Archive for September, 2018:

2018-09-28 LM386 Used As Modulator of Final RF Output

From FB group Building Transistor Radios 2018-09-28 I see nothing wrong with using the ‘386 to directly drive the power output stage. It’s cheaper than a transformer. But I was thinking about how the current was flowing in the ‘386’s output transistors. Normally an electrolytic capacitor blocks any DC from flowing out of pin 5.

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2018-09-11 Vectronics Aircraft Radio Kit

I got the Vectronics VEC-131K aircraft band radio kit in the mail yesterday and warmed up the soldering iron to assemble it. It came at a decent price, so some of my complaints seem to be cost cutting measures. It comes with a decent assembly instruction manual, but some of the pages including the schematic

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2018-09-08 Skunk!

From FB comment to Kate Jesse’s skunk visiting her back yard, 2018-09-12 One time I was on guard duty at the Artillery Hq. in Minneapolis, standing in the 3′ by 3′ guard house at the front gate. I saw something crawling under the fence several yards away, and when I saw the white stripes, I

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2018-09-07 Q of an Inductor

from FB group Building Transistor Radios, 2018-09-07 Tom Miller Say a capacitor or inductor has a Q of 100. The losses are about 1/100 of the energy in the component. In a tuned circuit the capacitor Q is usually much higher than this – it has lower losses, so the more important is the Q

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2018-09-03 Nuclear Power Is Not Economical

from YouTube video TEDx talk comment pro nuclear power, see 2018-09-04 To paraphrase an earlier comment: “Wow! Spread the word! There is so much *left*out* with this talk!” Did you notice he left out any mention of the economic aspects of nuclear power generation? There are THREE nuclear power plants that are sitting partially built

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2018-09-02 Mims Mistakes In Audio Amplifier

From FB group Building Transistor Radios, 2018-09-02 I already see one mistake. On p.27, Audio Mixer. The R6 is only 1k. The voltage divider R5 and R6 will give a voltage less than 0.6 at Q1’s base, which means Q1 will not be forward biased enough and the circuit won’t work or else sound distorted.

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2018-09-01 Stop Plagiarizing And Be Self-sufficient

From FB group Arduino projects, 2018-09-01 Attilio Volpe This group is moderated and if you cause problems, you can be banned. But on Usenet newsgroups, where all this ‘social media’ stuff started decades ago, the groups were not moderated. If you made a mistake, you had hundreds of replies telling you to Shut the F***

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