By: obedey (IP: 220.245.178.*)
Written on: 27-08-2005 05:53
sorry about double post but does anyone know where I can find like a dummies guide to MOSFETs. Id like to learn how they work. |
By: Tillmann (IP: 172.179.44.*)
Written on: 27-08-2005 12:14
Hi,
probably the part you mentioned will work. Any N-channel MOSFET will work, as long as it's powerful enough (this part is) and it's not some exotic part (e.g. depletion type).
Understanding MOSFETs is a complex issue. I recommend this link:
http://www.st-andrews.ac.uk/~www_pa/Scots_Guide/first11/part7/page1.html
The first sentence in the introduction is a good simple summary about what a MOSFET is:
"The Field Effect Transistor is a device which enables us to use one electrical signal to control another."
This is exactly what we're doing in the temperature control circuit.
For a more in-depth view, I recommend the book "Microelectronic Circuit Design" by Richard C. Jaeger.
bye,
Tillmann |
By: obedey (IP: 220.245.178.*)
Written on: 28-08-2005 01:28
thankyou for your help, that article was a lot easier to understand than the ones i was finding. |
By: Carl Wong (IP: 71.106.186.*)
Written on: 10-10-2005 22:07
I have just built a temperature control as instructed on the website and I am testing it on the fan for my hard drive.
How does the temperature control work, exactly? Is it designed to maintain a specific temperature, the way a thermostat does, or is it designed to supply a higher voltage to the fan as the temperature goes up, so there is a increasing correlation between temperature and voltage?
Also, could circuitry be added so that the fan will always spin at a minimum speed that you select, and increase speed only when it goes over a set temperature?
Would there be a way to change the sensitivity of the device adding or changing components?
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