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Electronics Experiments

with small computers,
The picture is of a 1930s Wireless World Quality Amplifier.
 


The uniselector clock -  unique?



If you'd like to comment on anything you see here please feel free to leave a note on my blog -  Michael Saunby.

Nokia Internet Tablets

Nokia N800 (top right) and N810 (bottom right) emulating the older devices to the left of the picture.
I've ported a few applications I find useful to these tablets - and the earlier 770.



Texas Instruments MSP430

 At present I'm still finding my way with this device.  In the photo you can see three TI EZ430-T2012 boards bought from Farnell.  These boards make experimenting very easy, you just plug them in to the EZ430-F2013 USB programmer, and once programmed can run stand alone from a 3V lithium watch battery.  As supplied the boards have 14 plated holes at 0.1" pitch.  For hardware prototyping I soldered on some "header" pins from an old PC motherboard - the battery holder, cable and the small 32kHz watch crystal came from the same source.  The inspiration for this was Sivan Toledo's I2C interfaced IR remote - here.  This arrangement works fine, but I then found some 0.1" pitch IC socket strips  and  decided  that for my purposes they would be easier to work with - thin solid wire will push in, so no bulky cable required.


Digital Radio Mondiale (DRM)

This looks like an interesting use for vintage tuners and receivers such as the Sound Sales DX Plus One.

I'll need to convert the signal to a 12kHz IF.  Here's a circuit using a FET - how modern!  I think I'll stick to a good old triode-hexode.

There are sample files here http://www.g7ltt.com/drm/
and using one of these I was able to check that my install (on Ubuntu) of Dream DRM Receiver was working.