Darlington Phototransistor - can i fudge one from an NPN phototransistor ??

[Nick Mulder]

Hi,

I am keen to make the circuit outlined here:

http://www.aaroncake.net/circuits/slave.htm

it calls for a '2N5777 NPN Darlington Phototransistor' of which I am yet to find a supply of here in NZ - upon looking at the symbol used for the Darlington Phototransistor in the cct diagram in the link above it seems to be two transistors cascaded together one being a Phototransistor and the other a normal transistor...

I dont know much about transistors and especially darlington types but if they are simply a bundled package of two transistors could i make a substitute from the discrete versions ?

I ask this as I have a simple NPN Phototransistor here already and a PNP and NPN from other projects I could use..

is it as simple as that ?

 

[ante1]

Hi Mulder,

You could try Farnell http://nz.farnell.com/jsp/home/homepage.jsp  nr. 1021141, it should work.

 

[audioguru2]

In "the good old days", there was a photoSCR that could do a remote strobe-flash, all by itself. I think it was made by GE.

 

[Nick Mulder]

Hi Mulder,

You could try Farnell http://nz.farnell.com/jsp/home/homepage.jsp

 

[ante1]

Hi Mulder,

I don’t know where I got that number, it should be: 327542, sorry! :-[

It's cheaper too! ;D