I have a fan control circuit that currently works to infinitely adjust a 12V fans speed by using a reference voltage set by a pot (22.4K Max).
When running at low speed there is 0V across the pot and the fans receive 9.3V
As you adjust the pot to maximum the voltage increases until at maximum the pot has 2.8V across it, and the fans run at 11.6V
I want to turn this into an automatic temperature based control.
I have these two circuits (not sure which would be best to use) the first one is reverse engineered from a physical $2 Chinese fan controller that works pretty well.
The other diagram I found on the internet.
Both output 0-12V, but what I would like to do is modify one of them to output 0-3V, with a temperature range of 20*C to 50*C or 65*F to 120*F
Can this be done?
When running at low speed there is 0V across the pot and the fans receive 9.3V
As you adjust the pot to maximum the voltage increases until at maximum the pot has 2.8V across it, and the fans run at 11.6V
I want to turn this into an automatic temperature based control.
I have these two circuits (not sure which would be best to use) the first one is reverse engineered from a physical $2 Chinese fan controller that works pretty well.
The other diagram I found on the internet.
Both output 0-12V, but what I would like to do is modify one of them to output 0-3V, with a temperature range of 20*C to 50*C or 65*F to 120*F
Can this be done?
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