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+/- 1.0V Current-to-Voltage Converters - This
current to voltage converter rely on the very high
input impedance of the operational amplifier. The
input current (I) is forced through feedback…Circuit
Ideas for Designers Application Notes Advanced
Linear Devices, Inc.
+/-2.5V Current-to-Voltage Converters - Circuit
Ideas for Designers Application Notes Advanced
Linear Devices, Inc.
10mhz to 20mhz Laser Light Detector - This
circuit was originally designed to detect laser
light pulses for an optical Ethernet communications
system. It has good ambient light immunity.
1us Light Pulse Receiver Plus Post Amp - This
circuit is designed to detect very weak light pulses
lasting 1uS. It uses a tuned LC feedback network to
provide high sensitivity while giving high ambient
light immunity. A post voltage amplifier is included
with a gain of about X20. The circuit is described
in more detail in the receiver section of my
Handbook of Optical Through the Air Communications.
Note: The LF357 op amp is no longer available, this
circuit is for reference only.
4 to 20 Mloop Needs No External Power Source -
09/13/01 EDN-Design Ideas: simple circuit in Figure
1 uses a low-current-drain MAX407).
40kHz Laser Burst Detector - This circuit was
originally designed to detect weak flashed of laser
light bounced off of a fabric video projection
screen. It was used as part of a firearm training
system. It generates a 100mS output pulse whenever
it detects a 3ms to 5ms-laser burst, modulated at
40KHz. It is very sensitive and could be modified
for long-range laser communications.
40kHz Light Receiver Is Immune to Ambient Light
- If you want even more sensitivity than the above
circuit, try this design. When used with a one-centimeter
square photodiode, you can achieve a range of
several hundred feet with a standard TV or VCR
remote control module.
40kHz Modulated Light Detector - This circuit
uses a unique cascode amplifier circuit to convert
the current from a PIN photo diode to a current
without any feedback network. It is very stable and
very sensitive. The circuit shown has the potential
for a conversion factor of 10 volts per microwatt at
900nm. I included a simple JFET post-amplifier with
a gain of about 20.
Air Transparency Monitor - I designed this
circuit many years ago to monitor the quality of a
mile long column of air for future optical
communications experiments. The transmitter system
(circuit 72 below) uses a powerful xenon flash in
conjunction with a large 12 inch Fresnel lens at the
transmitter end and a matching 12-inch lens with a
PIN photo diode at the receiver. The receiver system
was connected to a weather station and a computer to
collect the changes in intensity of the light
flashes under different weather conditions. It has
the potential for a 30+-mile range. I have also used
this system to conduct cloud bounce experiments.
Air Transparency Monitor, page 2 - This is Page
2 of the receiver circuit Air Transparency Monitor,
Xenon Flash Receiver
AN-1244: Photo-Diode Current-To-Voltage
Converters - National Semiconductor
Application Note
AN-240: Wide-Range Current-To-Frequency
Converters - National Semiconductor
Application Note
AN-772: A Design & Manufacturing Guide for
the Lead Frame Chip Scale Package -
AN-772 Analog Devices Application Notes
Audio equalizer features transimpedance Q
enhancement topology - 03/06/08
EDN-Design Ideas: A novel op-amp configuration enables a graphic equalizer with
a minimal number of amplifiers. |
