Electronics > Projects, Designs, and Technical Stuff
Power meter for audio dummy load
Datman:
--- Quote from: nikifena on April 21, 2019, 07:40:20 pm ---They are five resistors in parallel. A total 4ohm @ 1000W :)
I will use this load mostly with amplifiers in the range of 200W so no drama with heating.
--- End quote ---
200W power on 500W or 1000W or 10000W resistors make 200W of heat!
Datman:
You could rectify the signal by a silicon diode, then calculate and show power by Arduino on a LCD.
David Hess:
--- Quote from: Datman on April 23, 2019, 02:28:54 pm ---You could rectify the signal by a silicon diode, then calculate and show power by Arduino on a LCD.
--- End quote ---
It is not *that* difficult to do the needed square function in the analog domain to directly drive a meter. A multiplier is one of the easier ways which does not require temperature compensation but it can also be done with a voltage-to-frequency converter meaning it should be possible with a 555 timer and some cleverness.
An Arduino could either directly sample the signal or sample the precision rectified version like a multimeter does and compute peak, average, and RMS. The RMS value is equal to the standard deviation.
The Electrician:
nikifena, you might find this interesting: http://www.angelfire.com/electronic/funwithtubes/Audio_Power_Meter.html
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