This is a long article but a very interesting project. It uses HSMS-2850 Schottky detector diodes in a discriminator. He uses WE 1200 ohm sound powered headphones. He’s Canadian. https://electronbunker.ca/eb/FMCrystalSet.html
Archive for the ‘Diodes’ Category:
2024-03-26 HVDC Module Teardown, Operation And Explanation
A 41 min. YouTube video shows operation, tears down, and explains the components. It seems that they are made with cheap chinesium components that are too low voltage ratings so they will fail prematurely if the HVDC is left on a long time or if the spark gap is too wide. Schematic from video is
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2024-03-08 FWBR Ripple Calculator Online
This may be helpful when choosing the amount of capacitance for a certain unregulated AC power supply – the kind that uses an old fashioned transformer. It calculates one variable given the others. https://www.chipbuilder.com/full-wave-power-supply-ripple-calculator.html
2024-02-11 Calculations: Ferrite Loopstick for a Crystal Set
I think this came from a crystal set made in Japan during the mid-20th century. It has a ball on the end of the ferrite rod like the crystal sets that were shaped like a rocket and this ball was at the rocket’s nose. The coil measures 38 to 380 microhenrys depending on the position
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2023-10-19 Telephone Receiver Click Suppressor Varistor
I posted the photo of the back side of the receiver (earpiece) for a Bell System telephone (either 500 or 2500) set. I said that the green blob in my photo (and the ’44A’ metal can in the wikimedia photo below) was used for reducing the volume of loud signals. Well, that’s only slightly correct.
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2021-05-11 Power Supply Protection Diodes
First off, *all* power supplies should have what this one has. A high current diode across the output jacks, cathode or banded end to positive. This is to protect the output from reverse voltage. A high current diode across the 2N3055 pass transistor, cathode or banded end towards the collector. This protects the transistor from
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2021-02-25 Set Blows Out Substitute Diodes
From FB group I take … Alejandro Cruz He said a diode is a diode but there are more than volts and current. The reverse recovery time is important. If it is rectifying 50 or 60 Hz AC then standard recovery time is good. If it’s rectifying high frequencies then it should be fast recovery
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2020-02-08 60 LED Solar Lights Stopped Working – Dead Diode!
From FB group electronics hobbyists Over the holidays I installed two solar 60 LED lights I bought on eBay. They stopped working just a few weeks after. I finally got up on the ladder and took them down to see why they died. Well, spit! The solar panel is plugged into the jack on the
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2020-01-10 Corrosion and Damage On Diode Leads
This photo is a detector diode that was broken during replacing the electrolytic capacitors. The lead on the top was twisted, apparently putting stress on the glass package. I replaced it with a 1N270 germanium diode. comment from fb group Vintage Transistor Radios Did you notice that the leads are magnetic? They stick to the
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2015-04-29 Humongous Rectifier Diode
I ordered a half dozen of these huge, high current rectifiers from Goldmine for use as paper weights. That’s about all they can be used for until I find some specs or a data sheet for them. The metal base is 3 inches or 76 mm square. I have seen rectifiers much smaller than this
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