Archive for June, 2017:

2017-06-28 Detecting Bad Alternator Rectifiers 

From comment left at a blog for a battery voltage monitor project  I think this is a great project.  But I’d like to relate to you all how it was done in the past, when alternators started replacing generators.  Back then the rectifiers were not as rugged as now, and sometimes a rectifier diode would

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2017-06-27 Pres Does Take His Salary, Donates It, Government Loses

Quote from a mailbag: “One reader took issue with our In the Works rating for Trump’s promise not to take a salary. We noted that at the White House press briefing on April 3, press secretary Sean Spicer announced that Trump would be donating his full first-quarter, pre-tax earnings of $78,333 to the National Park Service. The

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2017-06-26 Atomic  Myths, Etc .

Re: the efficiency of electric lighting systems, that’s very low. This was written before LED lights had become widespread, so I wonder what the number would be today.  Probably somewhat higher. From https://ieer.org/pubs/atomicmyths.html Also see https://ieer.org/resource/carbon-emissions/electric-future-nuclear-carb-diet/ “The average efficiency of electric lighting systems is about one percent – that is, only about one percent of the energy

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2017-06-25 Mini Audio Transformer From Goldmine Electronics 

I bought several of these miniature audio transformers  from Electronic Goldmine.  They are encapsulated so I can’t see anything, windings, core or materials.  There are 5 pins, 2 on one side and 3 on the other, but the center pin measured open, so it’s apparently there to make sure the transformer is inserted the right way. The

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2017-06-24 WWVB, Phase  Modulation and LaCrosse Clock

From FB comment to Bill Sherman’s atomic clock’s damaged LCD  At our computer club one of our members talked about this.  Over 3 years ago NIST added phase modulation to WWVB.  Only one of the makers of ‘atomic clocks’ has just come out with a clock that demodulates this phase modulation.  LaCrosse has a wall

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2017-06-23 Transistor Tester Arrived

I received the transistor tester that I ordered a week or so ago.  I ordered this one preassembled (the price was only a few dollars more) and with the plastic case, which I have to assemble.  I ordered it from a seller on eBay for $20. This is different than the component tester I bought

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2017-06-19 FM Receiver Kit  With Hex3653 Chip

I ordered these kits Several weeks ago and they finally arrived today.  I opened up the package and found several parts rattling around loose in the box.  I found one bag had been cut open, and whoever slit it didn’t tape or staple it closed. I got to work and assembled one of the kits

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2017-06-15 Capacitor Leakage Tester Ideas

I was asking about very old capacitors and their shelf life on FB vintage test equipment group.  The guys tell how good the old capacitor testers are because they have the “magic eye” to check for leakage. I was thinking that it would be easy to test any capacitor for leakage.  All that’s needed is

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2017-06-13 Another Regen Receiver Built – Success!

The previous regenerative receivers I’ve built have been 27 MHz, but they have not been successful, they haven’t received a decent verifiable signal other than the very strong one I made with a dip meter.  So this time I would build a regenerative receiver that is much lower frequency, and I chose 10.000 MHz because

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2017-06-08 AD Has ADP5090

Ever since I’ve been experimenting with Joule Thiefs I’ve done so with the intention of using the circuit for boosting a low voltage source to power a higher voltage circuit.  So I think this Analog Devices ADP5090 is very useful for doing just that: powering circuits up to 200 mW from very low voltage power

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