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G1176 - FET compressor

Categories
AudioDIY:Pro Audio
Features
Schematics | PCB layout | Instructions | PCB for sale
PSU
 

"The 1176 is a well-known and classic FET compressor. No tubes, but a nice solid-state do-it-yourself project. It is an adaption of the original UREI 1176 LN to components and parts that are available (mostly) everywhere today. Adaption include changing to standard European transistor types, modernizing component values, using Lundahl transformers, and rotary switches for easier front panel layout."

There is another version by MNATS witch also has PCB's available.

Gyraf M.NATS Cinemag alternative
NPN BD517 BD135 or BD139
PNP BD518 BD136 or BD140
Input trans. LL1540 OEP A262A2E? or LL1540 CMMI-2C
Output trans. LL5402 OEP A262A2E? or LL5402 CMOQ-2S

The designators below are for the MNATS version.

Images
Urei 1176LN
Urei 1176LN
Capacitors
Value Count Type LS Designators Note  
10p
1
Ceramic
2.5
C12
 
27p
1
Ceramic
5
C6
 
33p
1
Ceramic
5
C16
(Legacy Item?) Pin 8 is NC on TL071
47p
1
Ceramic
2.5
C29
 
100p
2
Ceramic
5
C100 C101
 
220p
3
Ceramic
5
C3 C4 C32
 
22n
1
Polyester/Mylar
5
C22
 
100n
2
Polyester/Mylar
5
C28 C35
 
220n
2
Polyester/Mylar
5-10
C5 C27
 
1u
3
Polyester/Mylar
12.5-20
C1 C10 C17
 
6u8
2
Tantalum
5
C19 C20
35V (or electrolytic)
10u
4
Electrolytic
 
C23 C30 C31 C33
35V
22u
1
Electrolytic
 
C14
35V
47u
4
Electrolytic
 
C9 C11 C18 C34
35V
100u
5
Electrolytic
 
C2 C7 C8 C13 C21
35V
470u
1
Electrolytic
 
C15
35V
1000u
2
Electrolytic
 
C24 C26
35V
1000u
1
Electrolytic
 
C25
50V
Resistors
Value Count Type Designators Note  
4r3
2
5%
R40 R41
Carbon
82
1
1%
R19
 
100
1
1%
R36
 
150
2
1%
R15 R87
 
180
3
1%
R13 R14 R73
 
220
1
1%
R89
 
270
1
1%
R65
 
470
2
1%
R42 R76
 
560
1
1%
R43
 
1k
5
1%
R10 R37 R84 R85 R86
 
1k1
1
5%
R87
1W Carbon
1k2
2
1%
R38 R39
 
1k5
1
1%
R44
 
1k8
1
1%
R20
 
2k
1
1%
R32
 
2k2
1
1%
R45
 
2k4
2
1%
R64 R72
 
3k6
2
1%
R51 R59
 
3k9
1
1%
R83
 
4k3
2
1%
R34 R49
 
4k7
2
1%
R63 R70
 
6k8
1
1%
R17
 
7k5
1
1%
R21
 
7k68
1
1%
R71
 
8k2
1
1%
R50
Only in MNATS version
10k
11
1%
R8 R28 R35 R52 R56 R82 R1A R1B R1C R1D R1E
 
10k
2
1%
R* R*1
Only if using Lundahl input transformer
11k
1
1%
R33
 
15k
1
1%
R53
 
22k
1
1%
R18
 
27k
1
1%
R6
 
38k3
1
1%
R67
 
44k2
1
1%
R69
 
47k
5
1%
R23 R62 R68 R74 R75
 
56k
3
1%
R2 R24 R26
 
68k
2
1%
R25 R31
 
100k
3
1%
R3 R4 R58
 
182k
1
1%
R66
 
200k
1
1%
R30
 
270k
1
1%
R79
 
470k
2
1%
R57 R61
 
560k
1
1%
R11
 
1m
3
1%
R12 R29 R60
 
2m2
2
5%
R7 R9
Carbon
3m9
1
5%
R48
Carbon
10m
1
1%
R46
 
10k
1
Potmeter lin
R5
 
25k
1
Potmeter lin
R77
Use log or lin
100k
1
Potmeter log
R27
Use log or lin
5m
1
Potmeter log
R78
Use log or lin
100
1
Trimpot
R16
 
2k
2
Trimpot
R55 R81
 
100k
1
Trimpot
R54
 
IC sockets
Type Needed
DIL-8
DIL-8
2
 

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