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Analog Multiplier Circuits
Last Updated on:
Monday, October 03, 2011 06:07 PM |
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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2 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.... [Design Idea by Giovanni Romeo,
Istituto Nazionale di Geofisica, Rome, Italy] |
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3 Transistor Audio Amp 50 Milliwatt - Here is a little audio
amplifier similar to what you might find in a small transistor radio.
(electronic circuit added 11/05) |
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Bit-shifting method
performs fast integer multiplying by fractions in C - 29-May-08 Issue
of EDN Instead of calling math-library functions, you can multiply
integers using bit shifting.... [Design Idea by Aaron Lager, Panamax
Furman, Santa Rosa, CA] |
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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....(electronic circuit added 10/05) |
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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.... (circuit added 6/07)
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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....(electronic circuit added 10/05) |
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LMH730151 Triple 2:1 Multiplexer Evaluation Board - National Semiconductor
Application Note (app note added 2/06) |
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LMH730276 4:1 Multiplexer Evaluation Board - National Semiconductor Application Note
(app note added 2/06) |
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LMH730277 2:1 Multiplexer Evaluation Board - National Semiconductor Application Note
(app note added 2/06) |
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Rectifier tracks positive & negative peaks - 06/08/06 EDN-Design Ideas Versatile
precision rectifier also delivers full-wave output....[Design Idea added 9/08] EDN
migrating links. This link is not verified. Search the "title" + EDN for new link.
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Simple 3 Transistor Audio Amp 50 Milliwatt - (electronic circuit added 11/05)
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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....(schematic / circuit added 6/07)
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Temperature controller has "take-back-half" convergence algorithm - 15-Sep-05 Issue
of EDN Enhanced closed-loop control balances stability, responsiveness.... [Design Idea
by W Stephen Woodward, University of North Carolina, Chapel Hill, NC; Edited by Brad
Thompson and Fran Granville] |
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Two Quadrant Analog Multiplier uses No Log Amps - 10/10/96 EDN-Design Ideas You
usually obtain the product of two values by summing the outputs of logarithmic amplifiers.
The 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 the multiplier inputs. The
triangle generator produces a linear triangle....[Design Idea added 4/02] EDN migrating
links. This link is not verified. Search the "title" + "EDN" for new link. |
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