eml 101 voltage controlled filter

1 2 3 4 5 6 7 8 A B C D 8 7 6 5 4 3 2 1 D C B A +V +V +V +V -10V -10V -10V -10V -10V -V -V Eref KBD1/ SEQ CV KBD2 VCF CV MIXER FROM Eref Filter KBD Track CV EXPONENTIAL AMP 1.2V/OCT VCF Cutoff VCF Mode LPF BPF HPF VCF OUT TO VCA LPF Out BPF Out HPF Out Res (Q) VCF Input FROM VCF Mix REF Voltage -10V 1 9 10 +V -V +15V -15V GND -V 8 6 5 uA 726 +V 4K7 50K 10K 10K 470R 1K5 BC550 BC550 1K5 2K2 6K8 4K7 50K 1K 10K 2K49 10K 10K 10K 2K49 470R 37K4 100R 1N4148 uA 726 5K6 267R 1K5 22K 8K2 5K 15K 1K5 1N4148 22K1 10K 10K 470R 15K 3K6 3K6 3K6 3K6 10R 10R 1K 10R 10R 1K 100K 100K 15K 1K 50K 100K 100K 3K6 3K6 3K6 3K6 1M5 1M5 221K 100n 3p3 C 6n C 6n C 6n C 6n 1n 100n ZENER 8V2 VCF OUT MIXER CURRENT DRIVERS INTEGRATORS TRANSISTOR PAIR 1 PAIR 2 TRANSISTOR 3 2 6 U1 TL071 3 2 6 U2 TL071 3 2 6 U3 TL071 3 2 6 U4 TL071 3 2 6 U5 TL071 3 2 6 U6 TL071 3 2 6 U7 TL071 3 2 6 U8 TL071 3 2 6 U10 TL071 3 2 6 U9 TL071 Cutoff 50K 50K 50K ORIGINAL ICs : U1,3,4,5,6,10 = uA741 U2 = 1456 U7,8,9 = uA748 U11 = uA726 TR. PAIR 1,2 = TD101 Use TL071 for all ICs, for Tr. pair use matched NPNs (~1mV) or tr. pairs like MAT02 or 2SC1583, or you can use CA3046 or CA3086 instead, with pins showed in brackets, and use it for expo tranny also, but you lose uA726 heated stability so you must consider using separate CA with heating and sensing transitor shceme (like shared with VCO expos). You can put discrete NPN in place of 726 and lose some temp. tracking, but it's not crucial in VCF. Q1,2 are labeled "14", use some NPNs. Capacitors C can be changed with some higher values for different effect. (12) (14) (13) (1) (2) (3) (4) (5) (6) (9) (8) (11) (7) (10) EML-101 Multimode VCF 1998. Drawn by Marjan Urekar

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Filter schematic for the EML 101 synthesizer

TRANSCRIPT

1 2 3 4 5 6 7 8

A

B

C

D

87654321

D

C

B

A

+V +V+V +V

-10V -10V

-10V

-10V

-10V-V

-V

Eref

KBD1/SEQ CV

KBD2 VCF CVMIXER

FROM

Eref

FilterKBD Track

CV

EXPONENTIAL AMP 1.2V/OCTVCF Cutoff

VCF ModeLPF

BPF

HPFVCF OUT

TO VCA

LPF Out

BPF OutHPF Out

Res (Q)VCF Input

FROMVCF Mix

REF Voltage -10V

1

910

+V

-V

+15V

-15V

GND

-V

8

6

5

uA 726

+V

4K7

50K

10K

10K

470R

1K5

BC550BC550

1K5

2K2

6K8

4K7

50K

1K

10K2K49

10K

10K

10K

2K49

470R

37K4

100R1N4148

uA 7265K6

267R

1K5

22K

8K2

5K

15K

1K5

1N4148

22K1

10K

10K 470R

15K

3K6 3K6

3K6 3K6

10R 10R

1K

10R10R

1K

100K

100K15K

1K

50K

100K

100K

3K63K6 3K63K6

1M51M5

221K

100n

3p3

C

6n

C

6n

C

6n

C

6n

1n

100n

ZENER 8V2

VCF OUT MIXER

CURRENT DRIVERS

INTEGRATORS

TRANSISTOR PAIR 1 PAIR 2

TRANSISTOR

3

26

U1

TL071

3

26

U2

TL071

3

26

U3

TL071

3

26

U4

TL071

3

26

U5

TL071

3

26

U6

TL071

3

26

U7

TL071

3

26

U8

TL071

3

26

U10

TL071

3

26

U9

TL071

Cutoff

50K

50K 50K

ORIGINAL ICs :U1,3,4,5,6,10 = uA741 U2 = 1456U7,8,9 = uA748U11 = uA726TR. PAIR 1,2 = TD101

Use TL071 for all ICs, for Tr. pair use matched NPNs (~1mV) or tr. pairs likeMAT02 or 2SC1583, or you can use CA3046 or CA3086 instead, with pinsshowed in brackets, and use it for expo tranny also, but you lose uA726heated stability so you must consider using separate CA with heating andsensing transitor shceme (like shared with VCO expos). You can put discrete NPN in place of 726 and lose some temp. tracking, but it's not crucial in VCF.Q1,2 are labeled "14", use some NPNs.Capacitors C can be changed with some higher values for different effect.

(12)

(14)

(13)

(1)

(2)

(3)

(4)

(5)(6)

(9)

(8)(11)

(7) (10)

EML-101 Multimode VCF1998. Drawn by Marjan Urekar