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2 Quadrant Analog Multiplier uses No Log Amps -
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.
3 Transistor Audio Amp 50 Milliwatt - Here is a
little audio amplifier similar to what you might find in
a small transistor radio.
Bit shifting method performs fast integer multiplying by
fractions in C - EDN-Design Ideas: Instead of
calling math-library functions, you can multiply
integers using bit shifting.
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...
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...
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
LMH730151 Triple 2:1 Multiplexer Evaluation Board -
National Semiconductor Application Note
LMH730276 4:1 Multiplexer Evaluation Board -
National Semiconductor Application Note
LMH730277 2:1 Multiplexer Evaluation Board -
National Semiconductor Application Note
Rectifier tracks positive and negative peaks
- EDN-Design Ideas: Versatile precision
rectifier also delivers full-wave output.
Simple 3 Transistor Audio Amp 50 Milliwatt
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...
Temperature controller has take back half
convergence algorithm - EDN-Design Ideas:
Enhanced closed-loop control balances stability,
responsiveness....
Two Quadrant Analog Multiplier uses No Log Amps
- 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. |
