Electronics Design

Is 4kHz too high a beeper frequency?

I'm finishing a design for a small instrument that will be used by people of all ages, mostly in the health-care indust...

96 comments posted 6yrs

posted by winfieldhill

96 comments posted 6yrs posted by winfieldhill

Is 3 Watts really too much to ask?

Gentlemen, in pursuance of what is turning out to be a jinxed project (installing a dashcam) I'm attempting to drop 14....

51 comments posted 6yrs

posted by cd

51 comments posted 6yrs posted by cd

Device Produces Ionic Wind To Create Virus Free Safe Space

"When social distancing isn't an option." They quote a bunch of summaries about health effects of contaminated air from...

18 comments posted 6yrs

posted by bloggs.fredbloggs.fred

18 comments posted 6yrs posted by bloggs.fredbloggs.fred

OT: And So It Begins....

This is going to cost.... https://www.express.co.uk/news/world/1271028/Angela-Merkel-Germany-China-coronavirus-blame-Wuh...

7 comments posted 6yrs

posted by cd

7 comments posted 6yrs posted by cd

Snubber needed for triac driving heating element?

This is about a triac switching a heater on and off. The heating element is mostly resistive with a small incidental in...

28 comments posted 6yrs

posted by nobody

28 comments posted 6yrs posted by nobody

It's not just lungs: Covid-19 may damage the heart, brain, and kidneys

And they're talking about serious damage which leaves people in an advanced state of disrepair, so to speak, sometimes...

4 comments posted 6yrs

posted by bloggs.fredbloggs.fred

4 comments posted 6yrs posted by bloggs.fredbloggs.fred

Soldering to glass

I have recently conducted some research on binding SMD components with glass and ceramic substrates using pure indium a...

22 comments posted 6yrs

posted by peter.pan

22 comments posted 6yrs posted by peter.pan

Heatsing for TO263

Hi, does this make much sense? http://smartheatsinks.com/SHS_SMT.pdf The heat path between the transistor and the heatsi...

7 comments posted 6yrs

posted by peter.pan

7 comments posted 6yrs posted by peter.pan

Italian engineering

Hose clamp mounted with the screw-side rubbing up against the fuel line both of which are running next to the exhaust ma...

14 comments posted 6yrs

posted by user

14 comments posted 6yrs posted by user

Anyone feel the Planet Cooling?

Hi, with aviation at a near standstill, vastly reduced road traffic, retail businesses & whole industries in hibernatio...

27 comments posted 6yrs

posted by pallison49

27 comments posted 6yrs posted by pallison49

Hef's oscilloscope!

What is that thing? (Built into the wall) Early Tek? I can't peel my eyes off it. Darned bouncing 1968 women, Godda Inn...

5 comments posted 6yrs

posted by billb

5 comments posted 6yrs posted by billb

Need connections help from diagrams

I'm trying to assemble a project and somehow I suppose I'm failing miserabl y at connections as it doesn't work. I'd li...

58 comments posted 6yrs

posted by medusa569

58 comments posted 6yrs posted by medusa569

ACM3P 3-Phase AC Ammeters

Can a Murata / Datel ACM3P 3-Phase AC Ammeter, complete with three current transformers, for $72, be used with, e.g., a...

23 comments posted 6yrs

posted by winfieldhill

23 comments posted 6yrs posted by winfieldhill

Anciliary caps for voltage regs

Gentlemen, As a mere hobbyist, every time I need to use a 5V or 12V fixed voltage regulator such as the L78 series in T...

8 comments posted 6yrs

posted by cd

8 comments posted 6yrs posted by cd

spark gap fun

https://www.youtube.com/watch?v=SnKKj2bonAI&feature=youtu.be&t=63 https://www.youtube.com/watch?v=SnKKj2bonAI&feature=yo...

3 comments posted 6yrs

posted by fizzbintuesday

3 comments posted 6yrs posted by fizzbintuesday