NPN Transistor Drive For SMA (MEC145E)

Details
Written by: Newton C. Braga

 For higher gain, driving loads up to 1 A from TTL or CMOS outputs, you can replace the transistor with a BD135 or BD137. In any case, the transistor must be mounted on a heat sink.

 

Figure 1 NPN driver for SMA.
Figure 1 NPN driver for SMA.