The construction of the new shed is progressing well.
![02.jpg](http://lh5.ggpht.com/_uT-6DNNXTO4/SXv5uem8MfI/AAAAAAAASOE/Lgx4rl97KbQ/02.jpg?imgmax=800)
Contrary to my first guess, that isn't the roof on top of the slab, it's the walls.
There was the usual bits and pieces of interesting junk to pick through.
![01.jpg](http://lh4.ggpht.com/_uT-6DNNXTO4/SXv59FH83ZI/AAAAAAAASOM/Eu88oGxTm3I/01.jpg?imgmax=800)
John has built a brilliant 3 transistor high gain audio amplifier that can drive headphones from small signals such as those from a direct conversion mixer.
![03.jpg](http://lh4.ggpht.com/_uT-6DNNXTO4/SXv6UbPrjmI/AAAAAAAASOU/IOC06B1kQW0/03.jpg?imgmax=800)
Kevin showed a helical antenna he built for a Telstra wireless broadband setup on the edge of coverage.
![04.jpg](http://lh3.ggpht.com/_uT-6DNNXTO4/SXv6Y-YAICI/AAAAAAAASOc/5aZEpDfdRYU/04.jpg?imgmax=800)
John also showed a loop antenna for 40 and 80m built in a hula hoop.
![05.jpg](http://lh6.ggpht.com/_uT-6DNNXTO4/SXv6tFP27OI/AAAAAAAASOk/sdGafwpuQ2I/05.jpg?imgmax=800)
The main presentation by Mark went through all the normally expensive or hard to obtain components that can be found for free in discarded circuit boards.
![06.jpg](http://lh6.ggpht.com/_uT-6DNNXTO4/SXv68grogTI/AAAAAAAASO8/uAdKq5hmbBc/06.jpg?imgmax=800)
Mark had lots of practical tips of getting components off boards with plumbers soldering irons, gas jets, and heat guns. It's not a subtle art.
Update
Alan, VK2ZAY has a nice writeup too.
No comments:
Post a Comment