I get these photos of tape recorders, mostly reel-to-reel, in my Facebook feed. But this second one uses the turntable of a record player as the capstan to pull the tape across the head. It’s likely that this is playback only – I see no erase head. https://www.facebook.com/reel/1111971103851208/?mibextid=9drbnH&s=yWDuG2&fs=e
Archive for the ‘Audio’ Category:
2025-09-12 How The Dr. Who Theme Was Synthesized
A quick demonstration of how the theme was synthesized on an Arp synthesizer. https://www.facebook.com/reel/750017644469519/?mibextid=9drbnH&s=yWDuG2&fs=e
2025-09-11 Inventor Performs Synthesized Music On The Ondioline
Steve Allen hosts the ?Tonight Show? a long, long time ago, back in the black and white days of TV. I’m guessing the early 1960s. https://www.facebook.com/reel/758211690309657/?mibextid=9drbnH&s=yWDuG2&fs=e
2025-08-16 The Thwaites Ice Shelf Is Melting Faster
“”The Thwaites Glacier in Antarctica, often called the “Doomsday Glacier,” is one of the most fragile ice formations on Earth. Covering an area roughly the size of Florida, it contains enough ice to raise global sea levels by over two feet if it completely melts. Its collapse could also destabilize neighboring glaciers, potentially causing sea
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2025-07-24 Gyrotron, 1 MW, Thales TH1507 For Stellarator
https://ieeexplore.ieee.org/document/8874589 Matt Undecided showed a photo of it.
2025-07-10 HX-6B AM Radio Kit Assembly
Details on assembling this AM radio kit that’s mostly in Chinese. Note that “http:” is not secure so it might need https: instead. http://www.radioboatanchorblog.com/blog/hx-6b-chinese-radio-kit-build?fbclid=IwY2xjawLcfHdleHRuA2FlbQIxMQABHkIPEJW7iGvqm7ooztFySxe38gLI2guH4ymbV-sXwPbOoqyIxvYFQxL0J5j4_aem_Msqfjb36T0JDEY92jt3izQ
2025-02-01 Morse Code Text Encoder, Translator, Converts Into Audio File.
https://morsecode.world/international/translator.html
2024-12-15 Hot Arcs From Flyback Transformers Play “Take On Me” by Ah-hah
Hot Arcs From Flyback Transformers Play “Take On Me” by Ah-hah. The flybacks are driven by a power amp made for driving these flyback transformers. Looks like just a few turns of 18 AWG wire are wrapped around the bare ferrite cores. A highly effective plasma speaker, better sounding than a Tesla coil. https://www.facebook.com/franzolielectronics/videos/272985324667136/?mibextid=9drbnH&s=yWDuG2&fs=e
2024-11-08 RF Amp Using BD139 Power Transistors
He has a strong Aussie accent, a bit hard to understand. It’s a 28 min. YouTube video. He says BD139s have a fT of 250 MHz, but the datasheet I have does not specify any fT because the D in BD139 means they are a low frequency device, not meant for VHFs or RFs in
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2024-10-08 Transistor History – Raytheon, CK722, etc.
Long article https://sites.google.com/site/transistorhistory/Home/us-semiconductor-manufacturers/raytheon-part-one-2 A comprehensive history of the Raytheon corporation. Also information about other companies.
