85Views4Replies

Author Options:

Circuit Help Needed Answered

Hello, i need help with a project for school due in 3 months. And i  need help with a circuit with some odd requests. 

A variable resistor will change the voltage from 1-18v.  

From voltages 1-10v will heat up a peltier tile  and from voltages 11-18v will change polarity around causing the peltier tile to then cool down but at a faster rate. This all needs to be done without a switch and only with the  variable voltage. 

If 1-18v is not possible 1-12v may be even better. 
 
So voltages 1-10v will heat up a peltier tile and from voltages 11-12v will change polarity around causing the peltier tile to then cool down but at a faster rate. And again without a switch and only with the variable voltage. 

Thanks! -Jon-

Discussions

0
None
mpilchfamily

5 years ago

Hint: Look at the LM317.

Though you may need to find another direction here. Using a variable voltage to control a peltier is rather pointless and inefficient. Why would you want to flip functionality of a peltier with a voltage anyway? Are these requirements set by you or the teacher?

0
None
steveastroukmpilchfamily

Reply 5 years ago

How else do you do it ? Admittedly, you really want to control the current, but voltage works OK.

0
None
mpilchfamilysteveastrouk

Reply 5 years ago

He wants one range of voltages to make one side cool. Then he wants a higher range of voltages to reverse the current to the peltier so the cool side heats up. A toggle switch to allow the 12V to flow in one direction or another is much easier then using a microcontroller to since the higher voltage range and allow 12V to flow in the reverse direction.

0
None
steveastrouk

5 years ago

i need help with a project for school due in 3 months

That makes it a SCHOOL PROJECT and is therefore supposed to be YOUR work, not ours. We'll help, but you have to make the first move, or you are a cheat, and will deserve/may be thrown out of school.