In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Beau Schwabe wrote:

<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana">Shaun,<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana">Here is a FAQ that might help... [url=http://forums.parallax.com/forums/attach.aspx?a=2347][b]<SPAN style="COLOR: #000033; FONT-FAMILY: Verdana; TEXT-DECORATION: none; text-underline: none">Don't get HOT choosing the wrong transistor[/b][/url]<o:p></o:p>

<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana">Even though it references a motor in the schematic, a Relay, Light bulb, Solenoid, etc. could just as easily be substituted.<o:p></o:p>

<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana">Note: Because your transistor is a <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:place><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana">Darlington</st1:place><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana"> and the B-E saturation voltage is 1.8  ... use 1.8V in place of the 0.6V in the formulas above.<o:p></o:p>

<o:p>[3] [/3]</o:p>

<o:p>[3] [/3]</o:p>



 
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