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RMS (Root Mean Square) Circuits
 

Last Updated: October 09, 2017 03:39 PM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

10 Watt RMS Amplifier -  A Very Simple 12.5 Watt RMS Power Amplifier, into an 8 ohm load and with the op-amp driver.  This was the Maximum output before Clipping on the Oscilloscope, using an 8 Ohm Resistive load.   __ Designed by G.L. Chemelec

100W RMS/Channel Stereo Amplifier-Part 3 -  Final article covers the assembly of the remaining modules and includes the full wiring and setting up details.__ SiliconChip

A 10 Watt RMS Amplifier -  A Very Simple 12.5 Watt RMS Power Amplifier, into an 8 ohm load and with the op-amp driver.  This was the Maximum output before Clipping on the Oscilloscope, using an 8 Ohm Resistive load.   __ Designed by G.L. Chemelec

A Monolithic IC for 100MHz RMS-DC Conversion -  Linear Technology AN22 __ Designed by Jim Williams - Sep 1st, 1987

A Nominal 10 Watt Power Amplifier -  A Very Simple 12.5 Watt RMS Power Amplifier, into an 8 ohm load and with the op-amp driver.  This was the Maximum output before Clipping on the Oscilloscope, using an 8 Ohm Resistive load.   __ Designed by G.L. Chemelec

An Autoranging True RMS Converter -  DN339 Design Notes__ Linear Technology/Analog Devices

AN106 - Instrumentation Circuitry Using RMS-to-DC Converters -  Linear Technology AN106 __ Designed by Jim Williams - Feb 21st, 2007

AN22 - A Monolithic IC for 100MHz RMS-DC Conversion -  Linear Technology AN22 __ Designed by Jim Williams - Sep 1st, 1987

Autoranging True RMS-to-DC Converter -  A programmable gain amplifier (LTC6910-2) and a window comparator (LTC6700-1) and some control logic creates a wide dynamic range RMS to DC converter.  The comparator monitors the DC output and signals whether to increment or decrement the gain to maintain a predetermined output voltage range.  Knowing the output DC voltage and the gain setting can determine the True RMS amplitude of the signal being monitored__ Linear Technology/Analog Devices App Note, Mar 16, 2010

Circuit measures true-rms & average value -  09/26/02 EDN Design Ideas:  The circuit in Figure 1 measures both the true-rms value and the rectified average value of an ac signal.  This design uses two low-cost ICs  in SOIC  packages and consumes only 180 A of quiescent current.  Operating from a single 5V supply, the circuit has an input dynamic range of less than 30 mV to greater than 3V rms __ Circuit Design by Charles Kitchin and Lew Counts, Analog Devices, Wilmington, MA

Circuit's RMS output is linearly proportional to temperature over wide range -  it is known that the p-n diode can be the basis of an accurate thermometer for cryogenic temperatures up to about 200C.  A constant current is maintained through the diode and the voltage across it gives an indication of the temperature.  The magnitude of the constant current is typically chosen small to minimize diode self heating.  The diode voltage falls linearly with temperature making it necessary to have an operational amplifier conditioning circuit for direct readout.  Output calibration is achieved using a voltage reference.    __ Circuit Design by R.O. Ocaya, University of the Free State, Phuthaditjhaba, South Africa

Instrumentation Circuitry Using RMS-to-DC Converters -  Linear Technology AN106 __ Designed by Jim Williams - Feb 21st, 2007

Make Better RMS Measurements with Your DMM an 1392 -  Application Note__ Aligent

Monolithic IC for 100MHz RMS/DC Conversion -  AN22 AN22 details the theoretical and application aspects of the LT1088 thermal RMS/DC converter.  The basic theory behind thermal RMS/DC conversion is discussed and design details of the LT1088 are presented.  Circuitry for RMS/DC converters, wideband input buffers and heater protection is shown.  __ Linear Technology/Analog Devices

Nominal 10 Watt Power Amplifier -  A Very Simple 12.5 Watt RMS Power Amplifier, into an 8 ohm load and with the op-amp driver.  This was the Maximum output before Clipping on the Oscilloscope, using an 8 Ohm Resistive load.   __ Designed by G.L. Chemelec

Paralleling Rms Converters Speeds Settling -  05/11/94 EDN Design Ideas:  An rms-to-dc converter requires an output lowpass filter, which sometimes leads to overly long settling times.  Paralleling two converters reduces the circuit's settling time signal without increasing conversion errors Fig 1.  The circuit in Fig 1 monitors 50-Hz mains __ Circuit Design by Bernard Courtiol, Cegelec Soprano, Vaulx Milieu, France

Precision LVDT Signal Conditioning using Direct RMS to DC Conversion -  DN362 Design Notes__ Linear Technology/Analog Devices

RMS Output Is Linearly Proportional to Temperature Over Wide Range -  01/18/13  EDN Design Ideas:  it is known that the p-n diode can be the basis of an accurate thermometer for cryogenic temperatures up to about 200C.  A constant current is maintained through the diode and the voltage across it gives an indication of the temperature.  The magnitude of __ Circuit Design by R.O. Ocaya, University of the Free State, Phuthaditjhaba, South Africa

RMS-to-DC Conversion Just Got Easy -  DN288 Design Notes__ Linear Technology/Analog Devices

RMS-To-DC Converter Is Accurate & Stable -  09/14/95 EDN Design Ideas:  Combining the well-known true rms-to-dc circuit with a simple S/H circuit eliminates offset errors, which increases accuracy and temperature stability.  The circuit in Fig 1 uses a low-cost analog multiplier, IC 1; an integrator, IC 3A, R5, and C1; and an analog inverter,  __ Circuit Design by Sergey Velichko, SCP, Boise, ID

The SC480 50W RMS Amplifier Module-Part 1 -  At last! - an amplifier module to replace the venerable ETi-480.it has less distortion, is much quieter, has inbuilt protection and sounds a lot better.__ SiliconChip

The SC480 50W RMS Amplifier Module-Part 2 -  Everything you need to know about putting together this outstanding new power amplifier module (covers both versions).__ SiliconChip

True RMS Watt Meter -  This circuit will give you a good, Accurate Watt Meter that can measure various power levels.
in the Origional Article the Shunt was a .001 Ohm Copper Shunt giving a 1000 Watt Scale.   However, because Most Circuit Breakers in homes are 15 Amps, I made my unit to have a range of Zero to 1500 Watts. __ Designed by G.L. Chemelec


RMS (Root Mean Square) Circuits

 


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