# circuit to convert 30 mv to 5 v.

Discussion in 'The Projects Forum' started by Sankalpsood, Jan 29, 2016.

1. ### Sankalpsood Thread Starter New Member

Jan 19, 2016
9
0
people, i am trying to use thermo-electric cooler/generator to run a 5 volt dc motor. my problem is that the output of the TEG is as low as 30mv to 50mv. I know that an op amp can be used for the purpose but i need to confirm the ic number and the circuit please. I need to convert 30mv to 5 volt.
please tell me a circuit to complete this process. Or any other feasible method to do this.

2. ### Papabravo Expert

Feb 24, 2006
10,340
1,850
What you want to do is physically impossible. An opamp by itself will not produce the power required to run a motor. The power to run the motor has to come from an external power supply.

3. ### Sankalpsood Thread Starter New Member

Jan 19, 2016
9
0
thermoelectric fans have already been made. they are too using something or the other to do this function.

May 20, 2015
670
194
5. ### Papabravo Expert

Feb 24, 2006
10,340
1,850
The problem is that you are assuming you know how to do it. Tell me how much power you think you can extract from a 30mV signal. A couple of microwatts -- maybe. Not enough to run a fan.

6. ### atferrari AAC Fanatic!

Jan 6, 2004
2,664
784
Could you show a link to one you have precisely in mind?

7. ### Evanguy Member

Dec 21, 2014
81
8
Last edited: Jan 29, 2016
8. ### JWHassler Member

Sep 25, 2013
204
34
You might need to series a few of those to get enough voltage to run a boost-converter.
And maybe parallel a few to get enough power at the boosted voltage.
How much power does your motor require? That's your starting point .

9. ### Papabravo Expert

Feb 24, 2006
10,340
1,850
A boost converter will always have less power out than power in. Sometimes by a fairly wide margin. SMPS design is not for the faint of heart, and it is easy to make mistakes with smokey consequences.