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Tomi Engdahl says:
Don’t Rule Out the Neon Bulb as an AC Power-On Indicator
https://www.digikey.com/en/blog/dont-rule-out-the-neon-bulb-as-an-ac-power-on-indicator
The reality is that adding an “AC live” subcircuit using LEDs is not as easy in practice as it may appear “on paper.”
Go back to the future with neon lamps
Fortunately, there is a time-tested and highly reliable solution: use a small neon bulb and a current-limiting resistor (Figure 3) which can be connected directly to the AC line (120 or 240 volts AC (VAC)). While this circuit must also be properly insulated, it’s so simple and small that it can be covered in heat shrink tubing or similarly insulated.
Neon bulbs – more properly called lamps since that is their function – have been around since the early 1900s and come in a variety of sizes and styles. The most common size in general use for indicators by far is generically known as the NE-2 lamp. A good example is the Interlight 4PAK:WX-EGA2-0. It measures 12 millimeters (mm) long and 5 mm in diameter (Figure 4).
Tomi Engdahl says:
There are many cases where an old technology can still be a legitimate or even the best solution to modern design challenges. While LED indicators have largely obsoleted neon for low-voltage solutions, neon lamps are still a very simple and viable option for AC-line indication.
Tomi says:
https://etn.fi/index.php/tekniset-artikkelit/15725-piikarbidi-vaatii-paljon-ohjaukselta
Tomi Engdahl says:
https://article.murata.com/en-us/article/basics-of-noise-countermeasures-lesson-12?fbclid=IwAR0JSG2skAFnM0Z5PzMbCvLFdqgJz8G7yLvMTvV1tm1eCpSVt0edd7En1OM
Tomi Engdahl says:
https://www.gadgetronicx.com/bfo-metal-detector/
Tomi Engdahl says:
https://philipmcgaw.com/capacitors/
Tomi Engdahl says:
https://www.macrofab.com/blog/improve-heat-dissipation-compact-pcba-designs/
Tomi Engdahl says:
https://www.edn.com/power-an-led-driver-using-off-the-shelf-components/
Tomi Engdahl says:
https://bluemoonshine.fun/Project-AudioSpectrumAnalyzer.php?fbclid=IwAR3nqAtVBj9Er2F-btJMFnI4IE7t9hHml6RypqKxljO0wnslV5UyYZMX4ww
Tomi Engdahl says:
RF Current Measurements Made Easy: An Oscilloscope Current Probe for RF
https://www.elektormagazine.com/articles/oscilloscope-current-probe-for-rf-1?fbclid=IwAR0rjLS9n7hGXM5ee3RSHHyotX50P4NlSzQpRmybueYwXJ1dRJwopmKLU2c
Tomi Engdahl says:
https://www.cui.com/blog/insulation-isolation-and-working-voltage
Tomi Engdahl says:
https://hackaday.io/project/194774-opamp-building-blocks
Tomi Engdahl says:
https://hackaday.com/2024/02/23/op-amp-drag-race-turns-out-poorly-for-741/
Tomi Engdahl says:
https://hackaday.com/2024/03/12/design-review-dpi-lvds-sony-vaio-lcd-devboard/