555 and OP Amp Compose V/F PT100 – ISIS Simulation

Want to be a temperature controller for the oven, the temperature may be 300 degrees. I would like to use pt100 to measure the temperature, like 555 and op amp compose V / F, made with the ISIS simulation. It’s feasible, and share special pass up .

V / F Principle:
Integral circuit voltage generated by the trigger 555 (take 2 feet), so that the output produced 555 high (3 feet), 555 feet to the op amp 3-phase side, the op amp output voltage goes high, and began to record 555 , note the time to (charging capacitor is fully charged), 555 6-pin into a high, 555 trigger, 3 feet into a low, 7 feet into a low, pulled down 6 feet, 555 feet 3 goes low after to the end of the op amp for the same low, the op amp output voltage gradient is low, less than 555 when the trigger voltage of 2 feet, 3 feet and 555 are triggered, and then into the next cycle.

Integrator output voltage and input voltage and capacitance on the size of the input voltage is not about the output voltage down to 555 when the trigger is not the same with the voltage, which results in 555 of the output frequency is not the same.



555 Description:
2 feet low (<1 / 3 V +>) 3 feet high when
6 feet high electrical Run (> 2 / 3 V +) is low when the pin 3
7 feet and 6 feet shorter then normal, to 3 feet in the low post, down 6 feet, 7 feet high and 3 feet for the disconnect, the 3 pin is low, and turn it on

Supplement:
1. ISIS simulation, always prompt step time small, can be changed under the 555 resistance or capacitance value of the time, let time slow down
2. 555 including ne555, se555, sa555.
Source: http://www.partsparty.com/index.php/555-and-op-amp-compose-vf-pt100-isis-simulation/