Help: with my transistor circuit project.

[galz]

Hi ,

I have this problem of making ttl output to act as switch to a 12v external circuit,
here's my setup: 

i am using an npn transistor as the switch, from a 12v (6A) power supply, connected to my load (which is a 12 v lamp) which s is then connected to the collector of the npn, the emitter goes to ground, and the base comes from the TTL IC

basing from a diagram i got from a book, i could say it would work out just fine, but what happened in my circuit was, the transistor cannot turn on my 12v lamp. I dont think I have a faulty transistor, coz I've tested it.... I am using a bc845 npn transistor


do I really need a relay(electromechanical) for this one?
is  there any way I can work this out without including a relay?

hope you guys can help me with this ...

thanks



 

[0b00000111]

papost na lang dito sir ng schematicdiag

[RaffT]

papost na lang dito sir ng schematicdiag

nosebleed ka yata? di mo nagets? hehehehe 

[0b00000111]

nosebleed ka yata? di mo nagets? hehehehe 

nagets ko naman. mas maganda rin kasi kung post nya ang schematic diagram.. "A picture is worth a thousand words"

[RaffT]

nagets ko naman. mas maganda rin kasi kung post nya ang schematic diagram.. "A picture is worth a thousand words"

charing ..sabagay.. hehehe your right

[danny]

kasi pag na post yung schematic mas ma analyze maigi
saka mas ma eexplain ni sis hehehhe
 

[Shey]

Hi ,

I have this problem of making ttl output to act as switch to a 12v external circuit,
here's my setup: 

i am using an npn transistor as the switch, from a 12v (6A) power supply, connected to my load (which is a 12 v lamp) which s is then connected to the collector of the npn, the emitter goes to ground, and the base comes from the TTL IC

basing from a diagram i got from a book, i could say it would work out just fine, but what happened in my circuit was, the transistor cannot turn on my 12v lamp. I dont think I have a faulty transistor, coz I've tested it.... I am using a bc845 npn transistor


do I really need a relay(electromechanical) for this one?
is  there any way I can work this out without including a relay?

hope you guys can help me with this ...

thanks

based on your description it seems like hindi kayang i-drive ng TTL transistor mo yung power transistor mo.. in that case you can use a darlington connected output transistor yung unahan is 2SC1061 at yung naka-connect sa lamp ay 2N3055..

[galz]

based on your description it seems like hindi kayang i-drive ng TTL transistor mo yung power transistor mo.. in that case you can use a darlington connected output transistor yung unahan is 2SC1061 at yung naka-connect sa lamp ay 2N3055..

thanks
salamat bai
 ...... ill try this one 

[nath630]

..cge nga po chech nyo ngayon in circuit kung ung emmiter nga naka ground and collector to the load...

double check lang po...baka po nagkamali nung nasa board na,,,hehehehe

madalas mangyari sakin,,,,nasusundan ko pcb layout,,,eh sa likod pala component...hhehehhe

[galz]

@electron

ayos nakuha ko rin, di ko na ginamit ang 3055, kaya ng 1061, pero naka darlington din sa gamit kong transistor 

thanks a lot