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LASER/LED
LIGHT OUTPUT INTENSITY METER
This circuit uses a large 1cm X 1cm silicon PIN photo diode and a transimpedance
amplifier to measure the light power output of infrared and visible LEDs and laser
diodes. It can be modified to produce almost any milliwatts to volts scale factor.
It can be connected to either a multi-meter or an oscilloscope.
Light Monitor 2
The circuit below takes advantage of a low power op amp with a “rail to rail”
feature. The single resistor R1 defines the light sensitivity of the circuit.
The output voltage is directly proportional to the intensity of light striking the
small photodiode D1. In total darkness, the output voltage will hover near
zero volts. The capacitor C1 is chosen to filter our most AC components of the
light but by decreasing its value to just a few picofarads, the circuit can operate
in the tens of kilohertz range. A faster op amp will be needed for higher
speed signals.
LIGHT
RECEIVER WORKS FROM 1KHz TO OVER 70MHz
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.
OPTICAL RFID
TEST CIRCUIT
I designed this test the concept of using light techniques to send identification
data instead of RF. A more detailed discussion on this scheme can be found in the
Imagineered new products section.
SINGLE IC
FORMS SENSITIVE MODULATED LIGHT RECEIVER
The circuit uses a very inexpensive C-MOS IC that is connected to a small
photodiode. Using a unique inductive feedback network, the circuit provides high
sensitivity under high ambient light conditions. It is a great circuit when you want
to extend the range of an optical remote control transmitter.
Xenon
Lamp Flash Detector
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.
Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
Laser Light Detector, 10mhz to 20mhz - This circuit was originally designed to
detect laser light pulses for an optical Ethernet communications system. It has good
ambient light immunity.... [Designed by David A. Johnson]
Laser/LED Light Output Intensity Meter - This circuit uses a large 1cm X 1cm
silicon PIN photo diode and a transimpedance amplifier to measure the light power
output of infrared and visible LEDs and laser diodes. It can be modified to produce
almost any milliwatts to volts scale factor. It can be connected to either a
multi-meter or an oscilloscope. …. [Designed by David A. Johnson]
Light Monitor 2 - The circuit below takes advantage of a low power op amp with
a “rail to rail” feature. The single resistor R1 defines the light sensitivity of
the circuit. The output voltage is directly proportional to the intensity of light
striking the small photodiode D1. In total darkness, the output voltage will hover
near zero volts. The capacitor C1 is chosen to filter our most AC components of the
light but by decreasing its value to just a few picofarads, the circuit can operate
in the tens of kilohertz range. A faster op amp will be needed for higher speed
signals. [Designed by David A. Johnson]
Light Receiver works from 1kHz to over 70mhz - 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.... [Designed by David
A. Johnson]
Optical RFID Test Circuit - I designed this test the concept of using light
techniques to send identification data instead of RF. A more detailed discussion on
this scheme can be found in the Imagineered new products section. …. [Designed by
David A. Johnson]
Photo Transistor Interface Circuits - This page shows different ways to improve
the response time of a photo transistor circuit. …. [Designed by David A. Johnson]
Single IC Forms Sensitive Modulated Light Receiver - The circuit uses a very
inexpensive C-MOS IC that is connected to a small photodiode. Using a unique
inductive feedback network, the circuit provides high sensitivity under high ambient
light conditions. It is a great circuit when you want to extend the range of an
optical remote control transmitter.... [Designed by David A. Johnson]
Transimpedance Amp Covers DC to Gigahertz Range - 12/31/69 EDN-Design Ideas To
convert the weak, broadband signal from a fiber-optic transmission channel into
electrical form, you can use a high-impedance receiver or a transimpedance
amplifier. Either method provides the desired gain and bandwidth but removes....File
contains multiple circuits. Scroll to find this one.... [Design Idea by Lukasz
Sliwczynski and Przemysaw Krehlik, University of Mining and Metallurgy, Kraków,
Poland]
Xenon Lamp Flash Detector Amp - 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 ….
[Designed by David A. Johnson]
