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A PICAXE-14M2 BASED ELECTRONIC KEYER (Ver.3.1)

 

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The BASIC Code        The Circuit Board Art Work        The Schematic        The Bill of Materials

 

I think this will be Version 3.1. It is really just a revised version of a previous keyer on this site.

Made some very minor changes to the code, new art work for a 2N7000 MOSFET and a very quiet high speed reed relay.  Also updated the schematic too.

 

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The prepared copper circuit board. I guess I could of done a better job removing some of the darker oxidation around the outside edges of the circuit board.

 

 

 

 

 

The circuit board art work is not blue. It was just bad lighting when I took the photo. The art work is 80mm x 80mm. It was printed out "after hours" on a large commercial printer/copier/fax machine at the work QTH.

 

 

 

 

 

The cheap $20 dollar laminator from the local grocery store. Pre-heat the laminator for 15 minutes prior to inserting the circuit board and art work.

 

 

 

 

 

Inserting the art work and circuit board through the laminator.

 

 

 

 

 

After peeling the glossy backing off the back of the high gloss photo paper.

 

 

 

 

 

This is the circuit board in very hot water in the laundry sink. This took about 15 minutes for the high gloss photo paper to release from the toner image and float away.

 

 

 

 

 

The only part that didn't transfer was half of an upper case letter "V" which was part of "5V". I had to touch that up with a permanent marker before etching.

 

 

 

 

 

The toner on the copper after the high gloss paper has released. The white spots I believe is just glue on top of the toner. It causes no problems and will be removed later in the process.

 

 

 

 

 

The circuit board in the Ammonium Persulphate etching solution. The solution looks like water but it is seriously corrosive!!!

 

 

 

 

 

After 10 minutes, all the unprotected copper has been removed by the Ammonium Persulphate etchant.

 

 

 

 

 

After all the holes have been drilled.

 

 

 

 

 

Top view after the holes were drilled.

 

 

 

 

 

The bottom of the circuit board after the toner has been removed with turpentine and then cleaned with alcohol. As you can see, nice circuit boards can be produced in the backyard shed.

 

 

 

 

 

A view of the bottom of the circuit board after all the parts have been soldered on the top side.

 

 

 

 

 

In the chassis with the new output devices. A very quiet reed relay and a very small 2N7000 MOSFET.

 

 

 

 

 

Front view of the PICAXE Electronic Keyer.

 

 

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