Archive for June, 2012:

2012-06-30 Make a Calcium Carbide Cannon

on June 30th, 2012 by - Comments Off

Long ago there were ads in the back of magazines (especially hunting and gun mags) that offered a ‘toy’ called a Bangsite Cannon (these are still available today).  What I’m describing is the way I remember it, but I don’t know if it’s the same today (it looked like the 10FC model). It’s made out

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2012-06-29 Buck 9V to 5V DC-DC Converter

I drew these in SWCAD III back in 2005.  I  haven’t built it yet.  The original used a PMOS FET,  I just wanted to put out a version that uses a much easier to get NMOS FET.

2012-06-28 Mattel Intellivision

Watson’s Mattel Intellivision from the early 1980s.

2012-06-27 Photos of LED Lights I’ve Built (Cont’d)

(Cont’d from previous blog) During the early days of my LED lights, I did some conversions of regular flashlights.  The one in the picture is a Craftsman that used four AA cells and a regular incandescent flashlight bulb.  I took the bulb out, broke the glass and removed it, and put three white LEDs, each

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2012-06-26 Photos of LED Lights I’ve Built

The LED lights I’ve built decided to have a get-together, so they met up in my kitchen.  I think they may be up to some kind of conspiracy.  I think they’re angry about not being used.  When they were made at the beginning of the millennium, they were the only LED lights available.  Well, we

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2012-06-25 Watson’s 3 Transistor Earphone Amplifier

This amplifier has been around for awhile, however the date code on the Altoids tin is “Use by 22 Aug 06″, so it had to be made sometime not long before that date or later, most likely later.  I used a high gain, low noise Japanese transistor (looks like a 2SD636) for the preamplifier, and

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2012-06-24 FET Dip Meter

Cyrodyl posted a schematic file named FET Dip Meter.PNG (you may have to be logged on and joined to the group to view this), and this is my comment about it.  I posted this comment file to the Yahoo group RegenRX2, which is the overflow from the RegenRX group, which deals with regenerative receivers. Comments

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2012-06-23 FM Wireless Mic With Timer

I wanted to listen to the morning news while I was preparing for work or whatever in the morning, but I didn’t need the full TV set in the bathroom. All I wanted was to hear the audio so I could catch the weather and a few newsworthy items.  So I built a FM transmitter

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2012-06-22 Delta AFC0912DE Fan

The fan is labeled: DC BRUSHLESS Model  AFC0912DE Dell P/N P2780 DC12V  2.50A Delta Electronics, Inc. I work with Dell PCs and I had a CPU fan laying around that came out of an older Optiplex PC.  I had connected it up to a 12V power supply much earlier, and it acted very odd. FIrst

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2012-06-21 Old Photo of Neighbor’s Ham Shack

As I’ve been moving, I have uncovered stuff that I have long forgotten and didn’t realize I had.  Here is an old stained and cracked Polaroid photo of a neighbor’s ham shack and test bench.  I’ll have to see if I can contact him and let him know that this photograph is still around.

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