7
votes
How can I measure the speed of sound with an oscilloscope and ultrasonic sensor? (Currently getting low value.)
Your approach is not taking into account the very narrow bandwidth of the transducers. @jsotola's point is that it takes some time for the oscillations to build up in the transmitter, and a similar ...
- 176k
5
votes
How can I measure the speed of sound with an oscilloscope and ultrasonic sensor? (Currently getting low value.)
how to measure the speed of sound with oscilloscope and ultrasonic
sensor? (Currently getting low value)
Time is required for these narrow-bandwidth transducers to build amplitude to full - both ...
- 26.9k
3
votes
How to test and control this gauge pointer? (multimeter movement?)
This is called an "air core" meter movement. The X and Y coils (there is 90° between them) are driven by quadrature currents (proportional to \$\sin{\theta}\$ and \$\cos{\theta}\$) in order ...
2
votes
How to test and control this gauge pointer? (multimeter movement?)
These meters are not like a d'Arsonval meter movement which has a coil moving in the field of a fixed magnet, they have a magnet or piece of iron moving in the magnetic fields of two coils, a control ...
- 26k
1
vote
Problem measuring car radio audio output with an oscilloscope
The output likely is from a bridge amplifier, which is not referenced to ground.
Since most automotive systems are 12 VDC, and loudspeakers are commonly 4 or 8 Ω, maximum power would be limited to 36 ...
- 4,967
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