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

Master Category List - Dave's Circuits

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Dave's FreeSpace (Light Beam) Communication Circuits: 
Page 1, Page 2, Page 3, Page 4, Page 5

100Khz Low Power Light Receiver  -  By starving a high speed logic inverter for current, this circuit can produce a sensitive 100KHz light receiver circuit, which is immune to ambient light, but only drawing 100 microamps from a 3 volt supply . . . [Hobby Circuit designed by David A. Johnson P.E.,  04/17/05]

 

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 Dave Johnson P.E.,  07/11/06]

100Khz Low Power Light Receiver  -  By starving a high speed logic inverter for current, this circuit can produce a sensitive 100KHz light receiver circuit, which is immune to ambient light, but only drawing 100 microamps from a 3 volt supply . . . [Hobby Circuit designed by David A. Johnson P.E.,  04/17/05]

 

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 Dave Johnson P.E.,  07/11/06]

 

1us LED Pulse Driver + Voltage to Frequency Converter  -  This circuit receives the signal from the above Amplifier and launches powerful 1uS infrared light pulses from a low cost LED that are frequency modulated by the audio information. The 10KHz center frequency of the pulse stream is low enough so a standard . . . [Hobby Circuit designed by Dave Johnson P.E.,  03/22/99]

 

30Khz Light Receiver Amp  -  This circuit uses NPN darlington transistor to Amplify the signal produced from short light flashes, as detected by a PIN photo diode.  The circuit draws only about 330uA from a 6v battery . . . [Circuit by David A. Johnson P.E.,  03/07/02]

 

40Khz Light Detector With High Ambient Light Immunity  -  This circuit is designed for detecting infrared light modulated at around 40KHz.  Itís feedback scheme cancels much of the DC component from ambient light.  Itís conversion factor is about 100 millivolts per microwatt of 900nm light.  . . . [Circuit by Dave Johnson P.E.,  07/11/06]

 

40KHz Light Detector with Sunlight Immunity  -  This hobby circuit below was designed to turn on an external 12v relay, whenever it detects light from a nearby LED light source, modulated at 40KHz to 50KHz.  This circuit was originally designed to operate from a fast moving vehicle . . . [Hobby Circuit designed by David Johnson P.E.,  07/11/06]

 

5w Fluorescent Lamp Intensity Modulator  -  The circuit was designed to experiment with using small fluorescent lamps as a broad pattern source of modulated light. The circuit hits the small lamp with narrow 1us pulses at a rate of 10KHz. Each pulse launches about 10 watts of visible light. The lamp . . . [Circuit by David A. Johnson P.E.,  06/27/00]


 

 

Dave's FreeSpace (Light Beam) Communication Circuits: 
Page 1, Page 2, Page 3, Page 4, Page 5

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