Classic Audio Products, Inc.Classic Audio Products, Inc.Classic Audio Products, Inc.

~FYI~~Public Service Announcement~~FYI~

Since the USPS has become extremely unreliable, DHL or UPS will be used for all International Priority and Express packages and some First Class packages. All domestic packages will be shipped via UPS.

Categories
500 Series Rack Kits (38)

Aluminum Control Knobs (22)

Assembled Modules (5)

Attenuators (3)

Capacitors (1)

CAPI Attire (1)

CAPI Clamshell Series (7)

CAPI Nip-N-Tuck Bundles (18)

Connectors (32)

DI's (Direct Inject) (1)

Diodes/Rectifiers (1)

Faders

Floor Box PSU (16)

Headphone Amps (2)

HiZ Plug-Ins (4)

Inductors (2)

LED Indication

Meters (1)

Misc Hardware & Bits

Modular Console & Rack Parts (19)

Op Amps (41)

Op Amps (CAPI Style) (4)

PCB's & Kits (66)

Potentiometers (6)

PSU Items (5)

Relays (6)

Resistors (1)

Ribbon Mic Preamps

SSL Solid State Logic Cards (2)

SumBus ACA ~ Summing Mixer (23)

Switches (20)

Tools (7)

Transformers (15)

Transistors (3)

Specials
Newest Products
Goto...
What's New? more
Heider® H2 CAPIRRUNE Mic / Line Preamplifier
Heider® H2 CAPIRRUNE Mic / Line Preamplifier
US$949.00
Information
Shipping & Returns
Privacy Notice
Reviews & Testimonials
Audio & Video Clips
Links
DOA Install
Support Documents
About Us
Contact Us
CA-0252-DIY Rev A ~ Discrete Opamp Pictorial Build Guide
MAKE SURE the build guide you follow matches the Revision of the PCB you are building!

Table of Contents
1. Information, Documents & Downloads
2. Parts Identification and Recommended Tools
    A. Resistors and Diodes
    B. Capacitors and Transistors
    C. Recommended Tools

3. Let's Build This Thang!
4. Copyright Notice and Disclaimer
 
1. Information, Documents & Downloads Back to Top
Preface
    The CA-0252-DIY Rev A ~ Discrete Opamp Pictorial Build Guide is written with the intermediate builder in mind. If you have successfully built another kit or two and have good soldering skills, you should be fine.

FYI, I do not suggest testing a freshly built opamp with a freshly built module. If things are not working right, you will have no way of knowing if it is the opamp or the module.

BOM (Bill Of Materials)
  CA-0252-DIY Rev A PCB BOM  [Last upload 4/4/2020]

PCB Overlay
  CA-0252-DIY Rev A Overlay  [Last upload 4/5/2020]

Schematic
  The schematic for the CA-0252 is not published.

Support Thread
  CA-0252-DIY Rev A ~ Discrete Opamp [Build] support thread at groupdiy.com
 
2.A Parts Identification - Resistors and Diodes Back to Top
Click to enlarge
Click to download
2.A.1 Use this Resistor Sorting Chart to help keep your parts straight.
Click to enlarge
Click to download
2.A.2 Properly identifying and sorting the resistors is very important. This task can be done many ways. If you wanna roll old school, click the pic to the left to download my Resistor Color Code Chart. Pay special attention to distinguish the difference between values like 390R and 3k9 as well as 470R and 47k! This is a common trap for the inexperienced. If you are unsure about the color codes, PLEASE use a good DMM.
Click to enlarge
Click to enlarge
2.A.3 The best way is to use a high quality DMM (digital multimeter) that has an Auto Range function.
Click to enlarge
Click to enlarge
2.A.4 If your DMM has a Manual Range, make sure you have it set properly or you will get no reading or even a false reading.
Click to enlarge
Click to enlarge
2.A.5 Note the different range settings used to identify the high value resistor.
Click to enlarge
Click to enlarge
2.A.6 Once properly identified, all of the resisters can be bent over a small jeweler's screwdriver or similar. I like to make sure the color codes ALL read from the top down. Keeping them consistent makes double checking your work later very easy.
Click to enlarge
Click to enlarge
2.A.7 Fairchild 1N914 diode, label is "91 4B"
Click to enlarge
Click to enlarge
2.A.8 Bend all six 1N914 diodes over a small jeweler's screwdriver or similar, like we did with the resistors. I like to keep ALL black bands indicating the cathode or negative end pointing upwards away from the PCB.
 
2.B Parts Identification - Capacitors and Transistors Back to Top
Click to enlarge
Click to download
2.B.1 Use this Capacitor and Transistor Sorting Chart to help keep your parts straight.
Click to enlarge
Click to enlarge
2.B.2 4pF ceramic capacitor, label is "4."
Click to enlarge
Click to enlarge
2.B.3 47pF ceramic capacitor, label is "47"
Click to enlarge
Click to enlarge
2.B.4 1000pF ceramic capacitor, label is "102"
Click to enlarge
Click to enlarge
2.B.5 BC237C transistor, label is "BC 237C"
Click to enlarge
Click to enlarge
2.B.6 TIS97 transistor, label is "TIS97"
Click to enlarge
Click to enlarge
2.B.7 2N5087 transistor, label is "2N 5087"
Click to enlarge
Click to enlarge
2.B.8 BC141-16 transistor, label is "BC141-16"
Click to enlarge
Click to enlarge
2.B.9 BC161-16 transistor, label is "BC161-16"
 
2.C Recommended Tools Back to Top
Click to enlarge
Click to enlarge
2.C.1 A long conical tip for your soldering iron is invaluable for fine detailed work. We have a Hakko iron so we use the T18-DL12 tip for it.
Click to enlarge
Click to enlarge
2.C.2 Kester 24-6337-8807 small diameter no-clean solder is all we've been using for years. If you've never tried it, do so. It'll change your life!
Click to enlarge
Click to enlarge
2.C.3 We highly suggest MicroCare VeriClean No-Clean Flux Remover. Not only for this build but all of your PCB projects.
 
3. Let's Build This Thang! Back to Top
Click to enlarge
Click to enlarge
3.0 And we begin with the customary blank canvas.
Click to enlarge
Click to enlarge
3.1 I like to start with the components that are closest to the PCB. In this case its the ceramic capacitors. Using the BOM for locations and values, install them now.
Click to enlarge
Click to enlarge
3.2a If you haven't done so yet, bend all six 1N914 diodes over a small jeweler's screwdriver or similar. I like to keep ALL black bands indicating the cathode or negative end pointing upwards away from the PCB.
Click to enlarge
Click to enlarge
3.2b Install all of the diodes. Don't forget, the arrow in the silkscreen points to the end of the diode with the black cathode band. Solder only from the bottom of the PCB.
Click to enlarge
Click to enlarge
3.3a If you haven't done so yet, sort and identify all resistors. Bend resistors over a small jeweler's screwdriver or similar. I like to make sure the color codes ALL read from the top down. Keeping them consistent makes double checking your work later very easy.
Click to enlarge
Click to enlarge
3.3b I have grouped the resistors into 3 steps for maximum efficiency. Of course YMMV. Using the BOM for locations and values, install R5, R13 and R15. Solder only from the bottom of the PCB.
Click to enlarge
Click to enlarge
3.3c Using the BOM for locations and values, install R4, R6, R14, R16 and R17. Solder only from the bottom of the PCB.
Click to enlarge
Click to enlarge
3.3d Using the BOM for locations and values, install all remains resistors. Solder only from the bottom of the PCB.
Click to enlarge
Click to enlarge
3.3e Double check your work.
Click to enlarge
Click to enlarge
3.3f And also double check from this angle.
Click to enlarge
Click to enlarge
3.4a Slip the TO-39 spacers over the leads of each metal can output transistor. The little bumps in the spacers will be away from the transistors so they will be resting on the PCB.
Click to enlarge
Click to enlarge
3.4b Install the output transistors in their respective locations. Make absolute sure the label on the can matches the part location on the BOM. For an extra precaution, the component values are also on the PCB silkscreen. THESE PARTS ARE NOT INTERCHANGEABLE SO DO NOT SWAP THEM AROUND!! I like to alternate devices while soldering as to not heat up a part more than necessary.
Click to enlarge
Click to enlarge
3.4c Double check to make sure you have the output transistors in their proper places.
Click to enlarge
Click to enlarge
3.5a Inspect the TO-92 transistors. If any of them have their middle lead kinked backwards, we will have to deal with that.
Click to enlarge
Click to enlarge
3.5b You can easily straighten a kinked middle lead with the flat area of any pliers.
Click to enlarge
Click to enlarge
3.5c If the outer leads are not kinked to .1" centers, slightly bend them outwards.
Click to enlarge
Click to enlarge
3.5d Using the BOM for locations and values, install Q4, Q5 and Q9. If the leads are kinked to .1" centers they will drop right in. If they are straight, slightly bend them outwards as mentioned in the last step. Insert them and gently wiggle side to side while pressing downwards. Push in so they approximately match the height of all other components on the board. Solder only from the bottom of the PCB, alternating between parts to not overheat anything.
Click to enlarge
Click to enlarge
3.5e Using the BOM for locations and values, install Q6 and Q7. Solder only from the bottom of the PCB, alternating between parts to not overheat anything.
Click to enlarge
Click to enlarge
3.5f Using the BOM for locations and values, install Q1, Q2 and Q3. Solder only from the bottom of the PCB, alternating between parts to not overheat anything.
Click to enlarge
Click to enlarge
3.5g The heights of all TO-39 transistors should be very much similar to the other components already installed on the board.
Click to enlarge
Click to enlarge
3.6a Affix the PCB assembly in a clamp or fixture so it sits bottom side up, flat and level.
Click to enlarge
Click to enlarge
3.6b Insert a terminal pin while keeping it slightly elevated off of the PCB with your soldering iron tip between the PCB and the terminal pin's collar.
Click to enlarge
Click to enlarge
3.6c Apply solder but don't over do it and make a mess on the pin.
Click to enlarge
Click to enlarge
3.6d Gently press down on the terminal pin's collar so it seats fully in the PCB. Double check from two directions that the pin is fully perpendicular to the PCB.
Click to enlarge
Click to enlarge
3.6e Rinse and repeat for the four remaining pins. There is no circuit connection to 0V Common so that pin is not on our build.
Click to enlarge
Click to enlarge
3.6f If the proper soldering technique is used, there is absolutely no need to try and solder the terminal pins from the top. The solder will flow thru to the top very nicely by following our tips. We've never had to solder one of these pins from the top and we've built MANY!!
Click to enlarge
Click to enlarge
3.7a Clean off any flux and solder residue as required. We use MicroCare VeriClean with a toothbrush and it is simply magical!
Click to enlarge
Click to enlarge
3.7b Inspect the bottom of the PCB for solder bridges. There shalt be no solder bridges!!
 
4. Copyright Notice and Disclaimer Back to Top
The contents of this assembly guide page, including but not limited to all text, photographs and diagrams, is the intellectual property of Classic Audio Products, Inc. Reproduction or re-publication by any means whatsoever, whether electronic, mechanical or electro-mechanical, is strictly prohibited under International Copyright laws. The sole purpose for this document is to aid in the assembly of the CA-0252-DIY Rev A ~ Discrete Opamp kit offered by Classic Audio Products, Inc. Commercial use is prohibited.
Classic Audio Products, Inc. is a DIY parts / kit retailer and provides no direct support for any of the products available on this site. Support for the kits can be found at the respective [Build] thread at groupdiy.com. Any support Classic Audio Products, Inc. chooses to provide, is provided "as is" without warranty of any kind. We cannot offer any guarantee as to the consequences of the support provided. Should the support cause damage or loss of any kind, Classic Audio Products, Inc. shall not be held liable to you or any other person for indirect, special, punitive, incidental, or consequential damages or losses. While the successful build rate is extremely high, there is no guaranteed favorable outcome. Always research and plan any project you undertake thoroughly. Sometimes, a project is over your head, and it just makes more sense to hire a qualified professional.
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..156" KK Female Terminal Contact
03.DOA PCB Socket Set
04.gar2520 DOA PCB
05.Toneluck 2PDT Pushbutton Switch
06.EA2622 Input Transformer
07.C&K Black Bullet Switch Cap
08.C&K White Bullet Switch Cap
Manufacturers
Quick Find
 
Use keywords to find the product you are looking for.
Advanced Search
Specials more
VP312-Platinum Mic / Line Preamplifier
VP312-Platinum Mic / Line Preamplifier
US$699.00
US$599.00
Reviews more
HPA500 Entire Bundle
Excellent build guide, quality components. Build was a breez ..
5 of 5 Stars!

Copyright © 2024 Classic Audio Products, Inc.