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Analog Multiplier Circuits


Last Updated on: Thursday November 30, 2017


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

2-quadrant analog multiplier uses no log Amp -  10/10/96 EDN-Design Ideas You usually obtain  product of two values by summing  outputs of logarithmic amplifiers.  block diagram in Figure 1 shows a configuration that produces a two-quadrant product of analog signals but uses no log amplifiers.  VA and VB are  multiplier inputs.  triangle generator produces a linear triangle whose voltage range is between0V and  maximum value that VB can attain  (VB>=0V].  VA may assume both positive and negative values.  Figure 2 shows  circuit waveforms __ Circuit Design by Giovanni Romeo, Istituto Nazionale di Geofisica, Rome, Italy

2-quadrant multiplying DAC utilizes octal CMOS buffer -  09/30/13  EDN-Design Ideas Here's a novel approach to making a multiplying DAC __ Circuit Design by Ajoy Raman

3 Transistor Audio Amp 50 Milliwatt -  Here is a little audio Amplifier similar to what you might find in a small transistor radio __ Designed by Bill Bowden

Bit-Shifting Method Performs Fast Integer Multiplying By Fractions In C -  29-May-08 EDN-Design Ideas Instead of calling math-library functions, you can multiply integers using bit shifting __ Circuit Design by Aaron Lager, Panamax Furman, Santa Rosa, CA

Capacitance-Multiplier Power Supply -  High-quality audio amplifiers require a very efficient power supply with negligible ripple, hum and buzz.  An ordinary bridge-type power supply has a drawback in that it drops to 3 to 4 __ Electronics Projects for You

Decibel Meter -  The circuit below responds to sound pressure levels from about 60 to 70 dB.  The sound is picked up by an 8 ohm speaker, amplified by a transistor stage and one LM324 op-amp section.  You can also use a dynamic microphone but I found the speaker was more sensitive.  The remaining 3 sections of the LM324 quad op-amp are used as __ Designed by Bill Bowden

Half-flying capacitor analog multiplexer for microControllers -  This technique uses digital  I/O pins to multiplex analog voltages into an analog input on the microcontroller.  The method is most suitable for signals that do not need to be sampled frequently and it may be extended to accommodate a large number of inputs, though for a large number of inputs, the use of a separate analog multiplexer or a mincrocontroller with an integrated multiplexer would often be a better choice __ Designed by Dick Cappels

LED Decibel Meter -  The circuit below responds to sound pressure levels from about 60 to 70 dB.  The sound is picked up by an 8 ohm speaker, amplified by a transistor stage and one LM324 op-amp section.  You can also use a dynamic microphone but I found the speaker was more sensitive.  The remaining 3 sections of the LM324 quad op-amp are used as __ Designed by Bill Bowden

Rectifier tracks positive & negative peaks -  06/08/06 EDN-Design Ideas Versatile precision rectifier also delivers full-wave output __ Circuit Design by Harry Bissell Jr

Simple Circuit 3 Transistor Audio Amp 50 Milliwatt -  Here is a little audio Amplifier similar to what you might find in a small transistor radio __ Designed by Bill Bowden

Single Pulse Voltage Multiplier -  Sometimes it's necessary to generate a higher voltage pulse from logic circuits than the circuits themselves can supply.  The need to generate a programming pulse for Atmel flash controllers was one of those.  In that case, I needed to generate an infrequent pulse that __ Designed by Dick Cappels

Temperature controller has "take-back-half" convergence algorithm -  09/15/05 EDN-Design Ideas Enhanced closed-loop control balances stability, responsiveness __ Circuit Design by W Stephen Woodward, University of North Carolina, Chapel Hill, NC

Two Quadrant Analog Multiplier uses No Log Amps -  10/10/96 EDN-Design Ideas You usually obtain  product of two values by summing  outputs of logarithmic amplifiers.  block diagram in Figure 1 shows a configuration that produces a two-quadrant product of analog signals but uses no log amplifiers.  VA and VB are  multiplier inputs.  triangle generator produces a linear triangle whose voltage range is between0V and  maximum value that VB can attain  (VB>=0V].  VA may assume both positive and negative values.  Figure 2 shows  circuit waveforms __ Circuit Design by Giovanni Romeo, Istituto Nazionale di Geofisica, Rome, Italy

Two-quadrant multiplying DAC utilizes octal CMOS buffer -  09/30/13  EDN-Design Ideas Here's a novel approach to making a multiplying DAC __ Circuit Design by Ajoy Raman


Analog Multiplier Circuits


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