I have built a simple differentiator circuit that outputs rate of temperature rise as measured by a thermocouple. That circuit is working, but I have a need to calibrate it against a reference.
Ideally, I would like to be able to generate a reference sawtooth signal that smoothly ramps 5mV over 15 seconds (yes, a low, slow ramp).
My online searching so far suggests that 555-based oscillator, using a constant current source might be the way to go:
http://www.circuitstoday.com/saw-tooth-wave-generator-using-ne555
My present thinking is to then scale that output by around 1:1000 using an op amp with voltage divider and feedback loop?
Before I get too far along, I would really value suggestions from this group.
Thanks in advance.
Jim
Ideally, I would like to be able to generate a reference sawtooth signal that smoothly ramps 5mV over 15 seconds (yes, a low, slow ramp).
My online searching so far suggests that 555-based oscillator, using a constant current source might be the way to go:
http://www.circuitstoday.com/saw-tooth-wave-generator-using-ne555
My present thinking is to then scale that output by around 1:1000 using an op amp with voltage divider and feedback loop?
Before I get too far along, I would really value suggestions from this group.
Thanks in advance.
Jim