From: Jim Thompson
Subject: Re: Transistors circuits by the thousands
References: <firstname.lastname@example.org> <email@example.com>
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Date: Mon, 06 Jan 2003 00:17:04 GMT
NNTP-Posting-Date: Sun, 05 Jan 2003 19:17:04 EST
Organization: Cox Communications
On Sun, 05 Jan 2003 23:59:58 GMT,
In Newsgroup: sci.electronics.design,
Entitled: "Re: Transistors circuits by the thousands",
Wrote the following:
|On Sat, 04 Jan 2003 23:24:38 GMT, Jim Thompson
|>|>At what current are you operating the 2N3904? The Beta peak for a
|>|>2N3904 is around Ic=11mA.
|>|>If the operating current is less than that, choose a smaller device.
|>|>BTW, It is bad design practice to be particularly sensitive to actual
|>|> ...Jim Thompson
|>|In my design, the 3904 was "preferred", not because of the optimal
|>|characteristics, but because of the fact that it was already used in
|>|other area's in the existing circuit.
|>What was the operating current?
|The collector current is limited to ~6 mA at saturation.
For a saturated device it is good engineering practice to design for a
forced Beta of 10.
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| Jim-T@analog_innovations.com Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |
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