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Optic Circuits
Optic / Optical Circuits:   #'s - K      L - Z

  Last Updated: October 24, 2017 02:55 PM

Circuits Designed by Dave Johnson, P.E. :
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. . . Circuit by David A. Johnson P.E.-June, 2000

Low-power optical interrupter -  This circuit is great for battery-powered systems that use slotted type optical interrupters.  It draws only 10uA from a 3v battery that should allow up to 5 years of operation from a lithium battery. . . Circuit by David A. Johnson P.E.-June, 2000

Optical Interrupter Draws Microamps -  This circuit is great for battery-powered systems that use slotted type optical interrupters.  It draws only 10uA from a 3v battery that should allow up to 5 years of operation from a lithium battery. . . Circuit by Dave Johnson P.E.-June, 2000

Optical RFID Test Circuit -  I designed this test the concept of using light techniques to send identification data instead of RF.. . . Circuit by David A. Johnson P.E.-February, 2002

Simple Circuit Negative Supply Circuit -  This simple circuit consists of two LEDs and a photo diode.  It generates a negative voltage with a current level of a couple milliamps.  It is ideal for supplying a negative rail to low power “rail to rail” op amp circuits, which need to have a true zero volts output.  Note:  This circuit is not particularly efficient . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2006

Slotted-Type Optical Interrupter Draws Microamps -  This circuit is great for battery-powered systems that use slotted type optical interrupters.  It draws only 10uA from a 3v battery that should allow up to 5 years of operation from a lithium battery . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

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. . . Circuit by David A. Johnson P.E.-June, 2000

Low-power optical interrupter -  This circuit is great for battery-powered systems that use slotted type optical interrupters.  It draws only 10uA from a 3v battery that should allow up to 5 years of operation from a lithium battery. . . Circuit by David A. Johnson P.E.-June, 2000

Measuring Extinction Ratio of Optical Transmitters -  Application Note__ Aligent

One chip Detects optical interruptions -  03/01/01  EDN Design Ideas:  Setting up a light beam and detector to count objects on a conveyer belt, sense security intrusions, or drive a tachometer is simple.  However, the task is no longer trivial if you add ambient light or multiple beams, limit optical power, or extend the dis __ Circuit Design by Frederick M Baumgartner, FM Broadcast Services, Parker, CO

Optical All-Loss Test Solution -  Application Note__ Aligent

Optical and/or Magnetic Preamplifier-Using Models 350P & 365P  -  No description, just schematic - OpAmps Lab Inc is the manufactor of Amplifiers (Video / Audio / Distribution / Microphone / Equalization / Line / VCA / Power) , Switchers (Routing / Assign / Matrix) , Mult (Press) (Network-Feed) Boxes, Audio Transformers, Oscillators, Power-Supplies, Custom Sub-Systems.  __ Application OpAmps Lab Inc.

Optical Channel Identification on the ADN284x Laser Drivers -  AN-658 Analog Devices App Note - Designed by

Optical Encoder Controls Range Switch -  10/08/98 EDN Design Ideas:  (Several circuits included, scroll to find this one) Instead of using a counter-controlled, pushbutton-activated range switch, you can use an optical encoder.  Inexpensive encoders are available, and they occupy minimal space on the front panel of an instrument __ Circuit Design by W Dijkstra, Waalre, The Netherlands

Optical feedback extends white LEDs' operating life -  01/18/07  EDN Design Ideas:  PWM-controller loop stabilizes light output __ Circuit Design by Bjoy Santos, Intersil Corp, Milpitas, CA

Optical Fiber Receiver-5Mhz Broad Band -  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_ Hobby Circuit designed David Johnson P.E.

Optical Interrupter Draws Microamps -  This circuit is great for battery-powered systems that use slotted type optical interrupters.  It draws only 10uA from a 3v battery that should allow up to 5 years of operation from a lithium battery. . . Circuit by Dave Johnson P.E.-June, 2000

Optical RFID Test Circuit -  I designed this test the concept of using light techniques to send identification data instead of RF.. . . Circuit by David A. Johnson P.E.-February, 2002

Optical sensor needs no tweaking -  06/13/02 EDN Design Ideas:  The transfer gain of optical sensors spans a 16-to-1 ratio because of variations in the LED, phototransistor, ambient temperature, and optical path.  The wide transfer-gain variation complicates output-resistor selection in dc-coupled circuits.  You must size the output resistor to prevent high transfer gains from causing output-stage saturation, but low transfer gains yield low output-voltage sw __ Circuit Design by Ron Mancini, Texas Instruments, Bushnell, FL

Optical Slave Flash Trigger -  The synchronizer ensures a contact-free, optical synchronization of external photographic flashguns.  The triggering of the external flash is derived from embedded flashes of a camera.  It can be used for both digital and "analogous" cameras or for a remote synchronization of the actual flash units.  Its use is optimal especially with digital cameras (DC) , where extraordinary adaptability for different systems will stand out.  It is capable of eliminating the effect of any measuring pre-flashes.  The synchronizer thus perfectly fulfils the role of a device often called the Slave Flash Trigger (SFT)  __ Designed by © Pavel Janko

Optical Smoke Detector -  This optical smoke detector uses a low-cost, readily-available, slotted, through-scan, infrared photo-switch.  When smoke is detected, the relay energises to activate the audio/visual warning alarm.  Fig.1 shows the circuit of the...__ Electronics Projects for You

Optical Spectrum Analysis Basics -  Application Note__ Aligent

Optical string-tuning tool -  This tool assists you in tuning your string instrument to a given tone.  It utilizes the stroboscopic effect to give feedback about the adjustment of your instrument.  The two LEDs on the board blink with the frequency that the chosen tone has.  When__ 

Optical tachometer provides bidirectional info -  05/21/98 Design Ideas - (Multiple circuits listed, scroll to find this one) Optical tachometers have many advantages in precision servo applications.  Compared with dc-generator types, optical tachs are relatively inexpensive and, because they lack wear-prone commutator brushes, they're long-lived.  Frequency-to-voltage conversion circuits provide a convenient means to integrate the output of optical tachs into analog, unidirectional motion-control loops.  However, for bidirectional servos, where you need a bipolar angular-velocity readout, you need a more unconventional solution, such as the circuit in Figure 1.    __ Circuit Design by Stephen Woodward, University of North Carolina, Chapel Hill

Optical Toggle Switch using a Single Chip -  Using dual flip-flop IC CD4027 employ a 555 based monostable circuit to supply input clock pulses.  The circuit described here obviates this requirement.  One of the two flip-flops within IC CD4027 itself acts as square wave shaper__ 

Optically Isolated Overcurrent Detector Works from AC Mains -  10/06/11  EDN Design Ideas:  The circuit uses two opto-transistors you arrange for bipolar sensing.  The circuit in this Design Idea detects short-circuit faults or excess-current conditions in line-operated equipment, such as a UPS (uninterruptible power supply) , across an isolation boundary.  If the load current rises higher than a predetermined level, the circuit generates a 5V pulse to immediately shut down the power inverter.  This compact circuit provide as a reliable means for protecting power semiconductors and batteries against overcurrent conditions.  It features an isolated output and a fast response.  The ac mains self-power the sensing network.   __ Circuit Design by José M Espí, Jaime Castelló, Rafael García-Gil, and Marcos Arasa, University of Valencia, Valencia, Spain

Optically isolated stepper Motor controller -  These are some very high-level instructions for building the Opto-Isolated Stepper Motor Controller. Not really a lot to say. Most of the construction is self-explanatory using the PCB artwork, the overlay, and the schematic. Note that the pad for pin 1 on ICs and such are square to help in proper placement. All ICs on the board are NOT oriented the same way, so pay attention. __  Contact:  wrb @ cbnews . att.com

OPTI-LOOP Architecture Reduces Output Capacitance & Improves Transient Response -  AN76 Loop compensation is an uncomfortable subject for many engineers.  Experienced power supply designers know that optimum loop compensation is necessary to get the best performance from their power supplies.  This App Note discusses power supply loop__ Linear Technology/Analog Devices

Photonic Foundation Library: Enhancing Swept Loss Measurements -  Application Note__ Aligent

Polarization Dependent Loss Measurements of passive optical components -  Application Note__ Aligent

Projection Booth-Dual-Optical System-Using Models 350P, 440C & 536  -  No description, just schematic - OpAmps Lab Inc is the manufactor ofAmplifiers (Video / Audio / Distribution / Microphone / Equalization / Line / VCA / Power) , Switchers (Routing / Assign / Matrix) , Mult (Press) (Network-Feed) Boxes, Audio Transformers, Oscillators, Power-Supplies, Custom Sub-Systems.  __ Application OpAmps Lab Inc.

Remote Switch Uses No-Power Fiber-Optic Link -  10/10/96 EDN Design Ideas:  The heavy-duty switching device in Figure 1 counts the number of products manufactured and rolled out of a production line per hour.  The switch is useful for counting rolling heavy objects or materials weighing one to several thousand kilograms.  It generates one pulse per __ Circuit Design by Shyam Tiwari, IGKAR, Kalpakkam, India

Rotational (or linear) measurement using an optical Mouse sensor -  EDN Design Ideas:  04/27/2015    A novel way to measure X-Y or rotational speed or position is presented in This design idea      __ Circuit Design by Anatoly Besplemennov

Sensor Derives Power From Laser Over Fiber -  02/15/96 EDN Design Ideas:  The photovoltaic power-supply circuit in Figure 1 delivers 3.34V (±1.67V) at 5 to 20 mA to a low-power data-acquisition circuit.  The total conversion efficiency is 40%; you can thus use a low-cost laser as the power source.  The LM385Z shunt-regulates the photovoltaic converter at 1.67V output.  This voltage is close to the optimum power-out value for the converter, which specs a 2V open-circuit output.  The MAX665 voltage-inverter circuit provide as about 95% efficiency vs the 83% you'd obtain from a boost switcher, whose high start-up currents could cause the circuit to hang up.  Moreover, the inverter doubler does not produce current spikes, and its ramp-shaped ripple is easy to filter.  Low power-supply noise is important in powering a 12-bit ADC at 3.3V (1 LSB=0.8 mV).  Note that pin 5 of the instrumentation amplifier connects to the 1/2VCC point rather than to the negative rail. __ Circuit Design by Noor Khalsa, EG&G Los Alamos, NM

Simple Circuit Negative Supply Circuit -  This simple circuit consists of two LEDs and a photo diode.  It generates a negative voltage with a current level of a couple milliamps.  It is ideal for supplying a negative rail to low power “rail to rail” op amp circuits, which need to have a true zero volts output.  Note:  This circuit is not particularly efficient . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2006

Single chip Detects optical interruptions -  03/01/01  EDN Design Ideas:  Setting up a light beam and detector to count objects on a conveyer belt, sense security intrusions, or drive a tachometer is simple.  However, the task is no longer trivial if you add ambient light or multiple beams, limit optical power, or extend the dis __ Circuit Design by Frederick M Baumgartner, FM Broadcast Services, Parker, CO

Slotted-Type Optical Interrupter Draws Microamps -  This circuit is great for battery-powered systems that use slotted type optical interrupters.  It draws only 10uA from a 3v battery that should allow up to 5 years of operation from a lithium battery . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000

State of the Art characterization of optical components for DWDM applications -  Application Note__ Aligent

Variable Optical Attenuator in BER Test Applications -  Application Note__ Aligent


Optic / Optical Circuits:   #'s - K      L - Z

 


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