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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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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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.
I started thinking about how the makers of transistors sort the different grades of transistors as they’re manufactured. I thought that a reasonable analogy would be similar to how a farmer might sort the fruit he harvests. Here’s what I came up with.The farmer starts with the fruit his workers have gathered. The fruit is
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I posted this a few days ago.https://m.facebook.com/groups/606087512820068?view=permalink&id=2638214152940717 Now I’ve replaced the capacitors in another one very similar, a DE LUXE. It’s not quite as complete and in as good a shape as the Encore. What surprised me was that some of the electrolytic capacitors were bad (measured open) and the symptom was no sound whatsoever
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From FB group Vintage Transistor Radios I rehabilitated this Plata 7 transistor AM radio made by Shirasuna Denki in Japan. I replaced the electrolytic capacitors, and I found that one of the germanium output transistors was shorted. I replaced both with silicon PNP transistors (the screwdriver tip on the right points to the two). Above
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Merry Christmas… From FB … Dec 24 I found the video I watched and built the circuit a while ago. This is a PSO, phase shift oscillator. If you look at the wiki for a PSO you will see that it typically has three CR elements to shift the phase (the last is a combination
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from FB group Building Transistor Radios 2018-11-30 I’ve done some experimenting on volume controls that are badly worn and noisy. The idea is to substitute some resistance for the badly worn spot. The loud crackling will be reduced and the normal volume point will be moved to a higher point on the control. For a
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from FB group Building Transistor Radios 2018-11-26 https://archive.org/stream/ETIA1983/ETI%25201983-03%2520March_djvu.txt Two 6 uH RF chokes The photo shows two different RF chokes, each about 6.4 microhenrys. The one on the left is a ferrite bead, made by Fair-Rite, Cat. # 2643000801. These were about 12 cents apiece from Mouser.com. Yes, the wire passes through the small hole
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From FB group Building Transistor Radios Larry Daniel 2018-11-26 This is the original schematic posted by Larry. GM is a gimmick capacitor made of two short lengths of solid hookup wire, twisted together for a few pF capacitance. List of RF Chokes for the ham bands Larry said he used an RCA SK1008, then corrected
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