qbar outputs of
Monostable U202, and decays naturally
until it is hit again with an impulse. The
snare drum has an additional VCA
profile which occurs in unison with the
drum sound portion and gates a filtered
noise source to produce the sound of the
snare wires.
Speaking of VCAs, all of the drum
circuits which have a VCA use an
extremely simply design which works
basically in reverse from a standard
VCA. The “signal” is essentially an
Attack-Decay envelope formed by an RC
network and this envelope is gated
through a diode and transistor by a
control signal, be it noise, or the cymbal
frequencies. Not a hi-fi VCA by any
means, but it is SIMPLE and it is
effective!
The cymbal sounds (Open and closed hi
hat and cymbal) all are formed by
gating a mix of fundamental frequencies
through the VCAs mentioned above. The
4 cymbal frequencies are commonly
found in various analog drum machines
of the time. They are formed via simple
CMOS inverter oscillators in U101 and
U105 and are approximately 305Hz,
44Hz, 794Hz, and 1136Hz. These 4
signals are mixed together and filtered
with another T network in U104A and
U104B to form the final cymbal tones
CYMOSC1 and CYMOSC2.
The noise source, which is utilized to
form the basis of the clap sound as well
as the “snare wires” part of the snare
sound is a CMOS shift-register-based
design. This type of noise generator
produces a high frequency oscillation of
about 78kHz (using the gates U102C
and U102D and R105/R106/C104).
This signal is applied to the clock pin of
the shift register, and due to the
connections on the shift in/shift out pins
of the shift register, a pseudo-random
“noise” is produced as the output. The
noise is actually a very very long
repeating pattern (a Fibonacci
sequence!), but it is not noticeable and
therefore is quite usable as “white
noise”.
Finally, the main VCA has been
reworked from the original 100%
transistor-based design. It was found that
the original design was quite noisy so a
OTA-based design is used instead. This
VCA (U204A and U203B) operates at a
fixed gain in normal conditions, and
then increases briefly if an Accent
trigger is issued. The Accent envelope is
formed by the original Accent envelope
circuitry, which is on PCB-C.
© 2020 Weston Precision Audio
3
NOTES ON BUILDING
Before beginning, please make sure you
have the tools you will need to make the
build successful, and most importantly,
fun!
Required:
- Soldering iron with reasonably small
tip.
- Flux-core solder
- “No-clean” solder (for soldering pots
after cleaning).
- Phillips head screw driver
- Small wire/clipping pliers
Recommended:
- Digital volt meter
- Oscilloscope
- Spanner tool for knurled jack nuts (if
you want to avoid slipping with pliers
and scratching your lovely new panel!)
- Beer. Recommend pairing: Buoy Pilsner
(Astoria, Oregon)
Now, let’s get to it!
© 2020 Weston Precision Audio
4
© 2020 Weston Precision Audio
5
BUILD INSTRUCTIONS
Start by building PCB-A. Start with
diodes, resistors, ferrite beads, then
caps, then DIP sockets, connectors, and
finally THT transistors.
© 2020 Weston Precision Audio
6
AD110 PCB-A Rev BB Build Table
Reference
Quantity
Value
Footprint / Note
C101 C107
2
4.7n Film 5%
Film “box” type. 5% Tolerance or hand select.
C102 C103
2
3.3n Film
Film “box” type
C104 C130 C122 C123
4
470p
Multilayer ceramic radial
C108 C127 C134 C106 C111
5
1n Film
Film “box” type
C110
1
4.7u
Raidal electrolytic
C113 C138
2
100u
Raidal electrolytic
C114 C119
2
10n Film 5%
Film “box” type. 5% Tolerance or hand select.
C115 C116
2
6.8n Film
Film “box” type
C117 C126
2
47n Film
Film “box” type
C118
1
33p
Multilayer ceramic radial
C120 C128 C132 C109
4
2.2n Film
Film “box” type
C125 C131 C105
3
10n
Multilayer ceramic radial
C129 C121 C124
3
1u
Raidal electrolytic
C133
1
470p
Multilayer ceramic radial
C135 C112
2
0.47u
Multilayer ceramic radial
C136 C137 C143
3
33u
Raidal electrolytic
C139 C140 C141 C142 C144 C145
6
100n
Multilayer ceramic radial
D102 D103 D106 D107 D101 D104 D105
7
1SS133M
General purpose diode
D108 D109
2
1N4001
Rectifier diode
D110
1
TZX9V1D
Zener diode
J101
1
Eurorack Power
Boxed/Keyed 10-pin connector. Install on back side of board.
JP111
1
A/B Interconnect 1
2.54mm Pin Socket, 6 position. Install front side of board.
JP112
1
A/B Interconnect 2
2.54mm Pin Socket, 6 position. Install front side of board.
JP115
1
A/B Interconnect 3
2.54mm Pin Socket, 12 position. Install front side of board.
L101 L102
2
Ferrite
Ferrite bead axial
Q107 Q110 Q102
3
BC559B
Transistor, BJT, TO-92 Inline package
Q109 Q108 Q106 Q111 Q101 Q103 Q104 Q105
8
BC549B
Transistor, BJT, TO-92 Inline package
R101 R127 R158
3
82k
1% Metal film resistor axial
R102 R113 R126 R136
4
100k 0.1%
0.1% Metal film resistor axial
R103
1
442k
1% Metal film resistor axial
R106 R155 R171 R123 R119
5
10k
1% Metal film resistor axial
R107
1
86.6k 0.1%
0.1% Metal film resistor axial
R110 R133
2
560R
1% Metal film resistor axial
R114 R128 R156 R168
4
22k
1% Metal film resistor axial
R116
1
2.2M
1% Metal film resistor axial
R117
1
127k 0.1%
0.1% Metal film resistor axial
R122
1
20k
1% Metal film resistor axial
R124 R161
2
220k
1% Metal film resistor axial
R125 R105 R108 R121 R132 R138 R151 R163 R147 R150 R165 R169
R109 R112 R115 R129
16
100k
1% Metal film resistor axial
R130
1
107k 0.1%
0.1% Metal film resistor axial
R131 R148
2
2M
1% Metal film resistor axial
R134
1
47k
1% Metal film resistor axial
R135
1
39k
1% Metal film resistor axial
R139 R149 R162 R159 R167 R111 R142 R143
8
33k
1% Metal film resistor axial
R140
1
158k 0.1%
0.1% Metal film resistor axial
R141
1
374R
1% Metal film resistor axial
R144
1
68k
1% Metal film resistor axial
R145
1
27k
1% Metal film resistor axial
R146 R160 R104
3
200k
1% Metal film resistor axial
R152 R164 R137
3
1k
1% Metal film resistor axial
R153 R170 R120
3
5.6k
1% Metal film resistor axial
R154 R166 R118
3
220R
1% Metal film resistor axial
R157
1
470k
1% Metal film resistor axial
R172
1
330R
1% Metal film resistor axial
U102
1
CD4070
DIP 14 Socket
U104
1
TL072
DIP 8 Socket
U105 U101
2
CD4069
DIP 14 Socket
U106
1
CD4006
DIP 14 Socket
U107
1
TL074
DIP 14 Socket
U108 U103
2
CD4098
DIP 16 Socket
1
BUILD INSTRUCTIONS, cont.
Next, stuff PCB-B using the same parts
order as the previous board.
© 2020 Weston Precision Audio
7
AD110 PCB-B Rev BB Build Table
Reference
Quantity
Value
Footprint
C201 C224
2
2.2n Film
Film “box” type
C202 C205
2
1.2n Film
Film “box” type
C204
1
0.47u
Multilayer ceramic radial
C206 C207
2
22n Film
Film “box” type
C210
1
68n Film
Film “box” type
C211 C221
2
1u
Radial electrolytic. C221 See next page detail.
C215
1
2.2u
Radial electrolytic
C216
1
22n
Multilayer ceramic radial
C217 C203
2
10n
Multilayer ceramic radial
C218 C208
2
33p
Multilayer ceramic radial
C220 C214 C213 C209 C212
5
33n Film
Film “box” type
C223
1
470p
Multilayer ceramic radial
C225
1
1n Film
Film “box” type
C226
1
10p
Multilayer ceramic radial
C228
1
47n Film
Film “box” type
C229 C232
2
47p
Multilayer ceramic radial
C231 C227 C230 C222
4
6.8n Film
Film “box” type
C233 C234 C235 C236 C237 C238 C239 C240 C241
C242 C219
11
100n
Multilayer ceramic radial
D201 D202 D203 D204*
4
1SS133M
D204 is labeled as D205 on silkscreen. D204=D205
JP201
1
B/C Interconnect 1
2.54mm Pin Socket, 6 Position. Install on front side of board.
JP202
1
B/C Interconnect 3
2.54mm Pin Socket, 6 Position. Install on front side of board.
JP203
1
B/C Interconnect 2
2.54mm Pin Socket, 6 Position. Install on front side of board.
JP204
1
B/C Interconnect 4
2.54mm Pin Socket, 6 Position. Install on front side of board.
JP205
1
B/C Interconnect 5
2.54mm Pin Socket, 12 Position. Install on front side of board.
JP211
1
B/A Interconnect 1
2.54mm Pin Header, 6 Position. Install on back side of board.
JP212
1
B/A Interconnect 2
2.54mm Pin Header, 6 Position. Install on back side of board.
JP215
1
B/A Interconnect 3
2.54mm Pin Header, 12 Position. Install on back side of board.
Q201 Q203 Q206
3
BC559B
Transistor, BJT, TO-92 Inline package
Q202 Q204 Q207 Q208
4
BC549B
Transistor, BJT, TO-92 Inline package
Q205
1
J112
Transistor, JFET, TO-92 Inline package. JFET! Careful with ESD!
Q209
1
KSC945
Transistor, BJT, TO-92 Inline package
R201 R216 R209 R222 R210 R211 R233 R243 R257
9
33k
1% Metal film resistor axial
R202 R240 R249
3
10k
1% Metal film resistor axial
R204 R242 R237 R223 R256 R247 R255 R266
8
1k
1% Metal film resistor axial
R205 R234 R235 R238
4
100k
1% Metal film resistor axial
R206
1
47k
1% Metal film resistor axial
R207 R251 R224
3
2.2M
1% Metal film resistor axial
R208 R221 R236
3
220R
1% Metal film resistor axial
R213
1
15k
1% Metal film resistor axial
R218 R217 R212 R215 R226 R225
6
68k
1% Metal film resistor axial
R219
1
12k
1% Metal film resistor axial
R220 R248
2
30k
1% Metal film resistor axial
R227
1
620k
1% Metal film resistor axial
R228 R203
2
200k
1% Metal film resistor axial
R230 R229 R245
3
1M
1% Metal film resistor axial
R231 R252
2
18k
1% Metal film resistor axial
R232
1
330R
1% Metal film resistor axial
R239
1
22k
1% Metal film resistor axial
R241
1
270k
1% Metal film resistor axial
R244
1
120k
1% Metal film resistor axial
R246 R254
2
51k
1% Metal film resistor axial
R250 R259 R264
3
27k
1% Metal film resistor axial
R253 R258 R261 R263 R265 R214
6
39k
1% Metal film resistor axial
R260
1
180R
1% Metal film resistor axial
R262
1
43k
1% Metal film resistor axial
TP201
1
100k VCA CVR
Trimmer potentiometer, Bourns 3266Z Horizontal style
U201
1
TL074
DIP 14 Socket
U202
1
CD4098
DIP 16 Socket
U203 U205
2
NE5532
DIP 8 Socket
U204
1
LM13700
DIP 16 Socket
1
BUILD INSTRUCTIONS, cont.
For revision BB of PCB-B (first release),
the footprint for C221 looks like a disc
type, but you should install the 1uF
electrolytic here as shown, with the
negative (stripe) leg installed to the
ground hole (closest to Q206 next to it).
© 2020 Weston Precision Audio
8
BUILD INSTRUCTIONS, cont.
Finally, stuff PCB-C with the same parts
order as the previous board. Leave
the pots and LEDs off for now.
© 2020 Weston Precision Audio
9
AD110 PCB-C Rev BB Build Table
Reference
Quantity
Value
Footprint
C302
1
33u
Radial electrolytic
C303 C304
2
0.47u
Multilayer ceramic radial
C305 C309 C310 C311 C301
5
10n
Multilayer ceramic radial
C306 C307 C308 C312 C313 C314
6
100n
Multilayer ceramic radial
D301
1
Accent LED
3mm Flat Top diffused yellow LED. Do not install yet.
D302
1
Kick LED
3mm Flat Top diffused yellow LED. Do not install yet.
D303
1
CH LED
3mm Flat Top diffused yellow LED. Do not install yet.
D304
1
Snare LED
3mm Flat Top diffused yellow LED. Do not install yet.
D305
1
OH LED
3mm Flat Top diffused yellow LED. Do not install yet.
D306
1
CY LED
3mm Flat Top diffused yellow LED. Do not install yet.
D307
1
Clap LED
3mm Flat Top diffused yellow LED. Do not install yet.
D309 D310 D312 D313 D308
5
1N4148
General purpose diode
J301-J314
1
I/O Jacks
Thonkiconn PJ398SM Mono Jack
JP301
1
C/B Interconnect 1
2.54mm Pin Header, 6 Position. Install on back side of board.
JP302
1
C/B Interconnect 3
2.54mm Pin Header, 6 Position. Install on back side of board.
JP303
1
C/B Interconnect 2
2.54mm Pin Header, 6 Position. Install on back side of board.
JP304
1
C/B Interconnect 4
2.54mm Pin Header, 6 Position. Install on back side of board.
JP305
1
C/B Interconnect 5
2.54mm Pin Header, 12 Position. Install on back side of board.
Q301 Q302 Q305 Q306 Q303 Q307 Q304
7
BC547C
Transistor, BJT, TO-92 Inline package
Q308
1
BC559B
Transistor, BJT, TO-92 Inline package
R304 R306 R302 R314 R316 R333 R336
7
20k
1% Metal film resistor axial
R312
1
22k
1% Metal film resistor axial
R313
1
30k
1% Metal film resistor axial
R319
1
120R
1% Metal film resistor axial
R320
1
33k
1% Metal film resistor axial
R323
1
560R
1% Metal film resistor axial
R328 R341 R342
3
200k
1% Metal film resistor axial
R329
1
240k
1% Metal film resistor axial
R330 R331 R334 R308
4
120k
1% Metal film resistor axial
R332 R305 R315 R307 R317 R303 R337
7
4.7K
1% Metal film resistor axial
R335 R309 R321 R310 R322 R311 R339 R324 R325 R340
10
100k
1% Metal film resistor axial
R338 R326 R327 R301 R318
5
10k
1% Metal film resistor axial
RV301
1
B1M Cym Decay
Alpha 9mm Single Gang Pot. Do not install yet.
RV302
1
100k Kick Decay
Alpha 9mm Single Gang Pot. Do not install yet.
RV303
1
100k Snare Decay
Alpha 9mm Single Gang Pot. Do not install yet.
RV304
1
100k Kick Pitch
Alpha 9mm Single Gang Pot. Do not install yet.
RV305
1
100k Clap Reverb
Alpha 9mm Single Gang Pot. Do not install yet.
RV306
1
10k Mix Bal
Alpha 9mm Single Gang Pot. Do not install yet.
RV307
1
100k Snare Pitch
Alpha 9mm Single Gang Pot. Do not install yet.
RV308
1
100k Acc Amount
Alpha 9mm Single Gang Pot. Do not install yet.
RV309
1
A1M Clap Flam
Alpha 9mm Single Gang Pot. Do not install yet.
U301
1
CD40106
DIP 14 Socket
U302 U303
2
CD4098
DIP 16 Socket
1
BUILD INSTRUCTIONS, CTD.
Now that you’ve stuffed all 3 PCBs
except for the pots and installing ICs,
put all 3 boards through your flux
cleaning procedure. Most people
prefer to use water soluble flux for this.
After cleaning the boards and
thoroughly blowing them off with
compressed air, check if your pots
have an alignment tab on them. If they
do, clip them all off. Solder the pots with
“no-clean” solder.
To Install the LEDs, first place a piece of
masking tap on the front panel:
Then, place the LEDs into their holes and
mount PCB-C to the panel with just 1 pot
washer and nut. With the panel facing
down, wiggle the LEDs into their holes
on the panel until you can feel them
touch the tape with your fingers (ie they
are flush with the font of the panel:
Then, solder the legs of the LEDs and
clip them Flush. Remove the tape and
you should have beautiful flush LEDs!
Remove the panel for now and set it
aside.
Next, install all the ICs into their sockets
in the correct locations listed on the
build tables for each respective board.
Use good ESD protocol when handling
ICs, especially the LM13700s!!
You should now be ready to power the
unit up!
© 2020 Weston Precision Audio
10
CALIBRATION
Upon powering the unit up, and all has
gone well, you should be able to apply
a gate to each of the 6 inputs and get a
sound on the corresponding output, as
well as a blink of the corresponding
LED. Their is only 1 calibration item for
this board:
VCA CVR Trim
1) Plug the MIX audio out to a means
of listening over speakers.
2) Make sure none of the 6 gate inputs
are connected.
3) Turn the MIX knob to the center and
the ACCENT knob to full clockwise.
4) Connect a gate to the ACCENT input
and trigger this gate over and over
while you listen to the output from
step (1). Turn the trim pot TP201 (the
only trump pot!) until you minimize
any thump sound from the accent
bleeding through. You may have to
turn your speakers up a bit to notice
it.
Calibration is now complete!
At this point, the build is basically
finished. If you haven’t already, make
sure all the screws are tight and install
the front panel with all the pot nut/
washers and jack nut/washers. Install
the knobs as shown in the finished
picture on the next page.
Have fun with your new module and
thank you!!
The following pages are for reference
and include photos of the finished unit
and PCBs, as well as the electrical
schematics for diagnosis/
troubleshooting.
© 2020 Weston Precision Audio
11
REF (Finished Unit)
© 2020 Weston Precision Audio
12
REF (PCB Pics Finished)
© 2020 Weston Precision Audio
13
SCHEMATICS (PCB-A)
© 2020 Weston Precision Audio
14
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
A
B
C
D
E
A
B
C
D
E
Date: 2021-01-28
KiCad E.D.A. eeschema (5.1.5-0-10_14)
Rev: BBSize: B
Id: 1/1
Title: 10060 - AD110 Analog Drum Synthesizer, PCB-A
File: AD110 PCB-A.sch
Sheet: /
Weston Precison Audio
GNDA
R107
86.6k 0.1%
GNDD
1H103
Mounting Hole
1H104
Mounting Hole
1H105
Mounting Hole
1H102
Mounting Hole
R172
330R
1X101
Silkscreen Logo
D110
TZX9V1D
VDD 14
VSS
7
U105G
4069
+12V
1
10
11
12
2
3
4
5
6
7
8
9
JP115
A/B Interconnect 3
GNDA
GNDD
+12V
C110
4.7u
GNDA
GNDA
1
2
3
4
H101
Ground Tie Point
GNDD
GNDA
C137
33u
R168
22k
GNDA
+12V
C136
33u
GNDA
C143
33u
+12V
-12V
D109
4001
-12V
1 2
U105A
4069
3 4
U105B
4069
GNDA
D108
4001
5 6
U105C
4069
89
U105D
4069
L102
Ferrite
L101
Ferrite
1
10
2
34
56
78
9
J101
Eurorack Power
1011
U105E
4069
GNDD
1213
U105F
4069
C101
4.7n Film 5%
GNDA
R102
100k 0.1%
1
2
3
4
5
6
JP111
A/B Interconnect 1
1
2
3
4
5
6
JP112
A/B Interconnect 2
DA
1
Q3B 10
Q3B 11
Q4C 12
Q3A 13
CP
3
DC
4
DB
5
DD
6Q3D 8
Q4D 9
U106
4006
+12V
GNDA
+12V
-12V
C145
100n
GNDA
C144
100n
C142
100n
C141
100n
C140
100n
C139
100n
R117
127k 0.1%
C107
4.7n Film 5%
R129
10k
R113
100k 0.1%
C126
47n Film
+12V
R148
2M
GNDA
1
2
3
Q105
BC549B
D105
1SS133M
R135
39k
GNDA
R145
27k
4
5
6
U102B
4070
10
8
9
U102C
4070
11
12
13
U102D
4070
VDD 14
VSS
7
U102E
4070
C123
470p
GNDA
R156
22k
R144
68k
C122
470p
R143
33k
GNDA
C124
1u
R142
33k
D104
1SS133M
1
2
3
U102A
4070 R134
47k
+12V
R116
2.2M
GNDA
C121
1u
1
2
3
Q104
BC549B
R122
20k
C109
2.2n Film
R130
107k 0.1%
C114
10n Film 5%
R137
1k
R124
220k
R128
22k
C118
33p
R125
100k
GNDA
R126
100k 0.1%
D102
1SS133M
C111
1n Film
C117
47n Film
GNDD
GNDD
GNDDGNDD
+12V
R131
2M
D103
1SS133M
GNDA
GNDD
1
2
3
Q103
BC549B
D101
1SS133M
R119
10k
GNDD
GNDA
R105
100k
C112
0.47u
R118
220R
+12V
1
2
3
Q102
BC559B
+12V
GNDD
R111
33k
R115
100k
C104
470p
V-
11 V+ 4
U107E
TL074
+
12
-
13
14
U107D
TL074
+
10
8
-
9
U107C
TL074
GNDD
R106
10k
+
5
-
6
7
U107B
TL074
1
-
2
+
3
U107A
TL074
C132
2.2n Film
R140
158k 0.1%
C119
10n Film 5%
+12V
R164
1k
R152
1k
C128
2.2n Film
-12V
5 6
U101C
4069
+12V
+12V
GNDD
C113
100u
R136
100k 0.1%
C133
470p
C138
100u
D107
1SS133M
R167
33k
VDD 14
VSS
7
U101G
4069
GNDA
GNDD
GNDD
1 2
U101A
4069
3 4
U101B
4069
89
U101D
4069
1011
U101E
4069
1
-
2
+
3
U104A
TL072
+
5
-
6
7
U104B
TL072
V-
4V+ 8
U104C
TL072
+12V
-12V
C102
3.3n Film
C103
3.3n Film
R110
560R
GNDA
R123
10k
R120
5.6k
+12V
1213
U101F
4069
C106
1n Film
GNDA
+12V
R112
100k
R109
100k
1
2
3
Q101
BC549B
R101
82k
GNDA
R171
10k
R170
5.6k
+12V
C134
1n Film
GNDA
+12V
GNDA
C115
6.8n Film
C116
6.8n Film
R133
560R
GNDA
R169
100k
R165
100k
1
2
3
Q111
BC549B
R155
10k
R153
5.6k
+12V
C127
1n Film
GNDA
+12V
R150
100k
R127
82k
R147
100k
1
2
3
Q106
BC549B
C130
470p
D106
1SS133M
R159
33k
+12V
1
2
3
Q108
BC549B
GNDA
R108
100k
R121
100k
R132
100k
R138
100k
GNDA
R141
374R
R161
220k
R158
82k
GNDD
R103
442k
1
2
3
Q109
BC549B
GNDA
R157
470k
GNDA
C135
0.47u
C108
1n Film
R114
22k
GNDA
C129
1u
R166
220R
R154
220R
+12V
C120
2.2n Film
R139
33k
+12V
1
2
3
Q110
BC559B
1
2
3
Q107
BC559B
+12V
R162
33k
+12V
R149
33k
R163
100k
R151
100k
GNDA
Q2 10
-TR2
11 +TR2
12
Reset2
13
Rx2_Cx2
14 Cx2
15
Q2 9
U108B
4098
VDD 16
VSS
8
U108C
4098
Cx1
1
Rx1_Cx1
2
Reset1
3
+TR1
4
-TR1
5
Q1 6
Q1 7
U103A
4098
Cx1
1
Rx1_Cx1
2
Reset1
3
+TR1
4
-TR1
5
Q1 6
Q1 7
U108A
4098
VDD 16
VSS
8
U103C
4098
C125
10n
+12V
+12V
R104
200k
C105
10n
GNDA
R146
200k
+12V
Q2 10
-TR2
11 +TR2
12
Reset2
13
Rx2_Cx2
14 Cx2
15
Q2 9
U103B
4098
+12V +12V
GNDA GNDA
+12V
+12V
+12V
GNDA
R160
200k
C131
10n
CHGATE
OHGATE
CYDEC
CYGATE
CH
OH
CY
NOISE
CYMOSC1
CYMOSC2
OHGATE
CHGATE
NOISE
CH
OH
CYMOSC1
CY
CYMOSC2
CYGATE
CYDEC
1136 Hz
794 Hz
444 Hz
305 Hz
SCHEMATICS (PCB-B)
© 2020 Weston Precision Audio
15
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
A
B
C
D
E
A
B
C
D
E
Date: 2021-05-02
KiCad E.D.A. eeschema (5.1.5-0-10_14)
Rev: BBSize: B
Id: 1/1
Title: 10059 - AD110 Analog Drum Synthesizer, PCB-B
File: AD110 PCB-B.sch
Sheet: /
Weston Precison Audio
R225
68k
R232
330R
R266
1k
GNDA
C219
100n
GNDA
GNDA
C242
100n
1 2
3
Q205
J112
+
5
-
6
7
U201B
TL074
V-
11 V+ 4
U201E
TL074
+
12
-
13
14
U201D
TL074
+
10
8
-
9
U201C
TL074
1
-
2
+
3
U201A
TL074
R245
1M
-12V
+12V
1H203
Mounting Hole
1H205
Mounting Hole
1H207
Mounting Hole
1H201
Mounting Hole
1
2
3
TP201
100k VCA CVR
R229
1M
C208
33p
R213
15k
R214
39k
R230
1M
GNDA
C207
22n Film
+12V
C211
1u
GNDD
-12V
GNDA
1
2
3
Q208
BC549B
GNDA
1
2
3
Q207
BC549B
-12V
+12V
GNDA
1
10
11
12
2
3
4
5
6
7
8
9
JP215
B/A Interconnect 3
1
2
3
4
5
6
JP212
B/A Interconnect 2
1X201
Silkscreen Logo
1H204
Mounting Hole
1H206
Mounting Hole
1H208
Mounting Hole
1H202
Mounting Hole
1
2
3
4
5
6
JP211
B/A Interconnect 1
1
10
11
12
2
3
4
5
6
7
8
9
JP205
B/C Interconnect 5
R205
100k
R201
33k
+12V
1
2
3
Q201
BC559B
1
2
3
4
5
6
JP204
B/C Interconnect 4
1
2
3
4
5
6
JP202
B/C Interconnect 3
1
2
3
4
5
6
JP203
B/C Interconnect 2
1
2
3
4
5
6
JP201
B/C Interconnect 1
+12V
-12V
+12V
R208
220R
C241
100n
C240
100n
C204
0.47u
C239
100n
C238
100n
GNDA
C237
100n
R218
68k
R216
33k
+12V
1
2
3
Q203
BC559B
C236
100n
C235
100n
C234
100n
C233
100n
+12V
+12V
+12V
R221
220R
+12V +12V
-12V -12V
GNDA
-12V
D202
1SS133M
-12V
+12V
GNDA
C215
2.2u
GNDA
GNDA
GNDA
R248
30k
R209
33k
R222
33k
R254
51k
GNDA
R246
51k
R210
33k
R255
1k
C226
10p
R217
68k
+12V R252
18k
C216
22n
GNDA
R211
33k
GNDA
GNDA
GNDA
R247
1k
C202
1.2n Film
C205
1.2n Film
R256
1k
V+ 11
V-
6
U204E
LM13700
V+
7
8
U204D
LM13700
1
DIODE_BIAS
2
+
3
-
4
5
U204C
LM13700
V+
10
9
U204B
LM13700
R207
2.2M
12
-
13
+
14
DIODE_BIAS
15
16
U204A
LM13700
R265
39k
1
2
3
Q202
BC549B
GNDA
R263
39k
R202
10k
R262
43k
R261
39k
+12V
R258
39k
R253
39k
C232
47p
GNDA
R264
27k
C229
47p
GNDA
C201
2.2n Film
R259
27k
R206
47k
+
5
-
6
7
U205B
NE5532
1
-
2
+
3
U205A
NE5532
GNDA
V-
4V+ 8
U203C
NE5532
R223
1k
C212
33n Film
C209
33n Film
GNDA
GNDA
C213
33n Film
GNDA
R204
1k
R226
68k
C214
33n Film
C206
22n Film
R220
30k
C210
68n Film
R234
100k
R233
33k
+12V
1
2
3
Q206
BC559B
R227
620k
+12V
R219
12k
R224
2.2M
+12V
R215
68k
+12V
R236
220R
C203
10n
R203
200k
C221
1u
GNDA
+12V
GNDA
+12V
C217
10n
R228
200k
+12V
C220
33n Film
GNDA
R235
100k
VDD 16
VSS
8
U202C
4098
Cx1
1
Rx1_Cx1
2
Reset1
3
+TR1
4
-TR1
5
Q1 6
Q1 7
U202A
4098
+12V
R238
100k
Q2 10
-TR2
11 +TR2
12
Reset2
13
Rx2_Cx2
14 Cx2
15
Q2 9
U202B
4098
GNDA
GNDA
R212
68k
+12V
1
2
3
Q204
BC549B
R240
10k
GNDA
D204
1SS133M
V-
4V+ 8
U205C
NE5532
+
5
-
6
7
U203B
NE5532
1
-
2
+
3
U203A
NE5532
R231
18k
GNDA
R242
1k
R237
1k
R241
270k
R243
33k
GNDA
C218
33p
D201
1SS133M
GNDA
C223
470p
D203
1SS133M
1
2
3
Q209
KSC945
R260
180R
GNDA
R251
2.2M
R239
22k
C222
6.8n Film
R250
27k
C228
47n Film
C224
2.2n Film
R249
10k
R244
120k
C225
1n Film
+12V
C231
6.8n Film
C227
6.8n Film
C230
6.8n Film
GNDA
R257
33k
CY
SDGATE
OH
CH
CHGATE
NOISE
OHGATE
ACCENV
NOISE
ACCBUF
CP1
CP2
SDDECCW
SDDECCCW
CYDEC
SD
BDGATE
ACCENT
CP2
CP1
CPREVCW
CPREVCCW
SDDECCWSDDECCCW
BDPITCH
BDDEC
SDGATE
BDDEC
CP
CPSDBD
OHCHCY
MIXRAW
BD
ACCENT
BD
ACCBUF
CPREVCCW CPREVCW
CYGATE
MIXRAW MIX
ACCENV
MIX
SDPITCH
SDPITCH
OH
BDPITCH
BDGATE
CH
OH
CY
SD
SD
CP
CP
CH
BD
CPSDBD
OHCHCY
CY
SCHEMATICS (PCB-C)
© 2020 Weston Precision Audio
16
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
A
B
C
D
E
A
B
C
D
E
Date: 2021-01-24
KiCad E.D.A. eeschema (5.1.5-0-10_14)
Rev: BBSize: B
Id: 1/1
Title: 10058 - AD110 Analog Drum Synthesizer, PCB-C
File: AD110 PCB-C.sch
Sheet: /
Weston Precison Audio
R335
100k
R336
20k
+12V
D307
Clap LED
R332
4.7k
+12V
Cx1
1
Rx1_Cx1
2
Reset1
3
+TR1
4
-TR1
5
Q1 6
Q1 7
U302A
4098
Q2 10
-TR2
11 +TR2
12
Reset2
13
Rx2_Cx2
14 Cx2
15
Q2 9
U302B
4098
+12V
GNDA
GNDA
C305
10n
GNDA
R342
200k
R341
200k
GNDA
-12V
GNDA
R328
200k
R340
100k
GNDA
+12V
+12V
R325
100k
C304
0.47u
GNDA
GNDA
R324
100k
GNDA
C303
0.47u
R323
560R
C306
100n
GNDA
C302
33u
R319
120R
+12V
R320
33k
1
2
3
Q308
BC559B
+12V
GNDA
1
1
22
33
RV308A
100k Acc Amount
GND 4
RV307B
100k Snare Pitch
GND 4
RV304B
100k Kick Pitch
+12V
+12V
R333
20k
+12V
R316
20k
1 2
U301A
40106
3 4
U301B
40106
5 6
U301C
40106
89
U301D
40106
VDD 14
VSS
7
U301G
40106
+12V
+12V
GNDA
C309
10n
R314
20k
+12V
R330
120k
R302
20k
+12V
+12V
R306
20k
+12V
C307
100n
R304
20k
GNDA
GNDA
+12V
GNDA GNDA
GNDA
+12V
GNDA
1
2
3
Q304
BC547C
1
2
3
Q307
BC547C
1
2
3
Q303
BC547C
1
2
3
Q306
BC547C
C310
10n
1
2
3
Q305
BC547C
R331
120k
1
2
3
Q302
BC547C
1011
U301E
40106
+12V
1213
U301F
40106
C301
10n
C308
100n
R308
120k
+12V
1
2
3
Q301
BC547C
GNDA
R318
10k
R329
240k
1
1
22
33
RV307A
100k Snare Pitch
GNDA
+12V
+12V
R312
22k
1
1
22
33
RV304A
100k Kick Pitch
GNDA
+12V
GNDD
1X301
Silkscreen Logo
GNDA
-12V
+12V
C311
10n
R334
120k
GND 4
RV309B
A1M Clap Flam
GND 4
RV308B
100k Acc Amount
GND 4
RV301B
B1M Cym Decay
GNDA
D309
4148
GND 4
RV303B
100k Snare Decay
D310
4148
D312
4148
GND 4
RV302B
A1M Kick Decay
GND 4
RV306B
10k Mix Bal
1
1
22
33
RV309A
A1M Clap Flam
1
1
22
33
RV301A
B1M Cym Decay
1
1
22
33
RV303A
100k Snare Decay
1
1
22
33
RV302A
100k Kick Decay
1
1
22
33
RV306A
10k Mix Bal
GND 4
RV305B
100k Clap Reverb
1
1
22
33
RV305A
100k Clap Reverb
1
2
3
4
5
6
JP302
C/B Interconnect 3
1
2
3
4
5
6
JP303
C/B Interconnect 2
1
2
3
4
5
6
JP304
C/B Interconnect 4
1
2
3
4
5
6
JP301
C/B Interconnect 1
1
10
11
12
2
3
4
5
6
7
8
9
JP305
C/B Interconnect 5
R338
10k
GNDA
1
2
3J311
Mix Out
1
2
3J314
Clap
1
2
3J313
Cymbal
1
2
3J312
OH
1
2
3J310
CH
1
2
3J309
Snare
1
2
3J308
Kick
D301
Accent LED
GNDA
1
2
3
J307
Cymbal G/T
+12V
R337
4.7k
D306
CY LED
R339
100k
1H301
Mounting Hole
1H304
Mounting Hole
1H303
Mounting Hole
1H302
Mounting Hole
VDD 16
VSS
8
U302C
4098
R309
100k
Q2 10
-TR2
11 +TR2
12
Reset2
13
Rx2_Cx2
14 Cx2
15
Q2 9
U303B
4098
Cx1
1
Rx1_Cx1
2
Reset1
3
+TR1
4
-TR1
5
Q1 6
Q1 7
U303A
4098
D302
Kick LED
R305
4.7k
+12V
R321
100k
GNDA
+12V
D304
Snare LED
R315
4.7k
+12V
C314
100n
C313
100n
C312
100n
GNDA
+12V
+12V
VDD 16
VSS
8
U303C
4098
R313
30k
R301
10k
GNDA
1
2
3
J306
Clap G/T
R326
10k
R327
10k
D313
4148
GNDA
1
2
3
J303
Accent G/T
+12V
R303
4.7k
D308
4148
R311
100k
GNDA
1
2
3
J305
OH G/T
GNDA
1
2
3
J302
CH G/T
+12V
R317
4.7k
D305
OH LED
1
2
3
J301
Kick G/T
GNDA
R322
100k
+12V
R307
4.7k
D303
CH LED
R310
100k
1
2
3
J304
Snare G/T
GNDA
MIX
CYDEC
CPREVCW
CPREVCCW
OHCHCY
CPSDBD
MIXRAW
BDGATE
SDGATE
ACCENV
CHGATE
OHGATE
BDDEC
BDPITCH
ACCENT
SDPITCH
SDPITCH
SDDECCW
BDPITCH
SDDECCCW
ACCENV
CYDEC
CP2
CP1
CHGATE
CPREVCW
CPREVCCW
CPSDBD
CYGATE
OHCHCY
MIXRAW
CYGATE
BDGATE
BD
SDDECCW
SD
BDDEC
SDGATE
CH
OH CY CP
MIX
CP
SDDECCCW
CH
ACCBUF
ACCBUF
ACCENT
CY
SD
OH
BD
CP1
CP2
OHGATE
1mS
1mS
10mS
0V
12V
SILKSCREEN (PCB-A)
© 2020 Weston Precision Audio
17
SILKSCREEN (PCB-B)
© 2020 Weston Precision Audio
18
SILKSCREEN (PCB-C)
© 2020 Weston Precision Audio
19
REVISION HISTORY
11: R129 should be 100k not 10k.
Updating docs and BOM.
10: Update build doc schematic and
interactive BOMs to match values for
RV302, R227, and LED Rs.
09: R340 was clipped of C build table.
08: 4.7k Rs on PCB-C were listed wrong
as 2k on build table. BOM was correct.
07: Add missing diodes to PCB-B build
table and note about D204/D205
06: Correct Small Bear knob PNs
05: Change Q205/R227 back
04: Update Q205/R227
03: Show electrolytic cap on C221
02: Update for BOM update (All PCB-C
LED Rs changed from 2k to 4.7k)
01: Initial release.
© 2020 Weston Precision Audio
20
Table of contents
