Hi there is does anybody know if there is an equivalent replacement to having two BC108C transistors in a Darlington pair in a circuit ?

 

Looks like a "nothing special" NPN to me. What is the application?

 

Looks like a "nothing special" NPN to me. What is the application?

I'm new to electronics but i managed to make a circuit from an existing LED chaser circuit with a few mods.

I am trying to use the transistors as a current gain.

 

Yes, a real Darlington transistor..but why spend a dollar when you can do it with a pair of 7 cent transistors?

yeah, yeah, I know...you didn't get the deal I got at www.mouser.com

 

Yes, a real Darlington transistor..but why spend a dollar when you can do it with a pair of 7 cent transistors?

yeah, yeah, I know...you didn't get the deal I got at www.mouser.com

Thanks looks a bit complicated tho

 

Thanks looks a bit complicated tho

OK. So buy a real Darlington transistor. Post a schematic and we'll help you get the resistors right.

The, "c" version is the high gain selection, so you can't fake it with a different version. This will just have to be a Darlington.

 

I Know that the BC108C has a current gain of 420 but in a darlington pair what is the current gain together?

 

usually around 10,000

 

Here's the pdf of MPSA13 & 14. The current gain is on page 2 as hFE.

Allen