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Circuits designed by David Johnson, P.E.
Last Updated on: Thursday, April 07, 2016 02:04 PM

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High Frequency Amp Circuits

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 Dave 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 Johnson P.E.,  07/11/06]


20Mhz VCSEL 3mw Laser Test Circuit  -  This circuit takes advantage of some new vertical cavity surface emitting lasers (VCSEL) that donít require light output control circuits. The circuit shows how to drive the device from a single high speed CMOS IC . . . [Circuit by Dave Johnson P.E.,  06/17/00]

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 A. Johnson P.E.,  06/09/00]

 

3mw Laser Test-20Mhz VCSEL  -  This circuit takes advantage of some new vertical cavity surface emitting lasers (VCSEL) that donít require light output control circuits. The circuit shows how to drive the device from a single high speed CMOS IC . . . [Hobby Circuit designed by Dave Johnson P.E.,  06/17/00]

 

50/60Hz Sync Generator-Fully Isolated  -  This circuit will produce a single pulse at the zero voltage cross points of the power line voltage.  An opto-coupler provides a very safe 5KV isolation . . . [Circuit by David A. Johnson P.E.,  12/12/04]


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 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]


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 Dave 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 Dave Johnson P.E.,  06/04/00]


Brownout Voltage Tester  -  I used this circuit years ago to test AC line powered devices under 95vac line voltage conditions.  It has a rating of 250 watts.  . . . [Hobby Circuit designed by Dave Johnson P.E.,  07/12/06]


Characteristics of CMOS Logic Inverter Amplifiers  -  This chart shows some of the measured characteristics of three different unbuffered CMOS logic gates, used as voltage Amplifiers . . . [Hobby Circuit designed by Dave Johnson P.E.,  02/11/02]


CMOS Logic Inverter Amplifier Characteristics  -  This chart shows some of the measured characteristics of three different unbuffered CMOS logic gates, used as voltage Amplifiers . . . [Circuit by David Johnson P.E.,  02/11/02]


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 Johnson P.E.,  06/17/00]


Form Push-Pull Driver using N-Ch And P-Ch Transistors   -  This circuit can produce high speed output signals with fast rise and full times. The unique change pump action allows the voltage of the upper P-ch device to range from millivolts to hundreds of volts. The output current is only limited by the rating of . . . [Hobby Circuit designed by David Johnson P.E.,  06/27/00]


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 Dave Johnson P.E.,  06/17/00]


Laser Light Detyector-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 . . . [Hobby Circuit designed by Dave Johnson P.E.,  06/14/00]


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


N-Ch & P-Ch Transistor Form Push-Pull Driver  -  This circuit can produce high speed output signals with fast rise and full times. The unique change pump action allows the voltage of the upper P-ch device to range from millivolts to hundreds of volts. The output current is only limited by the rating of . . . [Circuit by Dave Johnson P.E.,  06/27/00]


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 by David Johnson P.E.,  06/04/00]


Tester for Brown Out Voltage  -  I used this circuit years ago to test AC line powered devices under 95vac line voltage conditions.  It has a rating of 250 watts.  . . . [Circuit by Dave Johnson P.E.,  07/12/06]


Wide Band Zero Cross Detector  -  This circuit was designed to convert a low Amplitude 40KHz signal into a clean square wave signal.  It will work with inputs as small as 5mv peak-to-peak or as large as 3 volts peak to peak.  The input frequency can range from a few kilohertz to about 150 . . . [Circuit by Dave Johnson P.E.,  02/18/06]

 

Zero-Cross Detector-Wide Band  -  This circuit was designed to convert a low Amplitude 40KHz signal into a clean square wave signal.  It will work with inputs as small as 5mv peak-to-peak or as large as 3 volts peak to peak.  The input frequency can range from a few kilohertz to about 151 . . . [Hobby Circuit designed by David Johnson P.E.,  02/18/06]

More Amplifier Circuits
High Frequency Amp Circuits

Dave's Amplifier Circuits:      Audio       Buffers         High Frequency-HighSpeed-Wide Band       
High Impedance Circuits      Low Noise      RF (Radio Frequency)        Transimpedance            
Variable Gain     Current to Voltage Converter


Master Category List - Dave's Circuits


HOME Schematics Index Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches


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