Backyard Brains DIY SpikerBox v1.3 User manual
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SpikerBox*v1.3*DIY*Instructions*
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A"Soldering"Iron"can"be"purchased"at"RadioShack"or"any"local"hardware"store."The"Magnifying"
Glass"and"Silly"Putty"are"available"at"drug"stores."
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SPEAKER
10k10k
VCC
VCC
GND
220uF
0.047uF
10
0.1uF
VCC
33K
1k 0.47uF
220k
560pF
GND
GND
GND
GND
GND
10uF
390
AD623
VCC/2
VCC/2
VCC/2
VCC/2
TLC2272
VCC
VCC/2
GND
0.22uF
0.22uF
LM386N-1
GND
GND
2 1
SP1
R1R2
C3
C4
R3
C5
R4
C6
R6
R7 C7
R8
C8
C10
R5
1
2
3
8
6
U1
74
5
2
3
1
U2A
84
6
5
7
U2B
1
1
1
GND
1
AMP1
1
AMP2B
1
AMP3B
BATT3
BATT2
BATT1
LED2
1
SIG
R9
1
AMP2A
C1
C2
1
2
3
8
5
U3
64
7
1
AMP3A
REF
1
2
POWER
+-
+-
+-
20x Gain Audio Amplifier
<--- To Cockroach Leg
4xGain Instrumentation Amp
Audio Out
Speaker Out
RCA plug
A
B
C
D
E
1 2 3 4 5 6 7 8
A
B
C
D
E
1 2 3 4 5 6 7 8
Stage 1 Gain
Low-pass Filter
TLC2272
High-Pass filter
fc =
_
1
2π .r7.c7
fc =
_
1
2π .1x103. 0.047x10-6 = 338 Hz
fc =
_
1
2π .r7.c7
fc =
_
1
2π .220x103.560x10-12 = 1,291 Hz
Stage 2 GaIn Calculation
gain = R8/R7
= 220k/1k = 220x
XX
X
_
1,291 Hz
338 Hz
_
gain
220
frequency
But.. In reality it’s lower due to roll off:
only 174x at peak
gain = 1 + 100kΩ
_
R6
= 1 + 100kΩ
_
33kΩ
= 4.03x
174x Band-Pass Filter Stage
This turns 9V into +/- 4.5v
v0 = vIR2
R1+R2
_
=9v 10k
10k+10k
_
=4.5v Stage 3 Gain
Speaker Amp default
20x
Total GaIn
Headphone Out = 4x .174x
= 696x
Speaker = 4 x 174 x 20
= 13,920x
Backyard Brains
SpikerBox v. 1.3c
Dec 22, 2011
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