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  • Author Author: baldengineer
  • Date Created: 25 Jan 2023 5:55 PM Date Created
  • Views 1862 views
  • Likes 15 likes
  • Comments 5 comments
  • kicad
  • op amp
  • pcb
Related
Recommended

Op Amp Proto Board (SOIC-8)

baldengineer
baldengineer
25 Jan 2023
Solderable Protoboard Examples

In the Slew Rate vs Rise Time video, I used this little breakout board. The bottom side is a continuous copper plane. On the top, the square pins have solder pads that you can connect to the top and bottom copper pour. The idea is to provide as much ground as possible.

There are a few 2.54mm spaced holes for each pin. These allow for through-hole passives or 0805 surface mounts.

The headers on the "top" and "bottom" of the board are connected to each other and intended for power rails.

Originally, I designed the board for SOIC-8. I didn't think of DIP compatibility. So on version 1, you can get a DIP-8 to fit, but you have to bend the pins a bit. 

image

Last, the PCB fab I used can, apparently, print silk directly on HASL. I assumed they wouldn't, so I didn't remove any of the top-layer silk. Oops. In the microscope shot below, you can see white silk screen around the "solder jumper" footprint pads. The silk does help contain the solder when shorting them, so that was nice.

microscope of silk on copper

Anyway, I found the board worked well, especially compared to a breadboard.

$32 for qty 5 shipped from an Asia-based PCB house.

Design Files

Download the KiCad design files here.

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  • wolfgangfriedrich
    wolfgangfriedrich over 3 years ago

    From the top the board looks almost home etched (minus the silkscreen) or from good old Alberta Printed Circuits.

    But what layer are the big pale rectangles? Oh, maybe bottom layer silkscreen...

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  • wolfgangfriedrich
    wolfgangfriedrich over 3 years ago

    From the top the board looks almost home etched (minus the silkscreen) or from good old Alberta Printed Circuits.

    But what layer are the big pale rectangles? Oh, maybe bottom layer silkscreen...

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  • baldengineer
    baldengineer over 3 years ago in reply to wolfgangfriedrich

    Oh, big pale rectangles are blocks of silk screen on the bottom. They were meant to give me a place to label the circuits.

    The original plan was to compare multiple op amps. But, then I got side-tracked along the way.

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