Page 1
R26
820
1
A3A
RC4558
3
7.5K
10K
10K
0.47
6
C3
C2
C1
RC4558
R1
D2 1N914
D11N914
TANT.
RC4558
0.0022
0.022
0.1
PRE-
AMP
4
68K
8
R5
GAIN
-V
13K
R3
+V
6
2
10K
C5
+V
0.0018
R15
3.3M
R14
R16 27K
100K
+V
4
-V
2
SQUELCH
R12
-V
R11
R13
15K
FULL WAVE RECTIFIER
R10
C4
3
7
A2B
5
R9
33K
R8
3.3K
700 HZ LOW PASS FILTER
R7
2.2K
1
1
A2A
8
3
2
R2
4.7K
C12
7
A3B
5
R6
100K LIN
GUITAR
R4
470
C13
0.47
TANT.
RC4558
D7
D6
D5
D4
0.082
R27
R28
OCTAVE
100K LIN
1N914
1N914
-V
1N914
1N914
4.7K
R29
4
1
A7A
RC4558
STOP DETECTOR
4
-V
C11
A4A
R24
5
27K
TRIGGER
TANT.
1.0
1
2
1K
7
6
C10
22K
2.2K
3.3K
560
R31
100K LIN
RC4558
3
R25
RC4558
0.1
C9
1.0
C8
2.2
C7
-V
2
22K
R23
4.7
R30
8
47K
TANT.
A6A
4
8.2K
4
LOG AMP
A4B
R22
R21
SMOOTHING FILTER
R20
R19
R18
NORMALLY LOW
PULSES HIGH
8
R33
330
3
R32
2.2K
+V
-V
+V
D3 1N914
A5B
5
1
3
2
C6
1.0
AT END OF
NOTE
+V
-V
390K
SQUELCH
SMALL SIGNAL
DETECTOR
A5A
8
3
7
RC4558
6
RC4558
8
A7B
RC4558
5
+V
R44
1
RC4558
4
R43
1K
2
R42
820K
R41
PEAK FOLLOWER
+V
7
7
6
ATTACK DETECTOR
R45
330K
-V
-V
220
A6B
SQUARE WAVE
MODULATOR
NORMALLY -8V
PULSES HIGH ON
ATTACK
470
D10
D8 1N914
R39
120K
C16
4.7
5
6
7
Q1
6 HIGH ON SILENCE
1N914
D11
1N914
D9 1N914
R40
0 TO -7V DEPENDING
ON SIGNAL
R38
22K
RC4558
2N5087
A8
+V
REVISION: 12/12/78
DESIGNED BY: D.COCKERELL
ELECTRO HARMONIX
ELECTRO HARMONIX BASS MICRO SYNTHESIZER
A DRAWN BY: FABIAN P. HARTERY 1
Date: September 28, 1996 Sheet 1 of 3
Size Document Number REV
Title
TO VCF (A10)
5
6.8K
TO ADAPTIVE SCHMITT TRIGGER
TO VCA SWEEP GENERATOR
TO SUB-OCTAVE TRACK & HOLD MODULATOR (A18) & OUTPUT
2436
1
5
R37
13K
R36
100K LIN
SQUARE WAVE
6 5 1
8
CA3094
(or EH1040)
7
3
2
R35
4
10K
TO VCF SWEEP GENERATOR
7
-V
SQUARE WAVE SHAPER
J1/INPUT
1/4" PHONEJACK
R17
2.7K
SQUARE WAVE SHAPER
C14
R34
2.7K
1.0
C15
0.047
* ALL CAPACITOR VALUES IN MICROFARADS
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