What is the difference between IC BT66 and UM66?

[sandeepmrocks]

i am going to build this fire alarm.
i got IC BT66 in place of UM66 . I want to ask that are BT66 and UM66 same or is their any difference of work. Also can anyone suggest any site where i can get internal circuits of the IC's UM66,TD2002,7805. thanks in advance .

 

[NascentOxygen]

i am going to build this fire alarm.
i got IC BT66 in place of UM66 . I want to ask that are BT66 and UM66 same or is their any difference of work. Also can anyone suggest any site where i can get internal circuits of the IC's UM66,TD2002,7805. thanks in advance .

Hi sandeepmrocks, http://img96.imageshack.us/img96/5725/red5e5etimes5e5e45e5e25.gif

I can't comment on BT66 vs. UM66. To find pinouts and further details, search on google using the strings UM66 "data sheet" or UM66 "application note".

Unless your construction notes give you details of the light source and LDR, you may need to do some experimentation to establish a working arrangement for whatever light source and LDR you purchase.

Happy experimenting!