I am building this VCO in an attempt to study it and I'm having trouble understanding the references section seen bellow.
I have used a KIA431 that I 'stole' from a broken switching power supply on the breadboard in place of the specified LM4041CZ-ADJ and it is giving me the +5V I was expecting. I am using the LM336Z-5.0 as a substitute in Multisim because I couldn't find a part model. Besides this, the rest of the circuit is quadruply checked to be as specified in the schematics and as seen in the Multisim snippet.
To make this as clear as possible, I need the following things: a) to know what this op amp/bjt configuration is meant to achieve and why a simple buffer (or amplifier with a gain of 2) wasn't used to acquire the +-10V reference b) the name of the bjt configurations c) why I am reading different voltages than what is specified (+-10V). I am reading +13.85V and -13.18V on the breadboard and +12V and -11.3V on the simulation
One thing that's also really bugging me to understand is that in both cases we see one diode drop difference between the positive and negative output voltages.
P.S. I am assuming that the only reason this op amp/BJT configuration is used is to feed the CA3280Es at the Tri to sine converter on page 6 of the linked PDF. I would appreciate a confirmation on my assumption (or the opposite) and a link to any resources that might help me get my head around this. (This is not part of the question in the title so it will not be considered in my answer acceptance.)