Some imperfections in the boards needed to be fixed before the board could be completed. Two boards were etched to ensure that at least one usable board could be made. Pads for the transistors were touching one another so a blade had to be used to carve out the copper between them. On the other board, this was not necessary since the error was caught in time and it was a simple matter of cutting the toner to create the gap.
There was one obvious break in a trace. It was repaired by soldering a short length of wire over both sides of the break. This was originally noticed as an imperfection in the toner print and Sharpie marker was applied on top of the toner but it may have spent too much time in the hydrochloric/hydrogen peroxide bath.
A drill press was clamped to a table for a workstation. Small metric drill bits were selected. Water was used to keep dust minimized. Each pad on the circuit board had to be drilled according to the size of the hole in the copper.
Drilling went well. Three differently sized bits were used to create all the necessary holes. The transistor pads, which is where most of the problems were, had the smallest and closest holes so they presented the most trouble. One transistor footprint had the misfortune of all the holes joining into one long hole. This will present difficulties when soldering components.
Downloads:
The rest of the posts for this project have been arranged by date
First time here?
Completed projects from year 1
Completed projects from year 2
Completed projects from year 3
Disclaimer for http://24hourengineer.blogspot.com/ and 24hourengineer.com
This disclaimer must be intact and whole. This disclaimer must be included if a project is distributed.
All information in this blog, or linked by this blog, are not to be taken as advice or solicitation. Anyone attempting to replicate, in whole or in part, is responsible for the outcome and procedure. Any loss of functionality, money, property or similar, is the responsibility of those involved in the replication.
All digital communication regarding the email address 24hourengineer@gmail.com becomes the intellectual property of Brian McEvoy. Any information contained within these messages may be distributed or retained at the discretion of Brian McEvoy. Any email sent to this address, or any email account owned by Brian McEvoy, cannot be used to claim property or assets.
Comments to the blog may be utilized or erased at the discretion of the owner. No one posting may claim property or assets based on a post.
This blog, including pictures and text, is copyright to Brian McEvoy.
2017-05-10 (W)
Separated copper pads
There was one obvious break in a trace. It was repaired by soldering a short length of wire over both sides of the break. This was originally noticed as an imperfection in the toner print and Sharpie marker was applied on top of the toner but it may have spent too much time in the hydrochloric/hydrogen peroxide bath.
Repaired trace
A drill press was clamped to a table for a workstation. Small metric drill bits were selected. Water was used to keep dust minimized. Each pad on the circuit board had to be drilled according to the size of the hole in the copper.
Drill press and circuit boards
Drilling went well. Three differently sized bits were used to create all the necessary holes. The transistor pads, which is where most of the problems were, had the smallest and closest holes so they presented the most trouble. One transistor footprint had the misfortune of all the holes joining into one long hole. This will present difficulties when soldering components.
Drill circuit board
Downloads:
- Arduino firmware
- OpenSCAD code
- STL printable models
- STL printable pipe dividers
- Python Last-Man-Standing program
- Easy EDA
The rest of the posts for this project have been arranged by date
First time here?
Completed projects from year 1
Completed projects from year 2
Completed projects from year 3
Disclaimer for http://24hourengineer.blogspot.com/ and 24hourengineer.com
This disclaimer must be intact and whole. This disclaimer must be included if a project is distributed.
All information in this blog, or linked by this blog, are not to be taken as advice or solicitation. Anyone attempting to replicate, in whole or in part, is responsible for the outcome and procedure. Any loss of functionality, money, property or similar, is the responsibility of those involved in the replication.
All digital communication regarding the email address 24hourengineer@gmail.com becomes the intellectual property of Brian McEvoy. Any information contained within these messages may be distributed or retained at the discretion of Brian McEvoy. Any email sent to this address, or any email account owned by Brian McEvoy, cannot be used to claim property or assets.
Comments to the blog may be utilized or erased at the discretion of the owner. No one posting may claim property or assets based on a post.
This blog, including pictures and text, is copyright to Brian McEvoy.
2017-05-10 (W)
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