4 ms·
The Kollsman Electric Tachometer Indicator
- learn_more 4y agoMagnetic coupling is clever. I always figured they used centrifugal force instead. Perhaps some do.
- systems_glitch 4y agoMost mechanical automotive speedometers use the same copper cup and magnets arrangement! Check out how they used to meter frequency: https://en.wikipedia.org/wiki/Frequency_meter#Vibrating_reed_meters https://en.wikipedia.org/wiki/Frequency_meter#Vibrating_reed...
- calvinmorrison 4y agoMay be of interest to those reading this: I asked a few weeks ago about a good oscilliscope. I purchased a $30 oscilliscope off of amazon that doesn't even have a package, it's basically on a breadboard case. and it works good enough to test things like this. I used it yesterday to test two separate signals (speedometer signal, an AC wave), and the resulting VSS output (converted to a 12v DC signal), and also for fun hooked into my tach. So... highly recommend