RE: 4 Transistors to put your Parts Kit

DAB — Wed, 23 Apr 2014 19:06:33 GMT

I would add the venerable 2N2222.

Its a staple for quick designs.

DAB

RE: 4 Transistors to put your Parts Kit

michaelkellett — Wed, 23 Apr 2014 08:17:03 GMT

In your blog reached by the link you incorrectly define high and low side switch.

"NPN Transistors are used in high-side switch circuits. This means whatever you want to control is connected between the high voltage and the collector of the transistor."

Here's a link to an article with some useful information, including a correct definition:

"The definition of a high-side load switch is that it is controlled by an external enable signal, and connects or disconnects a power source (battery or adaptor) to a given load. Compared to a low-side load switch, a high-side switch sources current to the load, while the low-side type connects or disconnects the load to ground, and therefore sinks current from the load."