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Circuits designed by David Johnson, P.E.
Last Updated on: Monday, July 11, 2016 01:59 PM

Master Category List - Dave's Circuits

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Dave's Transimpedance Amplifiers:  Page 1,     Page 2,     Page 3

Transimpedance Circuits

10 Second Ultra 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 . . . [Circuit by David A. Johnson P.E.,  05/29/00]


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 . . . [Circuit by David Johnson P.E.,  06/14/00]

 

10Mhz to 20Mhz Light Receiver  -  Light power to volts conversion = APPROX. 15mV per microwatt at 850nM . . . [Circuit by David A. Johnson P.E.,  07/11/06]

1Khz to Over 70Mhz 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 . . . [Hobby Circuit designed by David Johnson P.E.,  06/11/00]


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.,  03/11/99]


1uS Light Pulse Receiver + 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. . . . [Circuit by David Johnson P.E.,  03/11/99]


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.,  06/09/00]


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.,  06/13/00]


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.,  06/14/00]


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.,  03/12/99]


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.,  06/04/00]


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.,  06/04/00]


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.,  06/17/00]


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.,  06/17/00]


Air Transparency Monitor-Pg2  -  This is Page 2 of the receiver circuit AIR TRANSPARENCY MONITOR, XENON FLASH RECEIVER . . . [Circuit by David Johnson P.E.,  06/17/00]


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.,  06/09/00]


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.,  06/04/00]


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.,  02/15/02]


Dave's Transimpedance Amplifiers:  Page 1,     Page 2,     Page 3

Transimpedance Circuits

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