• Support PF! Buy your school textbooks, materials and every day products Here!

Differential Thermocouple Amp

  • Thread starter Ciani
  • Start date
  • #1
3
0
Hello, I would like to build a Voltage Amplifier, I did one with 2 Transistors but doesn´t work, it doesn´t amplify.
Do you know pleas how to build an Amplifier with transistors and resistors? an easy one with no more then 2 or 4 transistors please. Do you all think it´s possible?
Ciani
 

Answers and Replies

  • #2
NoTime
Science Advisor
Homework Helper
1,568
0
Welcome to PF.

Sounds like you want to build an amp out of separate components.
What do you know about hFE, biasing and perhaps negative feedback?

For some samples, you could try to google the subject -> one transistor amplifier
 
Last edited by a moderator:
  • #3
3
0
See "Voltamp.jpg" please. It doesn´t work, two wires of different materials, united at the one end, if you touch that point the voltmeter should amplify the 0,001 Volt that is caused by the different temp.

Don´t know your terms Notime, sorry, and transistor amp. with AC don´t wanna study. I am doing DC, stop.

Ciao.
 

Attachments

  • #4
berkeman
Mentor
56,664
6,560
I split these posts out of the old thread they were appended to, and started this new thread. I also moved the thread out of EE to here in the Homework Help forums.

Welcome to the PF, Ciani. That is a differential amplifier that should give you a differential output voltage that varies with the thermocouple temperature. What voltages do you measure at the various nodes in the circuit?
 
  • #5
3
0
Thanks a lot,
The circuit should measure 1 mV changes.
One of the two wires during transport has gone broken, transistors are type B547C but I don´t think it is relevant by such a circuit.

Ciao
 

Attachments

Last edited:
  • #6
NoTime
Science Advisor
Homework Helper
1,568
0
At this point, I'm not sure what your question is.
You can use the schematic you posted before as a guide to reconnect the wire.

Good luck.
 

Related Threads for: Differential Thermocouple Amp

  • Last Post
Replies
0
Views
8K
Replies
3
Views
493
Replies
2
Views
1K
Replies
0
Views
2K
Replies
2
Views
2K
  • Last Post
Replies
3
Views
1K
Replies
28
Views
5K
Replies
2
Views
2K
Top