I have to solve this circuit from linear technologies. I need the function of frequency depending on temperature.
Does anyone know how to start solving the circuit? Thanks in advance.

 

Hello,

Did you check the data sheet for the LM134? That is temperature sensitive so you can start there.

 

Interesting circuit, Lm134 is a current source but this current will depend on the temperature. And this 10nF capacitor together with an opamp for the integrator circuit. And those two complementary BJT's form a thyristor (SCR) structure to quickly discharge the capacitor. But how to determine the initial charging current I do not know. For sure we need to know the voltage across this adjustment potentiometers. The LM329 is a 6.9V Zener so the current through 6.2kΩ is around 1mA. But what port of this current will flow into 2k ADJ resistor I do not know yet.

 

Hello,

@Jony130 , Do the two transistors not make a PUT (Programmable Unijunction Transistor) ?
http://www.mycircuits9.com/2012/07/programmable-unijunction-transistor.html

Bertus

 

Thank you @Jony130 and @bertus , you have been very helpful, it looks like it an relaxation oscillator using a PUT to create a ramp waveform, I will keep investigating

 

@Jony130 , Do the two transistors not make a PUT (Programmable Unijunction Transistor) ?
http://www.mycircuits9.com/2012/07/programmable-unijunction-transistor.html

Yep, you're right, but for me this is a still SCR structure.