K2633 Problem

Kits PC Related Projects
1

Hi,

I just mount the Kit ans it doesn’t work at all.

I check all resisitors, polarity of the led and diodes, position of the transistors and possible shortcuts… Nothing

The behaviour is as follow :
I supply 9V DC to VDC and put I1 to the ground. The corresponding led start burning well but I do not hear any switch.

Could someone help ? Thanks.

2

What value did you put for Rx ?
Do you have the same behaviour on all four channels ?
What happens if you short C and E (outer pins) of the corresponding transistor ?
Are the values of R1 to R4 correct ?