Archive for January, 2020:

2020-01-30 Royal 200 Silicon Conversion, Part 3

Also to FB group Vintage Transistor Radios I finally drew the line and said I’m finished fiddling with this Zenith Royal 200 and put it back together. I got it without knobs or handle, and with all the transistors missing. It’s not pretty, and the speaker cone is warped and sounds bad. This is the

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2020-01-29 Fusion Thoughts About The Future, Pros, Cons

So many ideas about the future promises of nuclear fusion power, how it will affect the world. Will nuclear fusion ever become a reality? It remains to be seen. In the meantime we will have to make do with renewable energy, mostly wind and solar. The goal is to greatly reduce use of fossil fuels

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2020-01-28 Hacking Absurdly Lucrative

A good Politifact article re: SEO hacking and trying to track down a fake news author/exploiter. “It’s absurdly lucrative, almost like printing money,” said David Carroll, an associate professor of media design at the New School’s Parsons School of Design. “Facebook targeting makes it so easy to buy access to audiences that engage with

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2020-01-24 Soldering Surface Mount Devices

From FB group Vintage Transistor Radios Gary Maker For decades I was intimidated by SMDs, never touched them. A few years ago I bought a LED chaser kit and a SMD soldering practice kit, and I got a cheap 8 watt soldering iron that plugs into a USB charger. It has a small pointed tip.

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2020-01-23 DIY Variable Capacitor 90 to 3400 pF

The beginning isn’t clear about how it looks. First, scroll to end and look at the photo.

2020-01-22 I was Zucked by a Facebook Group Administrator

Jeff Collins There are too many admins who have no consideration for members and give no warning to members that they violated some capricious rule that the admin arbitrarily made up. I was banned without warning from an Arduino group for something that wasn’t my fault. The admin decided I had to apologize for blocking

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2020-01-21 Powering AC Adapters From 48 VDC or ??

I have thought about how to convert low voltage DC solar power for use inside the home. If the solar PV panels put out 24 or 48 VDC to a storage battery, the usual battery system is followed by a DC to AC inverter that puts out standard electric power, 120VAC in the USA. But

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2020-01-20 Costs of Radio Assemblies and Parts

From FB group Vintage Transistor Radios A thought occured. Do you think that Motorola may have had a lot of parts for tube sets and they decided to use them up by putting a transistor chassis in them? If you break down a radio into its assemblies and/or parts, which of them has the highest

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2020-01-18 More Zenith Royal 200 Conversion to Silicon

Continued from post 2020-01-15 I dug through my drawers and boxes of transistors and found a bunch of MPSA56 PNP general purpose on tape, and put them into the LO and mixer. I think they helped slightly – they are lower minimum fT than the 2N3906s. I adjusted – optimized – the trimpots I had

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2020-01-16 How To Remove Battery Corrosion

I took a battery holder that was corroded by leaking alkaline cells and I put it in a cup of vinegar. After several hours it came out clean, and I washed it off and let it dry. It looks pretty good now.

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