Thursday, December 05, 2024

MeSQUAREs alternative - 1/32" board

MeSQUAREs are excellent. I've purchased them from QRPme in the past and used them with great success. I get through them very quickly and find it a bit unfortunate that the postage costs more than the product. 

I've been looking at ways to do copper board prototyping in various ways including recently cutting circular pads.

Cutting copper board is difficult. It can be done with a hacksaw or Dremel but it's a tedious process and it's very hard to make small bits of board. The obvious answer is to use "tin snips" to cut the board but I find it splinters badly. 

Recently I discovered 1/32 inch copper board. Kevin, VK2KB, kindly sent me a few boards and I ordered some via eBay. It seems to be used for some sort of craft activity. It cuts quite easily:


I've been able to quickly manufacture a collection of useful little squares:


As an experiment, I've built a simple, one way, 10dB gain, Termination Insensitive Amplifier as described by Wes Hayward, W7ZOI, and Bob Kopski, K3NHI:


It works nicely! The copper does curl a bit when cut but I found it can be superglued down quite easily. I used a weight on the long power rail shown above.

Here's how I hold components while soldering the first lead:


My second attempt at a TIA is much more compact:


TIAs are very useful and I thought it might be nice to get some PCBs for them. I have bought from MostlyDIYRF in the past but the shipping US->Australia is extravagant. Looking around I found that Craig Weston has done a PCB design in KiCAD and generously shared it here.

3 comments:

  1. I'm a tin shears guy myself Peter. I have become a bit particular about the underlying stock on the copper clad boards. Some of this stuff is flaky glassy -- I stay away from that. I like being able -- with the tin shears -- to make any size pad I want. The super glue is fine. People claim that it is not permanent enough. But I disagree. My Tia boards look much like yours. Tin Shears Forever! 73 Bill

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  2. I find that method of construction interesting, but have never tried it. However, while looking at Aliexpress the other day I found a listing for 100 x 6.5*7mm PCB squares for $1.57 with the Choice free shipping for orders over $10. Search for "100pcs FR4 PCB" or see this one https://www.aliexpress.com/item/32954487029.html

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  3. Gary, that's brilliant. I have ordered some and will report back. Thank you!

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