The used a cassette recorder to store the photo and play it back. https://spectrum.ieee.org/first-digital-camera-history?fbclid=IwdGRzaAPVVKFjbGNrA9VS7mV4dG4DYWVtAjExAHNydGMGYXBwX2lkDDM1MDY4NTUzMTcyOAABHmbAC3KQ45zuuvHG-fgR6vTCncLee1hqvshLQ0ImklaCVZqVRjvVEz2FdmeY_aem_eXezm2tGP2Rnsz_HIO7IEQ
Archive for the ‘Electronic Design’ Category:
2025-11-20 Designing A Super Simple Voltage Indicator Based On Battery Charge Indicator
I’ve considered how to turn a power on indicator LED into an output voltage indicator for an adjustable power supply. All the user would see is the indicator LED. This LED would be full brightness when the PS is on, except when it is indicating the voltage, which is when the LED will dim. The
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2025-10-06 Schematic Of On-Off Touch Switch, Latching
This circuit uses four BJTs – 3 NPN and 1 PNP high current to drive the load. It has two touch pads, one for On and one for Off. I don’t see any information about the power supply voltage or load current. Some maximum voltage and current should be given for the circuit as shown.
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2025-08-10 Night Light Wastes Power Shunting Current From LEDs
This is the comment I left in Big Clive’s channel video. “I think this shunting current away from the LEDs is deceptive and fraudulent. They should be required to tell this in the instructions. In the US there are regulations governing vampire devices such as the AC adapters and their efficiency levels. Since they’re on
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2025-07-08 In 1929 The Superheterodyne Radios Made TRF Radios Obsolete
In the 1920s the TRF – tuned radio frequency – radios were hard to tune and their performance wasn’t very good. In 1929 the radio manufacturers started selling superheterodyne radios that had only one tuning knob, not several like the TRFs had. No more fiddling around with knobs to try to get good reception. Plus
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2025-06-25 Drone Can Charge Straight From The Power Line
This drone can charge straight from the power lines. A prototype built by students in Denmark. https://www.facebook.com/reel/2827561450966396/?mibextid=9drbnH
2025-05-13 How To Understand Any Electronic Circuit
Book Learn to Build Electronics Projects https://www.facebook.com/100064561517360/posts/pfbid02qmmukKwJbxWMs6HVLU11zNM5xfxdCX7nczjZdejgjrdGzsVs4RV8A7mNNgbTmJnAl/?mibextid=9drbnH&s=yWDuG2&fs=e
2024-12-05 Voyager’s Computers Run On 70 Kilobytes Of Plated Wire Memory
An interesting video about NASA’s Voyager spacecraft computers. https://www.facebook.com/ThePrimalSpace/videos/1223112522301454/?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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