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1us Light Pulse Receiver
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 . . . Hobby Circuit designed by Dave Johnson P.E.-March, 1999
2Mhz Broad Band Optical Fiber Receiver
If you need more sensitivity than the above circuit this circuit provides about ten times more gain. It too is designed around an inexpensive plastic optical fiber detector . . . Hobby Circuit designed by David Johnson P.E.-June, 2000
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,. . . Circuit by David Johnson P.E.-June, 2000
40KHz Light Receiver Front-End Circuit
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. This hobby 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.. . . Circuit by David Johnson P.E.-June, 2000
40KHz Modulated Light Detector
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. . . Circuit by David A. Johnson P.E.-March, 1999
4-20-mA loop needs no external power source
09/13/01 EDN-Design Ideas The simple circuit in Figure 1 uses a low-current-drain MAX4073H amplifier to sense the current flowing through a 4- to 20-mA loop. The circuit senses the current through a 1Ω resistor with a fixed gain of 100 and uses no battery__ Circuit Design by Shyam Tiwari, Sensors Private Ltd, Gwalior, India
50Mhz Broad Band Optical Fiber Receiver Version A
If the above circuit it still too slow, you can try this circuit. What it lacks in sensitivity it makes up for in speed. The circuit attaches a plastic fiber optic PIN photodiode assembly to a small box containing a small 3v battery and a standard. . . Circuit by David A. Johnson P.E.-June, 2000
5Mhz Broad Band Optical Fiber Receiver
This circuit is a simple broad band light detector that uses a very inexpensive IC and a PIN photodiode that is packaged for use with plastic optical fibers. It has a bandwidth from 1KHz to over 5MHz. It is great for experimenting with various modulated. . . Circuit by David A. Johnson P.E.-June, 2000
AIR Transparency Monitor, Xenon Flash Receiver
I designed this receiver 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. . . Circuit by Dave Johnson P.E.-June, 2000
AIR Transparency Monitor, Xenon Flash Transmitter
This is the matching transmitter for the above receiver. The transmitter launches powerful 1000-watt light pulses that last about 20 microseconds. . . Circuit by Dave Johnson P.E.-June, 2000
AIR Transparency Monitor-Pg2
This is of the receiver circuit AIR TRANSPARENCY MONITOR, XENON FLASH RECEIVER. . . Circuit by David Johnson P.E.-June, 2000
Audio-test accessory isolates & matches loads
03/16/06 EDN-Design Ideas This low-cost, switchable, dual-impedance transformation circuit comprises a single conventional transformer and two minimum-loss pads__ Circuit Design by Richard M Kurzrok, RMK Consultants, Queens Village, NY
Broad Band 2Mhz Optical Fiber Receiver
If you need more sensitivity than the above circuit this circuit provides about ten times more gain. It too is designed around an inexpensive plastic optical fiber detector. . . Circuit by David Johnson P.E.-June, 2000
Broad Band 50Mhz Optical Fiber Receiver Version A
If the above circuit it still too slow, you can try this circuit. What it lacks in sensitivity it makes up for in speed. The circuit attaches a plastic fiber optic PIN photodiode assembly to a small box containing a small 3v battery and a standard . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000
Cascode Light Receiver Circuit
This page provides a detailed explanation of how the modified cascode light receiver circuit operates. The cascode technique in conjunction with an inductive load provides very high current to voltage conversion as well as very high speed. . . Circuit by David A. Johnson P.E.-February, 2002
Current-to-Voltage Converters
Circuit Ideas for Designers App Note __ Advanced Linear Devices, Inc
Detects Xenon Lamp Flash
This circuit has a very low standby current requirement yet has very high sensitivity toward the light flashes from a xenon lamp. When connected to a flip/flop it can serve as an on on/off Controller . . . Hobby Circuit designed by David Johnson P.E.-December, 2004
Dual-Channel Colorimeter with Programmable Gain Transimpedance Amplifiers & Synchronous Detectors
Figure 5 shows the noise in this configuration, which is less than 1 LSB for one of the channels (ADC input centered between two codes) and 1 LSB peak-to-peak for the other channel (ADC input in transition region between adjacent codes). The CN-0312 Evaluation Software communicates with the EVAL-SDP-CB1Z to capture data from the EVAL-CN0312-SDPZ Equipment Needed The following equipment is needed: , Bullet text, Getting Started Load the evaluation software by placing the CN-0312 Evaluation Software into the CD drive of the PC. Using My Computer, locate the drive that contains the evaluation software and open the Readme file. __ Analog Devices from the Lab
FET Input High Speed Light Detector
This circuit is yet another design that converts current from a PIN photo diode to a voltage. It has a bandwidth that extends beyond 50MHz. . . Circuit by David A. Johnson P.E.-June, 2000
Get 100dB Stopband Attenuation with the LTC1562 Universal Filter Family
DN195 Design Notes __ Linear Technology/Analog Devices
High Precision Current-to-Voltage Converters
Circuit Ideas for Designers App Note __ Advanced Linear Devices, Inc
High Speed Light Detector from FET Input
This circuit is yet another design that converts current from a PIN photo diode to a voltage. It has a bandwidth that extends beyond 50MHz . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000
Highly Stable Lower Power Oscillator
This circuit works much like the classic 555 timer, but draws only about 1.5 microamps from a 3 volt battery. It is highly stable under varying temperature and supply voltages . . . Hobby Circuit designed by David Johnson P.E.-May, 2000
High-Side Transimpedance Amplifier & APD Monitor
Current through a photodiode with a large reverse bias potential is converted to a ground referenced output voltage directly through an LTC6101. The supply rail can be as high as 70V. Gain of the I to V conversion, the trans- impedance, is set by the selection of resistor RL. __ Linear Technology/Analog Devices App Note, Mar 30th 2010
High-speed 75MHz light receiver
This circuit uses one tiny C-MOS inverter IC to form a modulated light receiver with a very fast response. It is designed around a PIN photo diode that is packaged for use with plastic optical fibers. It can be used as an optical fiber receiver. By using the open end of the optical fiber it can "sniff" out any modulated light signals. . . Circuit by David Johnson P.E.-June, 2000 |
