Hacking AC thermostat

skmdmasud

Member
Hi.
I have a situation where the AC temperature control unit is fixed to a specific temperature. I want to control the temperature to some degree. the temperature sensor used is a thermistor rated 1.5k at 22C. Can i place a 1k pot in series with the thermistor to change the temperature. Please suggest.


 
Assuming the thermistor is a NTC type, the pot in series should enable adjustment to a higher temperature, but not to a lower one. Is that what you want?
 
To complement Alec's reply, if you want to lower the temperature, then a pot in parallel with the thermistor will do the trick.
I would use a pot with a value at least 10X that of the thermistor. And put a fixed resistor in series with the pot, such that the total resistance value NEVER goes down to zero.
 
schmitt trigger said:
It will be a little hassle to fiddle with two controls, but yes you can.
Click to expand...
I mean a fixed resistor in parallel and pot in series. So that I will turn the pot to get desires temperature.
 
That would work too. What temperature range are you interested in?
 
If you did a few measurements we could figure out the optimum values. initially measure the resistance of the thermister at the fixed temp. Do the parallel combination at 20 and 30. 1/Rt=1/R1+1/R2....1/Rn for a parallel combination.
 
You must log in or register to reply here.

Similar threads

F
  • Question Question
W1290 Thermostat Low limit (P3) setting problem
Replies
1
Views
1K
aliarifat794
A
  • Question Question
AC Blower Motor Speed Control
Replies
4
Views
644
ahsrabrifat
A
V
  • Question Question
Selection Guidelines - Convert DC Wall Wart to AC Wall Wart
2
Replies
28
Views
1K
Nigel Goodwin
N
  • Question Question
Connector Polarity for AC signals
Replies
5
Views
2K
MrAl
M
O
  • Solved
AC flowing through the supply source of an amplifier
Replies
7
Views
2K
MrAl
M
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…