Classic Audio Products, Inc.Classic Audio Products, Inc.Classic Audio Products, Inc.
Categories
500 Series Rack Kits (37)

Aluminum Control Knobs (23)

Assembled Modules (3)

Attenuators (3)

Capacitors (3)

CAPI Attire (6)

CAPI Nip-N-Tuck Bundles (16)

Connectors (30)

Diodes/Rectifiers (1)

Faders (2)

Floor Box PSU (17)

HiZ Plug-Ins (10)

LED Indication

Meters (1)

Misc Hardware & Bits

Modular Console & Rack Parts (18)

Op Amps (34)

PCB's & Kits (71)

Potentiometers (8)

PSU Items (4)

Relays (6)

Resistors (1)

Ribbon Mic Preamps (2)

Switches (18)

Tools (5)

Transformers (14)

Transistors (4)

Specials
Newest Products
Goto...
What's New? more
CAPI 511_1-8-DB25 Back Panel
CAPI 511_1-8-DB25 Back Panel
$20.65
Information
Shipping & Returns
Privacy Notice
Reviews & Testimonials
Audio & Video Clips
Links
Authorized Builders
DOA Install
Support Documents
About Us
Contact Us
Support Documents & Build Guides Support Documents & Build Guides
MAKE SURE the build guide you follow matches the Revision of the PCB you are building!

Table of Contents
Microphone Preamplifiers
   VP25 & VP26
   VP28
   VP312
   VP312DI
HiZ Plug-Ins
FC526 Compressor/Limiter
Equalizers
   LC25 & LC40
   BT50
   553F
   LC53A
VC528 ML2 Audio Bacon
Opamps & Followers
Eleven Space Racks
Floor Box PSU's
ACA/Summing
Miscellaneous PCB's
2-Stage Line Amp PCB
 
VP25 & VP26 Preamplifiers Back to Top
***PLEASE NOTE: While the original VP2x Assembly Guide is a bit outdated, it is still overall very relevant and recommended reading no matter what kit you are building. The BOM's shown in the VP2x Assembly Guide are not to be used for the new black PCB's. If you do not follow the newer BOM's, you will end up with a non-functioning preamp. Make sure to get the component's placement from the current BOM's.

***PLEASE NOTE: MAKE SURE the build guide and BOM you follow matches the Revision of the PCB you are building!

Rev B
  VP2x Rev B BOM  [Last upload 9/16/2015]
  VP25 Rev B schemo  [Last upload 9/17/2015]
  VP26 Rev B schemo  [Last upload 9/17/2015]
  VP25 Rev B overlay  [Last upload 9/16/2015]
  VP26 Rev B overlay  [Last upload 9/16/2015]

Rev C
  VP25 & VP26 Rev C BOM  [Last upload 5/24/2016]
  VP26 Rev C schemo  [Last upload 5/24/2016]
  VP26 Rev C overlay  [Last upload 5/24/2016]

All Rev's
  Old VP2x Assembly Guide  [Last upload 9/16/2015]
  Important VP2x Rev B & C Addendum  [Last upload 9/16/2015]
  VP2x Rev B & C Hardware BOM  [Last upload 9/16/2015]
  VP-Gainswitch Rev A.1 schemo  [Last upload 9/16/2015]
  VP-Gainswitch Option install guide  [Last upload 9/16/2015]
  3mm LED install for VP2x build
  Proper DOA install on a fresh module build
  VP2x support thread at groupdiy.com
 
VP28 2-Stage Preamplifier Back to Top
***PLEASE NOTE: MAKE SURE the build guide and BOM you follow matches the Revision of the PCB you are building!
Rev A
  VP28 Main Rev A PCB BOM  [Last upload 9/16/2015]
  VP28 553-Sub-HPF PCB BOM  [Last upload 9/17/2015]
  VP28 Rev A.2 Top Overlay  [Last upload 9/17/2015]
  VP28 Rev A.2 Bottom Overlay  [Last upload 9/17/2015]
  VP28 553-Sub-HPF Overlay  [Last upload 9/17/2015]

Rev B
  VP28 Rev B Addendum  [Last upload 3/18/2016]
  VP28 Main Rev B PCB BOM  [Last upload 3/18/2016]
  VP28 Sub-HPF Rev A PCB BOM  [Last upload 3/18/2016]
  VP28 Rev B.1 Top Overlay  [Last upload 3/18/2016]
  VP28 Rev B.1 Bottom Overlay  [Last upload 3/18/2016]
  VP28 Sub-HPF Rev A Overlay  [Last upload 3/18/2016]
  VP28 Rev B Test Points Guide  [Last upload 3/18/2016]

All Rev's
  VP28 Assembly Aid Rev 1  [Last upload 9/16/2015]
  VP28 new style hardware BOM  [Last upload 9/17/2015]
  VP28 VP-Gainswitch schemo  [Last upload 9/17/2015]
  Proper DOA install on a fresh module build
  VP28 support thread at groupdiy.com
 
VP312 VPR & 51x Preamplifiers Back to Top
***PLEASE NOTE: While the original VP2x Assembly Guide is a bit outdated, it is still overall very relevant and recommended reading no matter what kit you are building. The BOM's shown in the VP2x Assembly Guide are not to be used for the new black PCB's. If you do not follow the newer BOM's, you will end up with a non-functioning preamp. Make sure to get the component's placement from the current BOM's.

***PLEASE NOTE: MAKE SURE the build guide and BOM you follow matches the Revision of the PCB you are building!

Rev A
  VP312xxx Rev A PCB BOM  [Last upload 9/17/2015]
  VP312-VPR Rev A overlay  [Last upload 9/18/2015]
  VP312-51x Rev A overlay  [Last upload 9/18/2015]
  VP312-VPR Rev A schemo  [Last upload 9/17/2015]
  VP312-51x Rev A schemo  [Last upload 9/17/2015]

Rev B
  VP312xxx Rev B PCB BOM  [Last upload 3/26/2016]
  VP312-VPR Rev B overlay  [Last upload 3/26/2016]
  VP312-VPR Rev B schemo  [Last upload 3/31/2016]

All Rev's
  Old VP2x Assembly Guide  [Last upload 9/16/2015]
  VP-Gainswitch Rev A.1 schemo  [Last upload 9/16/2015]
  VP-Gainswitch Option install guide  [Last upload 9/16/2015]
  3mm LED install for VP312
  Proper DOA install on a fresh module build
  VP312 500 & 51x support thread at groupdiy.com
 
VP312DI Preamplifier with Direct Inject Back to Top
***PLEASE NOTE: While the original VP2x Assembly Guide is a bit outdated, it is still overall very relevant and recommended reading no matter what kit you are building. The BOM's shown in the VP2x Assembly Guide are not to be used for the new black PCB's. If you do not follow the newer BOM's, you will end up with a non-functioning preamp. Make sure to get the component's placement from the current BOM's.

***PLEASE NOTE: MAKE SURE the build guide and BOM you follow matches the Revision of the PCB you are building!

Rev C
  VP312DI Rev C Main PCB BOM  [Last upload 9/18/2015]
  VP312DI Rev C overlay  [Last upload 9/18/2015]
  VP312DI Rev C.1 schemo  [Last upload 9/18/2015]

Rev D Docs
  VP312DI Rev D Main PCB BOM  [Last upload 2/2/2016]
  VP312DI Rev D overlay  [Last upload 2/2/2016]
  VP312DI Rev D schemo  [Last upload 2/2/2016]

All Rev's
  Old VP2x Assembly Guide  [Last upload 9/16/2015]
  VP312DI Sub DI.1 PCB BOM  [Last upload 9/18/2015]
  VP312DI Sub DI.2 PCB BOM  [Last upload 9/18/2015]
  VP312DI Rev C 500/VPR mod  [Last upload 9/18/2015]
  Plug-In-Rly.1 Rev A.2 schemo  [Last upload 9/15/2015]
  Plug-In-Rly.1 Rev A.2 overlay  [Last upload 9/15/2015]
  VP-Gainswitch Rev A.1 schemo  [Last upload 9/16/2015]
  VP-Gainswitch Option install guide  [Last upload 9/16/2015]
  Proper DOA install on a fresh module build
  VP312DI support thread at groupdiy.com
 
HiZ Plug-Ins Back to Top
FET1
  FET1 BOM  [Last upload 9/18/2015]
  FET1 schemo  [Last upload 9/18/2015]

IC1
  IC1 BOM  [Last upload 9/18/2015]
  IC1 schemo  [Last upload 9/18/2015]
 
FC526 Compressor/Limiter Back to Top
  FC526 assembly aid Rev_1  [Last upload 9/18/2015]
  FC526 Rev A.2 main PCB BOM  [Last upload 9/18/2015]
  FC526 Rev A.2 meter PCB BOM  [Last upload 9/18/2015]
  FC526 Rev A hardware BOM  [Last upload 9/18/2015]
  FC526 Rev A.2 main PCB overlay  [Last upload 9/18/2015]
  FC526 Rev A.2 meter PCB overlay  [Last upload 9/18/2015]
  FC526 calibration guide Rev_1  [Last upload 9/18/2015]
  FC526 test points Rev_2  [Last upload 9/18/2015]
  FC526 meter zero adjustment  [Last upload 9/18/2015]
  Proper DOA install on a fresh module build
  FC526 support thread at groupdiy.com
 
553F Equalizer Back to Top
  553F assembly aid Rev_1  [Last upload 9/19/2015]
  553F-VAR main PCB BOM  [Last upload 9/19/2015]
  DF.3 PCB BOM  [Last upload 9/19/2015]
  553F Sub-HPF PCB BOM  [Last upload 9/19/2015]
  553F Sub-LPF PCB BOM  [Last upload 9/19/2015]
  553F hardware BOM  [Last upload 9/19/2015]
  553F Rev A overlay  [Last upload 9/19/2015]
  553F small boards overlay  [Last upload 9/19/2015]
  553F test points  [Last upload 9/19/2015]
  Proper DOA install on a fresh module build
  553F support thread at groupdiy.com
 
LC53A Equalizer Back to Top
***PLEASE NOTE: MAKE SURE the build guide and BOM you follow matches the Revision of the PCB you are building!
Rev A
  LC53A main PCB BOM  [Last upload 9/19/2015]
  LC53A CB PCB BOM  [Last upload 9/19/2015]
  LC53A LC-EP PCB BOM  [Last upload 9/19/2015]
  LC53A main Rev A.2 overlay  [Last upload 9/19/2015]
  LC53A CB Rev A.1 overlay  [Last upload 9/19/2015]
  LC53A LC-EP Rev A.2 overlay  [Last upload 9/19/2015]
  DF.2 Build Guide & BOM  [Last upload 9/19/2015]
  DTO5 Build Guide & BOM  [Last upload 9/19/2015]
  VC528 CMRR Adjustment  [Last upload 9/15/2015]

Rev B
  LC53A Rev B Addendum  [Last upload 3/5/2016]
  LC53A main Rev B PCB BOM  [Last upload 3/5/2016]
  LC53A CB Rev B PCB BOM  [Last upload 3/5/2016]
  LC53A LC-EP Rev B PCB BOM  [Last upload 3/5/2016]
  LC53A main Rev B overlay  [Last upload 3/5/2016]
  LC53A CB Rev B overlay  [Last upload 3/5/2016]
  LC53A LC-EP Rev B overlay  [Last upload 3/5/2016]
  DF.2 Rev B Build Guide & BOM  [Last upload 3/5/2016]
  DTO5 Rev B Build Guide & BOM  [Last upload 3/5/2016]
  LC53A Rev B Test Points  [Last upload 3/6/2016]

All Rev's
  LC53A assembly aid Rev_1  [Last upload 9/19/2015]
  Grayhill stop pins for CB PCB  [Last upload 9/19/2015]
  Grayhill stop pins for LC-EP PCB  [Last upload 9/19/2015]
  Proper DOA install on a fresh module build
  LC53A support thread at groupdiy.com
 
VC528 ML2 Audio Bacon Back to Top
  VC528 ML2 assembly aid Rev_1  [Last upload 9/19/2015]
  DF.1 Support Docs  [Last upload 9/15/2015]
  VC528 main PCB BOM  [Last upload 9/20/2015]
  VC528 push switch PCB BOM  [Last upload 9/20/2015]
  VC528 trim switch PCB BOM  [Last upload 9/20/2015]
  VC528 filter PCB BOM  [Last upload 9/20/2015]
  VC528 hardware BOM  [Last upload 9/20/2015]
  VC528 main Rev B.2 overlay  [Last upload 9/20/2015]
  VC528 small boards overlay  [Last upload 9/20/2015]
  Grayhill stop pins for VC528  [Last upload 9/20/2015]
  Proper DOA install on a fresh module build
  ML2 support thread at groupdiy.com
 
Opamps & Followers Back to Top
***PLEASE NOTE: MAKE SURE the build guide you follow matches the Revision of the PCB you are building!
gar918
  gar918BC Assembly Guide  [Last upload 1/26/2016]
  gar918 support thread at groupdiy.com

gar1731
  gar1731 Q2V3 Assembly Guide  [Last upload 9/15/2015]
  gar1731 V4.1 Assembly Guide  [Last upload 10/12/2015]
  gar1731 support thread at groupdiy.com

gar2520
  gar2520BC-Q2 Assembly Guide  [Last upload 9/15/2015]
  gar2520BC V4.1 Assembly Guide  [Last upload 10/12/2015]
  gar2520 support thread at groupdiy.com

BB2521 Hybrid
  BB2521 Support Docs  [Last upload 9/15/2015]
  BB2521 Hybrid support thread at groupdiy.com

Discrete Voltage Follower #1
  DF.1 Support Docs  [Last upload 9/15/2015]
 
Eleven Space Racks Back to Top
Current 511-VPR Rev's
  Temp 511 Assembly Aid .zip  [Last upload 6/24/2017]

Old 51x-VPR Rev's
  VPR rack assembly aid Rev_1  [Last upload 9/20/2015]
  51x rack assembly aid Rev_1  [Last upload 9/20/2015]

All Rev's
  VPR / 51x rack support thread at groupdiy.com
 
Floor Box PSU's Back to Top
  Floor Box PSU assembly aid Rev_2  [Last upload 9/20/2015]
  **Floor Box PSU SNET IEC addendum**  [Last upload 9/20/2015]
  Floor Box PSU PCB BOM  [Last upload 9/20/2015]
  Floor Box PSU hardware BOM  [Last upload 9/20/2015]
  GDIY51PSU-V2 Rev A.1 schemo  [Last upload 9/20/2015]
  GDIY51PSU-V2 Rev A.1 overlay  [Last upload 9/20/2015]
  VPR toroidal transformer datasheet
  51x toroidal transformer datasheet
  Floor Box PSU support thread at groupdiy.com
 
ACA/Summing Back to Top
CAPI 2-ACA-Booster
  Rev B ACA build tips  [Last upload 9/20/2015]
  2-ACA-Bo Rev B.1 BOM  [Last upload 9/20/2015]
  2-ACA-Bo Rev B.1 schemo  [Last upload 9/20/2015]
  2-ACA-Bo Rev B.1 overlay  [Last upload 9/20/2015]
  2-ACA-Bo support thread at groupdiy.com

CAPI Inverting ACA
  Rev B ACA build tips  [Last upload 9/20/2015]
  Inv-ACA Rev B BOM  [Last upload 9/20/2015]
  Inv-ACA Rev B schemo  [Last upload 9/20/2015]
  Inv-ACA Rev B overlay  [Last upload 9/20/2015]
 
Miscellaneous PCB's Back to Top
GH71 Stepped Pot Adapter PCB
  Stepped Pot Adapter schemo  [Last upload 9/15/2015]

Plug-In Relay.1
  Plug-In-Rly.1 Rev A.2 schemo  [Last upload 9/15/2015]
  Plug-In-Rly.1 Rev A.2 overlay  [Last upload 9/15/2015]
 
2-Stage Line Amp PCB Back to Top
The 2-Stage Line Amp card needs a CMRR adjustment to function properly. Conceptually, the common mode adjustment is identical to that of the ML2, 553F or LC53A. The incoming single ended sine wave will need to go thru a pair of 0.1% precision R's and then into the 1st stage input. These R's can be anywhere from 750R to 1k. The place to monitor the signal level is the negative end of C9. The trimmer to adjust is RV1. Please use the following ML CMRR adjustment pdf to give you the gist.
  VC528 CMRR Adjustment  [Last upload 9/15/2015]
  2-Stage Line Amp BOM  [Last upload 9/15/2015]
Continue
Shopping Cart more
0 items
Curative Notice
Classic Audio Products, Inc. is not affiliated with API. Customers and fans should not refer to Classic Audio Products, Inc. as "Classic API." API is a registered trademark of Automated Processes Incorporated. Classic Audio Products, Inc. has no affiliation with Automated Processes Incorporated.
Bestsellers
01.gar2520 DOA Full Kit Bundle
02.DOA PCB Socket Set
03.gar2520 DOA PCB
04.Toneluck 2PDT Pushbutton Switch
05.C&K Black Bullet Switch Cap
06.C&K White Bullet Switch Cap
07.EA2622 Input Transformer
08..156" KK Female Terminal Contact
Manufacturers
Quick Find
 
Use keywords to find the product you are looking for.
Advanced Search
Reviews more
VP26 Entire Bundle (Stepped)
I am not a DIY guy, but I own a soldering iron. I decided ..
5 of 5 Stars!

Copyright © 2017 Classic Audio Products, Inc.
Powered by osCommerce