thebadtall
Full Member level 6
Hello !
i came up with a great idea, as i was watching the usd/irr charts!
this idea is to make an automatic fan controller, wich consists of a lm317 :grin:
a 2k ntc connected to the heatsink and connected to adj of the ic and a 14v power supply.
for instance at 1892ohm with a 220 ohm adj out resistor it gives 12v out.
will it work? the ntc at normal temperature has 0 ohm? or it is 2k and when it heats reduces?
or i dont need ntc but something else?
also, i would like to use a bc547 or 557 since i got plenty, to turn on at a specific voltage , ie to turn on only between 8 and 9 volts , to warn about high temperature
thank you :-D
i came up with a great idea, as i was watching the usd/irr charts!
this idea is to make an automatic fan controller, wich consists of a lm317 :grin:
a 2k ntc connected to the heatsink and connected to adj of the ic and a 14v power supply.
for instance at 1892ohm with a 220 ohm adj out resistor it gives 12v out.
will it work? the ntc at normal temperature has 0 ohm? or it is 2k and when it heats reduces?
or i dont need ntc but something else?
also, i would like to use a bc547 or 557 since i got plenty, to turn on at a specific voltage , ie to turn on only between 8 and 9 volts , to warn about high temperature
thank you :-D