Jim Thompson ha escrito:
I know, I was asking about your fewer components against doing it the right way argument. You said my requirements are ludicrous, what would be "the right way to do it" ?
I'd probably do a compound circuit somewhat like Win posted, except I'd probably use PNP-NPN complementary followers to soup up the gate drive.
Although I will say, once you use a gold-doped NPN (2N2369), the single transistor, two resistor approach ain't half bad. In fact I can think of many hobby jobs where I can replace a section of LM339 with such a scheme.
(I've built a variety of home video switching gimmicks, with the CMOS running on -5V to 0V, and the analog on ±5V ;-)
...Jim Thompson
--
| 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 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
What no one else has mentioned, is that this circuit seems like it will work to turn the FET on, but there is no provision to turn it OFF. Maybe that is OK, but usually it will laso be necessary to turn the FET off. A resistor from gate to ground would do that, at the cost of current flowing through the NPN transistor whenever it is on.
Jon
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.