phototransistor circuit driver - Electronic Circuits Projects Diagrams Free

SHAHRAM_MOJTABAIE · 23rd November 2006, 07:23 AM

hi everybody....
I want to product a photo reciver for home application
plz help me for know about newest technics .
thank

Papabravo · 23rd November 2006, 08:45 AM

So sorry to disappoint, but latest techniques are at least a half century old.

#1 Ground the emitter, add a pullup to the collector, shine a light on the base, and then turn it off. Output on the collector is inverted; it is low for light

#2 Connect the collector to Vcc, add a pulldown resistor to the emitter, shine a light on the base, and then turn it off. Output on the emitter is true; it is high for light.

SHAHRAM_MOJTABAIE · 23rd November 2006, 10:33 AM

I have a photo diod that sends oscilated photo at 10Khz and i need a circuit for reciever.

Papabravo · 23rd November 2006, 06:18 PM

Well I gave you a description of the circuit, but you couldn't follow it so here is a link to a Fairchild Application note.
http://www.fairchildsemi.com/an/AN/AN-3005.pdf

SHAHRAM_MOJTABAIE · 25th November 2006, 10:40 AM

thank you Papabravo

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23rd November 2006, 07:23 AM	(permalink)
SHAHRAM_MOJTABAIE	phototransistor circuit driver hi everybody.... I want to product a photo reciver for home application plz help me for know about newest technics . thank

23rd November 2006, 08:45 AM	(permalink)
Papabravo	So sorry to disappoint, but latest techniques are at least a half century old. #1 Ground the emitter, add a pullup to the collector, shine a light on the base, and then turn it off. Output on the collector is inverted; it is low for light #2 Connect the collector to Vcc, add a pulldown resistor to the emitter, shine a light on the base, and then turn it off. Output on the emitter is true; it is high for light.

23rd November 2006, 10:33 AM	(permalink)
SHAHRAM_MOJTABAIE	I have a photo diod that sends oscilated photo at 10Khz and i need a circuit for reciever.

23rd November 2006, 06:18 PM	(permalink)
Papabravo	Well I gave you a description of the circuit, but you couldn't follow it so here is a link to a Fairchild Application note. http://www.fairchildsemi.com/an/AN/AN-3005.pdf

25th November 2006, 10:40 AM	(permalink)
SHAHRAM_MOJTABAIE	thank you Papabravo