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+V C5 0.0018

R15

+V 8 A2A A2B 5 7 6 RC4558 4 D2 1N914 2 6 7 5 A3B RC4558 C12 0.47 TANT. C13 OCTAVE 100K LIN R28 4 R29 8.2K 4 A4A 1 3 RC4558 8 +V D3 7 6 8 RC4558 3 1 2 PEAK FOLLOWER R41 220 SQUARE WAVE MODULATOR -V A6B Q1 5 7 6 2N5087 RC4558 0 TO -7V DEPENDING ON SIGNAL D11 1N914 R38 22K 7 R40 6.8K 1 2 5 13K 3 6 7 TO ADAPTIVE SCHMITT TRIGGER TO VCA SWEEP GENERATOR TO VCF SWEEP GENERATOR TO SUB-OCTAVE TRACK & HOLD MODULATOR (A18) & OUTPUT 4 5 TO VCF (A10) ELECTRO HARMONIX DESIGNED BY: D.COCKERELL REVISION: 12/12/78 D9 1N914 C16 4.7 R39 120K D8 1N914 D10 1N914 6 HIGH ON SILENCE R42 820K RC4558 R43 1K 4 -V R45 470 ATTACK DETECTOR NORMALLY -8V PULSES HIGH ON ATTACK R44 330K 5 7 6 7 A7B RC4558 A5A SQUELCH SMALL SIGNAL DETECTOR +V 1N914 -V +V R32 390K -V R30 2.2K R25 22K C11 1.0 -V TANT. TRIGGER R31 100K LIN 4 2 3 R33 330 A7A RC4558 0.082 R27 4.7K GUITAR R6 100K LIN D1 R5 13K 1N914 8 +V PREAMP GAIN R3 10K R4 470 RC4558 0.47 TANT. C1 0.1 C2 0.022 C3 0.0022 10K 10K 7.5K R10 2 3 RC4558 R12 C4 FULL WAVE RECTIFIER R11 3 4 A3A 1 R7 2.2K 700 HZ LOW PASS FILTER R8 R9 3.3K 33K 1 R13 15K -V -V

3.3M R14 100K SQUELCH R16 27K

J1/INPUT 1/4" PHONEJACK

R2

3

4.7K

2

1

R1 68K

-V

D4 D5 D6 D7 1N914 1N914 A4B LOG AMP 5 7 C10 0.1 6 1K RC4558 R23 47K R24 2 -V 1N914 1N914 R26 820

R18 27K 560 3.3K 2.2K C8 2.2 22K C9 1.0

R19

SMOOTHING FILTER R20 R21 R22

-V A6A 1 A5B 5 C7 4.7 TANT.

R17

C6

4

STOP DETECTOR 1

2

2.7K

1.0

3

RC4558

SQUARE WAVE SHAPER

8

NORMALLY LOW 8 PULSES HIGH AT END OF NOTE +V

+V

+V

C14 SQUARE WAVE R36 100K LIN R37

R34

3

1.0 4 CA3094 (or EH1040)

2.7K C15 0.047

R35 2

A8 1 8 6 5

10K

-V

SQUARE WAVE SHAPER

* ALL CAPACITOR VALUES IN MICROFARADS

Title ELECTRO HARMONIX BASS MICRO SYNTHESIZER Size Document Number A DRAWN BY: FABIAN P. HARTERY Date: September 28, 1996 Sheet

1

of

REV 1 3

ADAPTIVE SCHMIDT TRIGGER R49 220 2 SUB-OCTAVE TRACK & HOLD MODULATOR -V 1 +V R57 27K 3 2 A18 8 R56 47K C21 0.1 -V 7 +V D16 1N914 R70 22M -V R68 1K +V +V Q3 2N5087 R71 680K 7 3 R72 1K 2 3 A13 1 8 6 5 5 6 8 1 0.0033 7 C25 4 A10 CA3094 /EH1040 2 R75 3.3K R76 8.2K R77 47K R78 1K R69 12K -V -V A11 CA3094 /EH1040 2 3 4 R79 3.3K -V -V A12 CA3094 /EH1040 R80 8.2K R81 5 6 8 1 0.0033 C26 7 47K 2 R82 1K 3 2.2K D17 1N5235 6.8V R73 SWEEP RATE R74 100K LIN R64 10K -V R59 470 -V R60 27K R62 12K -V 4 4 R55 3.9K R58 470 2 1 0 A17B CD4013 5 D CLK R Q 11 9 3 12 +V CLK 13 Q S D 6 5 47K Q R A17A 6 CD4013 1 S Q CA3094 EH1040) 7 (OR 1 8 6 C22 5 +V 3 47K 8 C19 4.7 TANT. R48 10K 4

-V

R46 1N914

R47

3

5

3.3K

3.3K

A15B RC4558 D13 7 A15A RC4558 R53 1

6

D12 1N914

C17 0.0033

+V

0.0033

R50 6.8K R52 220 R51 10K C20 4.7 TANT. A16B RC4558 R54 7

8

Q2 2N4302 C23 R61 100K LIN SUB-OCTAVE 1.0

3 1N914 D14 1N914

A16A RC4558 D15 1

C18 0.1

2

4

-V S-R FLIP FLOP & DIVIDE BY TWO SPECIAL NOTE: PIN 14 IS CONNECTED TO THE POWER SUPPLY GROUND AND PIN 7 IS CONNECTED TO THE -V SUPPLY.

-V

R63 10K

+V

STOP FREQUENCY R66

8

U9A RC4558

C24 0.082

3

R65 100K LIN

3.3K

1

2

R67 820

-V R83 3.3K 4 5 6 8 1 0.0033 7 C27 R84 8.2K

-V

4

-V

R92 100K LIN R105 1 +V 4 R96 47K R97 1K TANT. C29 1.0 -V 5 2 1K CA3094 D18 (OR EH1040) 4 1N5235 6.8V -V C28 10 TANT.

START FREQUENCY R93 R95

3.3K

4.7K R94 820

+V +V R87 330K R88 47K R89 4.7K 47K RESONANCE R86 100K LIN +V R85

-V 7 A14 3 2 4 -V Q4 2N5088 VCA CA3094 (OR EH1040)

J2/OUTPUT 1/4" PHONEJACK R104 1K R98 47K 1 8 6 5

S1 FOOTSWITCH

+V

R91 470

R90 1K

R100 22K

R99 47

2N5088

2N5088

Q5

R102

6

Q6

8.2K

D19 1N914

R103 820

C30 10

-V

R101 100K LIN ATTACK DELAY

ELECTRO HARMONIX DESIGNED BY: D.COCKERELL REVISION: 12/12/78

TANT.

* ALL CAPACITOR VALUES IN MICROFARADS

Title ELECTRO HARMONIX BASS MICRO SYNTHESIZER Size Document Number B DRAWN BY: FABIAN P. HARTERY Date: September 28, 1996 Sheet 2 of

REV 1 3

2N6110 NORMALLY TOO HOT TO TOUCH R109 12K 2N6110 R111 680 (+9 Vdc RELATIVE TO A1, PIN 2) +V

Outboard, a.c. transformer Q5 P1 R108 1K 8 PHONEPLUG 3 1 D22 1N914 5.6K RC4558 4 + 2 R107 R110 4.7K A1A D20 LED

120 Vac Primary 24 Vac Secondary

N.C.

J1/POWER BR1 W02M C31 100 35V R106 15K

C32 10 25V

1/8" PHONEJACK A1B 6 7 5 RC4558 D21 1N961B 10V -V (-10 Vdc RELEVANT TO A1, PIN 2) C33 10 25V

POWER JACK-ISOLATED (SOME NON-DOMESTIC MODELS) 24 VAC

ELECTRO HARMONIX DESIGNED BY: D.COCKERELL REVISION: 12/12/78 Title ELECTRO HARMONIX BASS MICRO SYNTHESIZER Size Document Number A DRAWN BY: FABIAN P. HARTERY Date: September 28, 1996 Sheet

3

of

REV 1 3

+V C5 0.0018

R15

+V 8 A2A A2B 5 7 6 RC4558 4 D2 1N914 2 6 7 5 A3B RC4558 C12 0.47 TANT. C13 OCTAVE 100K LIN R28 4 R29 8.2K 4 A4A 1 3 RC4558 8 +V D3 7 6 8 RC4558 3 1 2 PEAK FOLLOWER R41 220 SQUARE WAVE MODULATOR -V A6B Q1 5 7 6 2N5087 RC4558 0 TO -7V DEPENDING ON SIGNAL D11 1N914 R38 22K 7 R40 6.8K 1 2 5 13K 3 6 7 TO ADAPTIVE SCHMITT TRIGGER TO VCA SWEEP GENERATOR TO VCF SWEEP GENERATOR TO SUB-OCTAVE TRACK & HOLD MODULATOR (A18) & OUTPUT 4 5 TO VCF (A10) ELECTRO HARMONIX DESIGNED BY: D.COCKERELL REVISION: 12/12/78 D9 1N914 C16 4.7 R39 120K D8 1N914 D10 1N914 6 HIGH ON SILENCE R42 820K RC4558 R43 1K 4 -V R45 470 ATTACK DETECTOR NORMALLY -8V PULSES HIGH ON ATTACK R44 330K 5 7 6 7 A7B RC4558 A5A SQUELCH SMALL SIGNAL DETECTOR +V 1N914 -V +V R32 390K -V R30 2.2K R25 22K C11 1.0 -V TANT. TRIGGER R31 100K LIN 4 2 3 R33 330 A7A RC4558 0.082 R27 4.7K GUITAR R6 100K LIN D1 R5 13K 1N914 8 +V PREAMP GAIN R3 10K R4 470 RC4558 0.47 TANT. C1 0.1 C2 0.022 C3 0.0022 10K 10K 7.5K R10 2 3 RC4558 R12 C4 FULL WAVE RECTIFIER R11 3 4 A3A 1 R7 2.2K 700 HZ LOW PASS FILTER R8 R9 3.3K 33K 1 R13 15K -V -V

3.3M R14 100K SQUELCH R16 27K

J1/INPUT 1/4" PHONEJACK

R2

3

4.7K

2

1

R1 68K

-V

D4 D5 D6 D7 1N914 1N914 A4B LOG AMP 5 C10 0.056 6 1K RC4558 R23 47K 7 R24 2 -V 1N914 1N914 R26 820

R18 27K 560 3.3K 2.2K C8 1.0 22K C9 0.47

R19

SMOOTHING FILTER R20 R21 R22

-V A6A 1 A5B 5 C7 4.7 TANT.

R17

C6

4

STOP DETECTOR 1

2

2.7K

1.0

3

RC4558

SQUARE WAVE SHAPER

8

NORMALLY LOW 8 PULSES HIGH AT END OF NOTE +V

+V

+V

C14 SQUARE WAVE R36 100K LIN R37

R34

3

1.0 4 CA3094 (or EH1040)

2.7K C15 0.047

R35 2

A8 1 8 6 5

10K

-V

SQUARE WAVE SHAPER

* ALL CAPACITOR VALUES IN MICROFARADS

Title ELECTRO HARMONIX GUITAR MICRO SYNTHESIZER Size Document Number A DRAWN BY: FABIAN P. HARTERY Date: September 28, 1996 Sheet 1

of

REV 1 3

ADAPTIVE SCHMIDT TRIGGER R49 220 2 SUB-OCTAVE TRACK & HOLD MODULATOR -V 1 +V R57 27K 3 2 A18 8 R56 47K C21 0.1 -V 7 +V D16 1N914 R70 22M -V R68 1K +V +V Q3 2N5087 R71 680K 7 3 R72 1K 2 3 A13 1 8 6 5 5 6 8 1 0.0033 7 C25 4 A10 CA3094 /EH1040 2 R75 3.3K R76 8.2K R77 47K R78 1K R69 2.2K -V -V A11 CA3094 /EH1040 2 3 4 R79 3.3K -V -V A12 CA3094 /EH1040 R80 8.2K R81 5 6 8 1 0.0033 C26 7 47K 2 R82 1K 3 2.2K D17 1N5235 6.8V R73 SWEEP RATE R74 100K LIN R64 10K -V R59 470 -V R60 27K R62 12K -V 4 4 R55 3.9K R58 470 2 1 0 A17B CD4013 5 D CLK R Q 11 9 3 12 +V CLK 13 Q S D 6 5 47K Q R A17A 6 CD4013 1 S Q CA3094 EH1040) 7 (OR 1 8 6 C22 5 +V 3 47K 8 C19 4.7 TANT. R48 10K 4

-V

R46 1N914

R47

3

5

3.3K

3.3K

A15B RC4558 D13 7 A15A RC4558 R53 1

6

D12 1N914

C17 0.0033

+V

0.0033

R50 6.8K R52 220 R51 10K C20 4.7 TANT. A16B RC4558 R54 7

8

Q2 2N4302 C23 R61 100K LIN SUB-OCTAVE 1.0

3 1N914 D14 1N914

A16A RC4558 D15 1

C18 0.1

2

4

-V S-R FLIP FLOP & DIVIDE BY TWO SPECIAL NOTE: PIN 14 IS CONNECTED TO THE POWER SUPPLY GROUND AND PIN 7 IS CONNECTED TO THE -V SUPPLY.

-V

R63 10K

+V

STOP FREQUENCY R66

8

U9A RC4558

C24 0.082

3

R65 100K LIN

3.3K

1

2

R67 820

-V R83 3.3K 4 5 6 8 1 0.0033 7 C27 R84 8.2K

-V

4

-V

R92 100K LIN R105 1 +V 4 R96 47K R97 1K TANT. C29 1.0 -V 5 2 1K CA3094 D18 (OR EH1040) 4 1N5235 6.8V -V C28 10 TANT.

START FREQUENCY R93 R95

3.3K

4.7K R94 820

+V +V R87 330K R88 47K R89 4.7K 47K RESONANCE R86 100K LIN +V R85

-V 7 A14 3 2 4 -V Q4 2N5088 VCA CA3094 (OR EH1040)

J2/OUTPUT 1/4" PHONEJACK R104 1K R98 47K 1 8 6 5

S1 FOOTSWITCH

+V

R91 470

R90 1K

R100 22K

R99 47

2N5088

2N5088

Q5

R102

6

Q6

8.2K

D19 1N914

R103 820

C30 10

-V

R101 100K LIN ATTACK DELAY

ELECTRO HARMONIX DESIGNED BY: D.COCKERELL REVISION: 12/12/78

TANT.

* ALL CAPACITOR VALUES IN MICROFARADS

Title ELECTRO HARMONIX GUITAR MICRO SYNTHESIZER Size Document Number B DRAWN BY: FABIAN P. HARTERY Date: September 28, 1996 Sheet 2 of

REV 1 3

2N6110 NORMALLY TOO HOT TO TOUCH R109 12K 2N6110 R111 680 (+9 Vdc RELATIVE TO A1, PIN 2) +V

Outboard, a.c. transformer Q5 P1 R108 1K 8 PHONEPLUG 3 1 D22 1N914 5.6K RC4558 4 + 2 R107 R110 4.7K A1A D20 LED

120 Vac Primary 24 Vac Secondary

N.C.

J1/POWER BR1 W02M C31 100 35V R106 15K

C32 10 25V

1/8" PHONEJACK A1B 6 7 5 RC4558 D21 1N961B 10V -V (-10 Vdc RELEVANT TO A1, PIN 2) C33 10 25V

POWER JACK-ISOLATED (SOME NON-DOMESTIC MODELS) 24 VAC

ELECTRO HARMONIX DESIGNED BY: D.COCKERELL REVISION: 12/12/78 Title ELECTRO HARMONIX GUITAR MICRO SYNTHESIZER Size Document Number A DRAWN BY: FABIAN P. HARTERY Date: September 28, 1996 Sheet 3

of

REV 1 3