Design 12V switch using transistor

Thread Starter

athulascc

Joined Aug 15, 2014
94
hi
I need to design score broad
I need to switch 12V 7 segment display using micro controller
My supply voltage also 12V
Display takes 350mA when its all segments are lit.
so I need to confirm my design will work or Any suggestion circuit
attachment is my design
 

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ScottWang

Joined Aug 23, 2012
7,117
The common pin no need to connect to +V, because the pin was designed for the parts as relay or motor or some inductive parts.

If the c output of Q2 need 350 mA then the base must be providing 35mA, I'm afraid your circuit can't offer the heavy current.
I like to use the driver as below, it's quite normal.

5VinTo12Vout_ScottWang.gif
 
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