TABLE OF CONTENTS
Table of Contents 1
Inspection 1
Specifications 1
Introduction 2
Understanding Compression 2
Gating 2
Description 3
Front Panel 3
Rear Panel 4
Operation 4-5
Schematic 6
Warranty Back Cover
INSPECTION
1. Unpack and Inspect the RP252 package
Your RP252 was carefully packed at the factory in a protective carton.
Nonetheless, be sure to examine the unit and the carton for any signs of
damage that may have occurred during shipping. If obvious physical
damage is noticed, contact the carrier immediately to make a damage
claim. We suggest saving the shipping carton and packing materials for
safely transporting the unit in the future.
2. Please complete the Warranty Registration Card and return it to the
factory.
SPECIFICATIONS
Input Impedance: 10k9 balanced
Max Input Level: +21 dBu
THD: .05% typical
Threshold range: -40dBu to +10dBu
Attack Time: 1 - 10ms.
Release Time: 0.5 - 5 Sec.
Compression Ratio: 2:1 - infinity:1
Gate Threshold: -30 to +4 dB, and Off.
Output Gain: -10 - +20dB
Dimensions: 1.75" x 6" x 19"
(44mm x 152mm 483mm)
1 6
SCHEMATIC
1
ROLLS CORPORATION
5968 South 350 West
Salt Lake City, UT 84107
1
RP252.SCH
E
Rev:
Sheet of
Rb
COMPRESSOR / LIMITER / GATE RP252
POWER
IN
OUT
OUTPUT TRIM
+V
+V
-V
-V
+V +V
+V +V
-V
-V
-V
2K
X 5
2K
X 5
2K
X 5
2K
X 5
+4/-10
R126
51
R249
10K
R257
10K
R264
10K
R157
10K
R149
10K
1 2
3
J2
XLR F PC
I
1
G
2
O
3
U17
7812
C3
1U
I
2
G
1
O
3
U18
7912
1
2
3
SW2A
DPDT
C4
47U
R263
10K
R147 22K
R235
1M
1U
CR3
1N4148
R248 18K
D15, D16, D17, D18, D19
D20, D21, D22, D23, D24
D25, D26, D27, D28, D29
D10, D11, D12, D13, D14
R150 R152
R151
R153
R154
R158
R159
R160
R161
R162
R250
R252
R251 R253
R254
R258
R260
R259
Q10
J113
D32
LDRR
R148
18K
D34
LDRR
CR2
1N751
R2
R7
1M
1
2
3
4
5
6
7
8
9
U13 BA6125
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
U15 BA6125
1
2
3
4
5
6
7
8
9
U16 BA6125
R256
1K
R255
4.7K
R163
10K
R155
4.7K
D5
LDSG
R102
10K
R101
10K
C101
27PF
D1
1N4001
D2
1N4001
D3
1N4001
D4
1N4001
C5
503
Q4
J113
R135
1M
R134
470
5
6
7
8
U11B
4560
1
2
3
SW3A
DPDT
4
5
6
SW3B
DPDT
4
5
6
SW2B
DPDT
R103
10K
R104
100K
R145
100K
C210
10U
1
2
3
SW4A
4PDT
4
5
6
SW4B
4PDT
7
8
9
SW5C
4PDT
R146
10K
R105
10K
R233
R231
470
R232
4.7K
R133
470
C110
10U
R132
4.7K
7
8
9
I/0 DPDT X4
SW4C
R119
4.7K
R131
470
R164
10K
5
6
7
8
U12B
4560
2
3
1
4
U1A
4560
R3
4.7K
C217 503
R118
22K
R247
22K
CR1
1N751
R1
4.7K
R261
R262
R156
1K
C1
2 2 0 0 U F 1 6 V
C2
2 2 0 0 U F 1 6 V
1 2
J6
XLR JACK M
1
2
3
J10
XLR JACK M
GATE CLOSED
RELEASE
R116
10K
4
3
8
1
11
5
7
2
U3A
LM13600
13
14
9
16
6
12
10
15
U3B
LM13600
2
3
1
4
4560
C104
503
R143
100
R123
47K
R120
10K
R112
10K
R125
22K
R115
220K
R110
100K
R111
22K
C105
10U
P9
P100K
P8
P100K
R122
10
C107
120PF
THRESHOLD
SIDE CHAIN
J7
PHONE 1/4
C111
1U
2
3
1
4
U2A
LM358
C112
27PF
R137 47K
R136
22K
500K
P14
R109
2K
R108
33K
R144 100K
R124
6.8K
C103
120PF
C108
1U
6
5
7
8
U4B
4560
R127
R130
47K
R128
4.7K
R129
4.7K
C109
27PF
R117
1M
R114
47K
1
1
2
2
3
3
Q3
J113
D6
1N4148
C106
503
Q1
2N3904
RATIO
OFFSET
C102
1U
5
6
7
8
U2B
LM358
Q2
2N3904
D31
LDRR
P100K
R106
1K
R121
220K
J1
PHONE 1/4
J8
PHONE 1/4
J5 PHONE 1/4
J9
PHONE 1/4
ATTACK
RELEASE
R138
10K
R139
10K
R140
10K
D7
1N4148
5
6
7
8
U5B
4560
P12
C10K
D8
1N4148
R141
10K
P13
100K
C114
10UF
P11
500K
-V
-V
-V
-V
+V
+V
+V
+V
+V
+V
+V
+V
+V
-V
-V
R5
50K TP
OUTPUT TRIM
-V
-V
+4/-10
R226
51
1 2
3
J4
XLR F PC
R202
10K
R201
10K
C201
120PF
R203
10K
R204
100K
R245
100K
1
2
3
SW5A
4PDT
4
5
6
SW5B
4PDT
R246
10K
R205
10K
R219
4.7K
2
3
1
4
U6A
4560
R218
22K
GATE CLOSED
RELEASE
R216
4
3
8
1
11
5
7
2
U8A
LM13600
13
14
9
16
6
12
10
15
U8B
LM13600
2
3
1
4
4560
C204
503
R243
100
R223
47K
R220
10K
R212
10K
R207
100K
R225
22K
R215
220K
R210
100K
R211
22K
C205
10U
P2
P100K
P1
P100K
R222
10
C207
120PF
THRESHOLD
J11
PHONE 1/4
C211
1U
2
3
1
4
U7A
LM358
C212
27PF
R237
47K
R236
22K
P7500K
R209
2K
R208
33K
R244 100K
R224
6.8K
C203
120PF
C208
1U
6
5
7
8
U9B
4560
R227
18K
R230
47K
R228
4.7K
R229
4.7K
C209
27PF
R217
1M
R214
47K
1
1
2
2
3
3
Q9
J113
D9
1N4148
C206
503
Q7
2N3904
RATIO
OFFSET
C202
1U
5
6
7
8
U7B
LM358
Q8
2N3904
LDRR
P3
P100K
R206
1K
R221
220K
J3
PHONE 1/4
J12
PHONE 1/4
ATTACK
RELEASE
R238
10K
R239
10K
R240
10K
D35
1N4148
P5
C10K
D36
1N4148
R241
10K
P6
100K
C214
10UF
P4
500K
-V
-V
-V
-V
+V
+V
+V
+V
+V
+V
-V
-V
R6
50K TP
C117
.047
1
2
3
SW1A
DPDT
4
5
6
SW1B
DPDT
STEREO/MONO
D33
LDRG
R4
4.7K
-V
+V
E1
E3
E2
+V
-V
2
3
1
4
4560
3
2
1
4
U11A
4560
5
6
7
8
U10B
4560
2
3
1
4
U10A
4560
3
2
1
4
U12A
4560
+V
7
8
U1B
7
8
U6B
+V
+V
-V
-V
C8
.001
C9
.001
C10
.001
.001
R8
4.7K
R9
4.7K
C6
503
C7
503
C12 470PF
C13
470PF
D 3 8
1 N 4 1 4 8
D 3 7
1 N 4 1 4 8
D 4 0
1 N 7 5 1 A
D 3 9
1 N 7 5 1 A
R107
100K
U5A
3
R234
470
BYPASS
6
5
4560
6
5
4560
Size:
U9A
C11
U14 BA6125
Document Number:
Date: 14 October 2001
