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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 added 4/02) |
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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 - 05/29/08
- EDN-Design Ideas: Instead of calling math-library functions, you can multiply
integers using bit shifting.....(design idea added 09/08) |
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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) |
