The unknown IC and the Sony SBX8025-F

[Peter]

How to hack the 3 pin sensor:

connect a 5V supply through 2 1k resistors and a 5mA led like so (use 
fixed font to view ascii art):


+5v---*----1K----A LED K---- (1) (Out) To Sensor IC
       |
       +----1K--------------- (2) (Vdd)

GND------------------------- (3) (Gnd)


Connect the 1,2,3 contacts to the remote receiver in all possible 
combinations and notice which causes the led to blink if you fire a tv 
known good (!!!) remote at it (not from too close i.e. cca 1 meter). You 
may have to shield the IC from desk lamps etc. to have it work.

Additional hint: with most non-power ICs the lowest reading reverse 
diode (found with a dvm on the diode scale by randomly measuring between 
pins) is the Vdd-Vss reverse junction, i.e. you found the power pins 
(plus will be on the black wire of the dvm and minus on the red). Of 
course there is no guarantee.

You have to use a 5mA, preferrably red led. If not (using an ordinary 
led), the light emitted will be extremely dim.

You do this at your own risk, you get to keep the (unlikely) smoke that 
you let out etc. The circuit shown should be safe for 'hacking' sensors, 
it passes at most 5mA per pin. I have used it with success many times 
before.

Peter
--
The Toronto Linux Users Group.      Meetings: http://tlug.ss.org
TLUG requests: Linux topics, No HTML, wrap text below 80 columns
How to UNSUBSCRIBE: http://tlug.ss.org/subscribe.shtml