Two circle schematic symbol on circulator

[Locrian99]

Evening all,

I’m about to start breadboarding the circulator schematic because my tayda order hasn’t shipped yet mainly and I figured I might as well try it before ordering the board but there’s a symbol I’ve never seen. After the op amp out there’s two circles where the lfo comes in. Looking it up it says it signifies current coming in. Do I just treat this like a normal connection point so run a jumper so that cap doesn’t meet at the same point?

 

[Robert]

Those are OTA stages.

You need an LM13600 / LM13700, you can't substitute them with a standard opamp.

The darlington pair transistors after each one are also part of those ICs, not discrete transistors.

 

[Locrian99]

Copy I got the lm13700. So just treat it as normal coming from the lfo?

 

[Locrian99]

I realized there’s a 1 there in that circle after looking at other spots. Makes way more sense now. Hard to see the 1 there…