NFBF-10A
Notch Filter & Band-Pa
Manual Revision: 2014-08-20
Covers Hardware Revisions:
NFB
F-10: B & Higher
NFBF-10B
Notch Filter & Band-Pa
NFBF-10C
Notch Filter & Band-Pa
ss Filter (1200-2600 Hz)
ss Filter (700-3000 Hz)
ss Filter (80-200 Hz)
1
SPECIFICATIONS
Operating Voltage 12-18 VDC
Operating Current 3.8 mA
Operating Temperature -30 - +60 C
Input Level 20 mV – 1 V RMS
Input Impedance 600 Ohms
Frequency Range
NFBF-10A 1200-2600 Hz
NFBF-10B 700-3000 Hz
NFBF-10C 80-200 Hz
Band Width 0.5%
Device Gain or Loss Unity
Notch Filter Depth 30 dB
Audio Output Impedance 600 Ohms
Dimensions 3.6” L X 2.25” W X 1.52” H
GENERAL INFORMATION
Notch Filter: As a notch filter, the NFBF-10 will remove the undesirable tone from the incoming audio while
passing the rest of the audio. The NFBF-10A is often used to remove 2175 Hz keying tone from tone remote
systems going into a voice recorder. The NFBF-10C is used to remove CTCSS tones from audio.
Band-Pass Filter: As a band-pass filter, the NFBF-10 will block all audio except for the de sired frequency.
2
HARDWARE INSTALLATION
Be certain to follow standard anti-static procedures when handling any of Midian’s products.
Note: This product should be located at the destination point for the audio and not at the source of the audio on a
dry line.
J1: Input Connector: Connect pins J1:2 (red) and J1:3 (green) to the dedicated line coming from the audio
source.
J2: Output Connector: Connect pins J2:2 (red) and J2:3 (green) to the dedicated line going to the destination.
PL1: Power Input: Plug the supplied wall power adaptor into this connector. The wall power adaptor is 18 VDC
output and 110-220 VAC 50/60 Hz input.
HARDWARE ALIGNMENT
Band-Pass: Send the unit a 700 mV p-p signal on the Input line. Monitor P4 with an Oscilloscope or Sinadder. If
using an Oscilloscope tune R-13 (15 turn potentiometer) for maximum amplitude. If using a Sinadder tune R-13
for -12 to -10 dB of sinad. Use an Oscilloscope or Frequency Counter to read the tone frequency on the output.
Notch Filter: Send the unit a 700 mV p-p signal on the Input line. Monitor P5 with a Sinadder. Tune R-14 for -27
to -42 dB of sinad (-30 dB recommended). It may be necessary to tweak R-13 to get R-14 lower.
THEORY OF OPERATION
The NFBF-10 employs a High Q state variable filter. It also uses a 15 turn potentiometer that adjusts the
frequency based on the version ordered. The notch filter function is accomplished by summing the band-pass
audio with the incoming audio, resulting in phase cancellation at the adjusted frequency.
3
TECHNICAL NOTES
MIDIAN CONTACT INFORMATION
MIDIAN ELECTRONICS,
2302 East 22
nd
Street
INC.
Tucson, Arizona 85713 USA
Toll-Free: 1-800-MIDIANS
Main: 520-884-7981
E-mail: sales@midians.com
Web: www.midians.com
4
1
1
2
2
3
3
4
4
5
5
6
6
D D
C C
B B
A A
15K
R4
750K
R7
820K
R3
5.6K
R9
7.5K
R5
100K1%
R6
.001u 1%NPO
C4
100K1%
R10
.001u 1%NPO
C5
56K
R11
62K
R8
10K
R1
10K
R2
P1
P2
TONE IN
P3
TP5
GND GND GND GND
VA
GND
GND
2
1
3
PL1
.47u
C2
.47u
C3
470R
R15
4.7u
C7
10K
11
33
22
R13
*
F1
*
F2
*
D2
*
D3
*
Z3
*
Z4
*
F3
*
F4
*
D4
*
D5
0R
R17
0R
R21
0R
R25
0R
R26
500K
11
33
22
R27
10K
11
33
22
RP2
10K
11
33
22
RP3
10K
11
33
22
RP4
*
11
33
22
10K
RP1
200K
R34
.47u
C21
3.3K
R41
33K
R39
100K
R40
1K
R35
10K
R43
B25
Q1
200K
R38
4.7u
C27
5460
G
S D
Q2
VA
BALANCED OUT
UNBALANCED OUT
BALANCED IN
UNBALANCED IN
560p
C16
560p
C20
560p
C24
.47u
C15
.47u
C18
.47u
C22
LM660
-
+
2
3
1
411
U1:1
LM660
-
+
6
5
7
U1:2
LM660
-
+
9
10
8
U1:3
LM660
-
+
13
12
14
U1:4
VA
.47u
C9
.47u
C19
4.7u
C26
560p
C25
BLACK
J2:2
GREEN
J2:4
YELLOW
J2:5
BLUE
J2:6
RED
J2:3
WHITE
J2:1
YELLOW
J1:5
GREEN
J1:4
WHITE
J1:1
BLACK
J1:2
RED
J1:3
BLUE
J1:6
.47u
C12
620R
R16
.47u
C14
AGC
BYPASSED DC/RING VOLTAGE
UNBALANCED IN
MIXER1 IN
UNBALANCED IN
MIXER2 IN
560p
C17
33K
R12
*
R30
VA
FOR RF BYPAS
LIGHTNING PROTECTION
10K
R28
MIXER/NOTCH/BP/AGC/ADJUSTABLE GAIN OUT
MIXER/NOTCH/BP
AGC/ADJUSTABLE GAIN OUT
AGC PATH
ADJUSTABLE
GAIN PATH
NOTCH/MIXER
NOTCH/MIXER
WITHOUT AGC
WITH AGC
10K
R33
ADJUST
FREQUENCY
OUTPUT GAIN
NOTCH
0R
R22
10K
R31
DEPTH
*
R24
*
R19
*
R36
*
R42
10K
11
33
22
R14
1
2
3 4
5
6
T1:1
1
2
3 4
5
6
T2:1
LM7815
IN
1
GND
2
OUT
3
VR1
VER
A
B
C
R5 R9 R6 R10 R11
5.6K7.5K
1.8K 2.7K
1.2K 33K
100K1%
100K1%
100K1%
100K1%
475K1% 475K1%
56K
56K
51.1K1%
*
Z1
*
Z2
600 OHM
600 OHM
*
C29
*
C30
2.2u
C1
2.2u
C23
JP1:1
JP1:2
JP1:3
JP2:1
JP2:2
JP2:3
JP3:1
JP3:2JP3:3
JP4:1
JP4:2 JP4:3
BP OUT
JP5:1
JP5:2
HP OUT
JP5:3
LP OUT
JP5:4
HP FILTER
BP FILTER
LP FILTER
JP6:1
JP6:2
JP6:3
1u
C31
VAN VAN
VAN
VAN
VAN
VAN
EARTH GND
TP1
27K
R32
560p
C8
560p
C10
560p
C11
560p
C13
EP
CJS
2012-08-08 AWS
2014-09-15
D-1
1 of 2
7735
MIDIAN ELECTRONICS, INC.
DATE:
DESIGN:
UPD BY:
REV:
APPR
REV
SHEET
PROJECT NUMBER
DOCUMENT NAME
SCHEMATIC
Copyright © 2014
NFBF 10
-
+
3
1
4
52
LM321
U2
COR17
PIR1701
PIZ201PIZ202
PIR1702
COF1
COF2
PIF101PIF102
PIF201PIF202
COD2
COR19
PID201
PID202
COJP3:3
PID301
COD3
PID302
PIJP302
PIJP303
COJP3:1
COJP3:2
COR24
PIR1902
PIT101
PIR1901
PIJP301
PIT102
PIR2402
PIT103 PIT104
PIR2401
PIT106
PIT105
COT1:1
PIR1601
COR16
PIR1602
CORP1
COC14
PIRP101
PIRP102
PIRP103
PIR2202
COR22
PIR2201
PIC1402
PIC1401
PIR401
COR4
PIR402
COR7
PIR701 PIR702
PIR301
COR3
PIU102
PIU103
COU1:1
COC29
PIC2901 PIC2902
COJ1:3
PIJ103
COJ1:4
PIJ104
PIC3001 PIC3002
COC30
COZ1
PIZ101 PIZ102
PIC801
COC8
PIC802
PIC1002
COC10
PIC1001
COZ2
PIC901
PIC902
PIU104
PIU101
PIU1011
PIR1302
COC9
COJP5:3
COJP5:2
PIR302
PIR2101
COJ1:5
COJ1:2
COJ1:1
COJ1:6
COTP1
PIJ105
PIJ102
PIJ101
PIJ106
PIP201
COP2
COPL1
PIPL101
PIPL103
PIPL102
PITP101
PIC1601
PIC1602
PIC2001
PIC2002
PIC2401
PIC2402
PIC2602
PIC2601
PIP101
COP1
COC16
COC20
COC24
PIC2501
COC26
PIC2502
PIVR101
PIR2102
COR21
PIRP201
PIR3101
PIRP301
PIRP401
COVR1
COC25
COP3
COC15
PIRP202
PIRP203
CORP2
COR31
PIR3102
PIRP302
PIRP303
CORP3
PIRP402
PIRP403
CORP4
PIC1501 PIC1502
COC18
PIC1801 PIC1802
COC22
PIC2201 PIC2202
PIVR103
PIR102
COR1
PIVR102
PIC101
PIC102
COC1
PIR101
PIR201
COR2
PIR202
PIP301
PIC1701
COC17
PIC1702
PIC201
COC2
PIC202
COR14
PIJP101
COJP1:1
PIC301 PIC302
COJP1:2
PIJP102
PIJP103
COJP1:3
COC3
COJP6:1
PIJP601
PIJP602
COJP6:2
PIJP603
COJP6:3
PIR802
COR8
PIR801
PIR3202
COR32
PIR3201
COR34
PIR3401 PIR3402
COQ2
COC21
PIC2101 PIC2102
PIR4001
COR40
PIR4002
PIQ20D
PIQ20G
PIQ20S
PIC2702
COC27
PIC2701
PIU201
PIU203
PIR4101
COR41
PIR4102
PIC3101
COC31
PIC3102
PIR1303
COR13
PIR1301
PIR502
COR5
COR6
PIR501
PIJP502
PIR601 PIR602
PIJP503
COJP5:1
PIJP501
COJP5:4
PIJP504
PIR1101
COR11
PIR1102
PIR1401
PIR1402
PIR1403
PIC1901
PIC1902
PIU205
COU2
PIR3901 PIR3902
PIU204
PIU202
COR39
PIU106
PIU105
PIJP201
COJP2:1
COJP2:2
PIJP202
PIJP203
COJP2:3
COC19
PIR3502
COR35
PIR3501
PIR901PIR902
COR9
COC4
PIC401 PIC402
COU1:2
COR10
PIU107
COR12
PIR1201 PIR1202
PIU1013
COU1:4
PIU1012
PIU1014
PIR1001PIR1002
PIR2702
PIR2701
PIR2703
COR27
COC5
PIC501 PIC502
PIU109
COU1:3
PIU1010
PIR3002
COR30
PIR3001
PIU108
PIC701
PIC702
COC7
PITP501
PIR3301
COR33
PIR3302
PIR1502
COR15
PIC2302
COC23
PIC2301
PIR1501
PIT201
PIR3802
COR38
PIT202
PIR3801
PIQ10C
COQ1
PIQ10E
PIQ10B
PIR4301
COR43
PIT203 PIT204
COT2:1
PIR4302
COtb0sch1
COTP5
PIR3602
PIT206
PIR3601
PIT205
PIR4202
PIR4201
COR36
PIJP401
PIJP402
COJP4:1
COJP4:2
COD5
COR42
COC12
PIC1201 PIC1202
COD4
PID401
PID402
PIJP403
COJP4:3
PID501
PID502
COR28
PIR2801
COR25
PIR2501 PIR2502
PIF301PIF302
COF3
PIF401PIF402
COF4
PIR2601PIR2602
COR26
PIR2802
COZ3
PIZ301 PIZ302
PIZ401 PIZ402
COZ4
COC11
COC13
COJ2:1
PIJ201
COJ2:6
PIJ206
COJ2:5
PIJ205
COJ2:2
PIJ202
COJ2:3
PIJ203
PIC1101
PIC1102
PIC1302
PIC1301
COJ2:4
PIJ204
COVO2
COMH1
PAJP302PAJP301 PAJP303
COJP3
PAP301
COP3
PAC802
COC8
PAJP102PAJP101 PAJP103
PARP103
CORP1
PARP102
PARP101
COJP1
PAMH101
PAJ208
PAC1002
PAC801
COC10
PAT104PAT105PAT106
PAC1001
COT1
PAT107
PAT108
PAT101 PAT102 PAT103
COC30
PAC3002 PAC3001
COVR1
PAP201
PAPL101
COPL1
COP2
PAVR103PAVR102PAVR101
COMH4
COJ1
PAPL103
PAPL102
COP1
PAP101
PAMH401
PAVO207
PAJ107 PAJ108
PAJ202
PAJ201 PAJ205
PAJ206PAJ204
PAJ203
COJ2
PAJ207
PAC2902
COC29
COVO4
PAC2901
PAJ103
PAVO205
PAVO206 PAVO204
PAJ106 PAJ104
PAJ101PAJ105
PAJ102
PAVO208
COMH2
PAMH201
COC13
PAC1301PAC1302
PARP403
CORP4
PARP402
PARP401
COR31
PAR3102PAR3101
PARP203
CORP2
PARP202
PARP201
PARP303
CORP3
PARP302
PARP301
COR14
PATP501
PAR1402PAR1401
PAVO202PAVO201
PAVO203
PAR1403
PAR1303
COMH3
PAMH301
PAJP202 PAJP201PAJP203
COC11
COJP4
PAC1101PAC1102
PAT207
COT2
PAT201
PAT202
PAT203
COTP5
PAR1001
COR10
PAR1002
PAT208
COR6
PAR602 PAR601
PAC401
PAC402
COC4
PAR702
COR7
PAR701
COR27
PAR1302
PAJP602
PAJP601 PAJP603
COJP6
COJP2
PAJP401
PAJP402
PAJP403
PAT206
PAT205
PAT204
COTP1
PATP101
PAR2702PAR2701
PAR2703
PAR1301
COR13
PAJP503
PAJP502
PAJP504
COJP5
PAJP501
COtb0sch1
COVO3
PAR3602
COR36
PAR3601
PAR4202
COR42
PAR4201
COR12
PAR1202 PAR1201
PAR301
PAR302
COR3
COR25
PAR2502
PAR2501
COF3
PAZ302
PAZ301
COZ3
PAF302 PAF301
COD4
PAD401
COD5
PAD402
PAD502 PAD501
COF4
COR26
PAR2602 PAR2601
PAF402 PAF401
COZ4
PAZ401PAZ402
COR30
COR15
PAR1501
PAVO302
PAVO301
COC5
PAC502
PAC501
PAVO308PAVO309
PAVO3010PAVO3011PAVO3012PAVO3013PAVO3014
PAU108
PAU109
COU1
PAU101 PAU102 PAU103 PAU104 PAU105
COR4
COR5
PAR502 PAR501
PAU1010PAU1011PAU1012PAU1013PAU1014
PAU106
PAVO303 PAVO304 PAVO305 PAVO306 PAVO307
PAR402PAR401
PAU107
COC9
COR43
COC27
PAC2702
COR35
COR33
COR39
PAR3901
COC19
PAC701
PAR3002PAR3001
PAC702
COC7
PAR1502
PAR2802 PAR2801
COC12
PAR1102
COR11
PAR1101
COR9
PAC902PAC901
PAR4301
PAR4302
PAC2701
PAVO30G
PAR3502PAR3501
PAR3302PAR3301
PAR3902
PAC1901
PAC1902
COR28
COC3
PAC302
PAVO30B
PAQ10B
COQ1
PAC2301
COC23
PAC2302
PAVO30E
PAQ10E
PAQ20S
PAVO30S
COQ2
PAQ20G
PAVO30D
PAQ20D
PAC2101
COU2
PAC2102
COC21
PAU205
PAU204
COR40
PAU202
PAU201 PAU203
COC31
COR41
PAR4102PAR4101
COC22
PAC2202PAC2201
PAR3202 PAR3201
COC15
PAC1202PAC1201
PAC1502PAC1501
PAC1701
COC18
PAC1802
PAC1801
COR8
PAR802PAR801
PAR902PAR901
PAC301
COR38
PAR3802
PAR3801
PAVO30C
PAQ10C
PAR3402
COR34
PAR3401
PAR4002PAR4001
PAC3102PAC3101
COR32
COC17
PAC1702
PAC1602
PAC2402
PAC1601
PAC2401
COC16
COC24
COR21
PAR2102PAR2101
COF2
PAF201
COZ2
PAZ201
PAZ202
PAR102
COR1
PAR101
COC14
PAC1402
PAC1401
PAR2201
COR22
PAR2202
COR16
PAR1601PAR1602
COD3
PAD302 PAD301
COF1
PAF102 PAF101
PAF202
PAR2402PAR2401
PAC2502
COC25
PAC2501
COR19
PAR1902PAR1901
PAC2601
COC26
PAC2602
COR24
COZ1
PAZ101PAZ102
PAR1701
COR17
PAR1702
COD2
PAD202 PAD201
PAC2001
COC20
PAC2002
COtb0sch2
PAC201
PAR201
COR2
COC2
PAC202
PAR202
PAC101
COC1
PAC102
Loading...