Archive for August, 2018:

2018-08-31 An Old Software Saying

From FB group Bell Telephone… 2018-08-31 Gary Stoutenburg I love that comparison. 👍 There’s an old IT adage: “The first 90% of the software takes 10% of the time. The last 10% of the software takes 90% of the time.” The user interface is a big time and money sink, so a lot of corner

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2018-08-30 Using Radio Signal To Power A Receiver

From FB group Building Transistor Radios 2018-09-01 There are too many ‘gotchas.’ You have to put up a large sized antenna to gather enough power to run the circuit. That means you cannot use this in a city where the properties are too small, due to lack of space. You go to the country where

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From FB group Building Transistor Radios 2018-08-27 Michael Kronsteiner I would say that germanium transistors could not handle “high” currents because the designers were unwilling to use anything more than the cheapest germanium transistors that could barely do the job. In the 1960s there was the Workman “99 Power” that was in the TO-3 diamond

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2018-08-24 2N3904 & 2N3906 for Output Transistors

From FB group Building Transistor Radios 2018-08-24 – The discussion was about the OTL complementary symmetry audio amplifier that Mr. Barnett has posted several times to the group, which uses a 2N3904 and 2N3906. Willie Barnett Let’s talk about current. Suppose your amp has a 9V supply. When the output transistor is turned fully on,

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2018-08-22 “Crooked Donald” Trump


Quoted from end of this article “Whatever legal and political consequences ensue, Trump voters should know that they cast their ballot for a man who has lied to them all along, even about a felony that would help him win the 2016 election. A nickname that pithily distilled his behavior would be “Crooked Donald.”

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2018-08-20 2N3904s From Mouser And Ebay

from FB group Building Transistor Radios 2018-08-22 Olek Kopyto I recently did some tests on 2N3904s I got from Mouser and from a Chinese eBay seller. The ones from Mouser had a current gain of right around 200, right in the middle of the 100 to 300 gain range according to the data sheet. The

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2018-08-18 Two Types Of Germaniums In Old Radios

From FB group Vintage Transistor Radios There are really only two types of germanium transistors in older radios. One is for the RF and IF stages and has low collector to base capacitance. The other is audio and can handle a few hundred milliwatts. I recently replaced the germanium audio transistors with silicon, with change

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2018-08-16 Cancer Loves Fat Cells

Sci Am article

2018-08-03 GE Special Speaker And Iron Particles

From FB group Building Transistor Radios, Aug 6 This also happens with the meter movements of old analog meters. The iron particles get into the magnet assembly and stop the coil from moving. The only way I’ve found that gets rid of the iron particles is to very gently put a thin piece of steel

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2018-08-01 Almost Electrocuted by HV

From FB group Bell Telephone… Aug 1 We got to move into our new computer center bldg in ’96, and the old bldg was being demolished. Two guys were jack hammering in a ditch when I drove by going to another site. When I came back later, they were gone but all the equipment was

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