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ZCON-Big Red-DI Partial Parts Kit
ZCON-Big Red-DI Partial Parts Kit
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MAKE SURE the build guide you follow matches the Revision of the PCB you are building!

Table of Contents
CAPI Discrete Opamps
  CA-0252-DIY Rev A Pictorial Build Guide
Microphone Preamplifiers
   VP25 Rev C ~ Variable Gain
   VP26 Rev C ~ Stepped Gain
   VP28
   VP312
   VP312DI
HiZ Plug-Ins
FC526 Compressor/Limiter
Equalizers
   LC25 & LC40
   BT50
   553F
   LC53A
VC528 ML2 Audio Bacon
Opamps & Followers
511-VPR Eleven Space Racks
Floor Box PSU's
ACA/Summing
Miscellaneous PCB's
2-Stage Line Amp PCB
SumBus ACA ~ Summing Mixer
HPA500 ~ Headphone Amplifier
 
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 & C (C is identical to B with the square input option added)
  VP28 Rev B Addendum  [Last upload 3/18/2016]
  VP28 Main Rev B-C PCB BOM  [Last upload 3/17/2024]
  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***PLEASE NOTE: While the original VP2x Assembly Guide is a bit outdated, it is still overall very relevant and recommended reading no matter what kit you are building.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!

***HELPFUL HINT: Even though the BOM is different, you can still use the VP25 Pictorial Build Guide as a solid reference for the VP312 build.

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 & C (C is identical to B with the square input option added)
  VP312xxx Rev B PCB BOM  [Last upload 3/17/2024]
  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 3/17/2024]
  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
CAPI ZCON Versions
  FET-ZCON1 BOM  [Last upload 1/7/2018]

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
***PLEASE NOTE: MAKE SURE the build guide and BOM you follow matches the Revision of the PCB you are building!
FC526 Original Rev
  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

FC526-XFMR
  DTO5 build page
  FC526-XFMR Rev A main PCB BOM  [Last upload 8/3/2017]
  FC526-XFMR Rev A meter PCB BOM  [Last upload 8/3/2017]
  FC526-XFMR Rev A hardware BOM  [Last upload 8/3/2017]
  FC526-XFMR Rev A main PCB overlay  [Last upload 8/3/2017]
  FC526-XFMR Rev A meter PCB overlay  [Last upload 8/3/2017]
  FC526-XFMR calibration guide Rev_1  [Last upload 8/3/2017]
  FC526-XFMR test points Rev_1  [Last upload 8/3/2017]
  FC526-XFMR meter zero adjustment  [Last upload 8/3/2017]
  Proper DOA install on a fresh module build
 
553F Equalizer Back to Top
***PLEASE NOTE: Although the original 553F assembly aid was written with the Rev A in mind, it is still overall very relevant and recommended reading for the Rev B kit. Just keep in mind that the receiver amp section is different and there is no longer any calibration required. Honestly, if you can't use the Rev A doc and the new BOMs to get thru this easy build…maybe DIY is not for you. No offense intended.

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

Rev B
  553F-VAR Rev B main PCB BOM  [Last upload 8/26/2018]
  DTO7 PCB BOM  [Last upload 8/26/2018]
  DF.3 PCB BOM  [Last upload 8/26/2018]
  553F Rev B Sub-HPF PCB BOM  [Last upload 8/26/2018]
  553F Rev B Sub-LPF PCB BOM  [Last upload 8/26/2018]
  553F Rev B hardware BOM  [Last upload 8/26/2018]
  553F Rev B top overlay  [Last upload 8/26/2018]
  553F Rev B bottom overlay  [Last upload 8/26/2018]
  553F Rev B filter overlays  [Last upload 8/26/2018]
  DTO7 and DF.3 overlays  [Last upload 8/26/2018]
  553F Rev B Test Points  [Last upload 8/26/2018]

All Rev's
  553F assembly aid Rev_1  [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
***PLEASE NOTE: MAKE SURE the build guide and BOM you follow matches the Revision of the PCB you are building!
Rev B.2
  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 main Rev B.2 overlay  [Last upload 9/20/2015]
  VC528 small boards overlay  [Last upload 9/20/2015]

Rev B.3
  VC528 main PCB BOM  [Last upload 5/6/2019]
  VC528 push switch PCB BOM  [Last upload 5/6/2019]
  VC528 trim switch PCB BOM  [Last upload 5/6/2019]
  VC528 filter PCB BOM  [Last upload 5/6/2019]
  VC528 main Rev B.3 PCB top overlay  [Last upload 5/6/2019]
  VC528 main Rev B.3 PCB bottom overlay  [Last upload 5/6/2019]
  VC528 filter PCB overlays  [Last upload 5/6/2019]
  VC528 small board overlays  [Last upload 5/6/2019]

All Rev's
  VC528 ML2 assembly aid Rev_1  [Last upload 9/19/2015]
  DF.1 Support Docs  [Last upload 9/15/2015]
  VC528 hardware BOM  [Last upload 5/6/2019]
  Grayhill stop pins for VC528  [Last upload 5/6/2019]
  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!
garOA10
  garOA10 Assembly Guide  [Last upload 8/18/2019]
  garOA10 support thread at groupdiy.com

garAM10
  garAM10 Assembly Guide  [Last upload 4/29/2018]
  garAM10 support thread at groupdiy.com

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]

CAPI CA-0252-DIY Rev A ~ Vintage 2520 Style Discrete Opamp
  CA-0252-DIY Rev A Pictorial Build Guide
 
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 RV2. 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]
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