pnp transistor switch

Thread Starter

becky

Joined Aug 28, 2005
1
Hi,
My brain is still thinking about the summer and I have forgotten how to figure the saturation current for a pnp transistor switch. Do I use the Ω of the resistor before the switch on the B line with the Vdc input or do I use the Ω of the coil of the relay on the bottom with the Vdc? I would have to subtract the .7V from the Vdc no matter which Ω I use, right?
Thanks!
Becky
 

mozikluv

Joined Jan 22, 2004
1,437
Originally posted by becky@Aug 28 2005, 01:43 PM
Hi,
My brain is still thinking about the summer and I have forgotten how to figure the saturation current for a pnp transistor switch. Do I use the Ω of the resistor before the switch on the B line with the Vdc input or do I use the Ω of the coil of the relay on the bottom with the Vdc? I would have to subtract the .7V from the Vdc no matter which Ω I use, right?
Thanks!
Becky
[post=9985]Quoted post[/post]​

hi becky,

use the coil resistance for your current supply :D
 
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