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Subject: Re: what sort of transistor should I use
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Wed, 06 Nov 2002 09:21:37 GMT
NNTP-Posting-Date: Wed, 06 Nov 2002 10:21:37 MET
"Mike Poulton" schrieb im Newsbeitrag
> (Bob Wilson) said:
> > Transistor power dissipation here is basically irrelivant. He is using
> > it as a switch, and in that mode, power dissipation is going to be
> > much lower than what it can tolerate.
> So you would use a little TO-92 transistor to drive the coil of a car
> starter solenoid? Bipolar transistors are not know for their excellent
> switching characteristics. In fact, they kinda suck for switching,
> which is why mosfets are so popular in applications like this. If his
> relay has a big coil, he may need a TO-220 device to handle the power
But he is talking about 4 batteries. A bipolar junction transistor in a TO92
is probably one of the best choices. ZTX617 with only 14mV=Usat 0.2A and
300 beta seems not so easy to beat.
electronic hardware designer
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