Archive for June, 2018:

2018-06-28 Bootstrapped For High Z Input

From FB group Building Transistor Radios For those who don’t want to or can’t use a JFET for high input impedance, you can use a regular transistor or two and bootstrapping to get a 10 Megohm high input impedance amplifier. This is from “Common Collector Amplifiers”, Electronics Now, Oct. 1993, found at americanradiohistory.com. For RFs,

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2018-06-24 Stick But No Carrot – Spend $25 Billion to Make Jobs, Not A Wall

From FB group Orange Talk Chris Leist You misunderstood. I didn’t say give money to Mexico. I said spend it in Mexico, like spend the money to get US manufacturers to move business from Asia to south of the border. The money could not be spent here because the wages would be much higher, and

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2018-06-24 Antennas Loopstick Vs Spider Web

From FB group Building Transistor Radios Jim Glover You asked about performance. There are factors unrelated to either type that affect the performance, one being the type of wire used. If Litz wire is used it has lower losses, and therefore higher Q than solid wire. Same holds true for silver plated wire at HFs.

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2018-06-23 Chapman Ave, Santiago Canyon College

From FB group Orange Talk regarding accidents at Chapman and Jamboree I stood on the balcony of the B bldg at Santiago Canyon College and watched the traffic going right through the middle of what is now D bldg, and saw bikers on their Harleys going 50 around the right hand turn lane from Chapman

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2018-06-22 Telco Craftspeople

From FB group Bell Telephone… As a customer and the point man who interfaced with the Telco, I have nothing but good to say about all the fine craftspeople I dealt with during my 33 years with the college district. I only wish I could have spoken as highly of other contractors I had to

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2018-06-22 RJ-31X, How To And How Not To!

From FB group Bell Telephone … I agree. The upside of splitting before is that it won’t interrupt the DSL. The downside is that if there is a failure (loss of continuity or blown fuse) in the splitter, the alarm may never make a call. Most of the alarm panels we had at the college

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2018-06-21 Video Game Cartridges

From FB group James Short What the Game makers did was buy windowless 27C64 EPROMs, for example. That makes them cheaper, but you can only program them once, because they couldn’t be erased. Once they had finalized the firmware, they had it mask programmed into ROMs at the chip factory, because they could order enough

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2018-06-20 2N176 PNP Ge Power Transistor Substitutes

From FB group Building Transistor Radios Nick Cook Have you found the reason for the failure of the 2N176? You could use the NTE equivalents NTE104 or NTE121. These may be expensive but they are the substitutes. But you have to make sure that the new one doesn’t burn out. You should be able to

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2018-06-20 Don’t Ask To Share Software!

From FB group Arduino Projects Marcos Tulio Junior I think it is unethical for others to expect the coder to reveal his IP (intellectual property). There is nothing wrong with asking the coder for a link to open source software. But you are out of line when you expect others to do for you what

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2018-06-19 2N3904 Transistors Betas

From a FB group Building Transistor Radios Markku Vuorensivu Tell me more! I’m all ears! I got a thousand 2N3904 BJTs from Mouser, and ten packs of 100 from eBay. I selected a dozen from each and measured their current gain using two methods: a cheap DMM, and a ‘transistor tester’ which has the ZIF

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