Cheapest way is to buy couple of power supplies like you already have.Thanks, could you send me a link to a dc bench generator that i could use for op amp circuits and that isnt too expensive?
You can combine them, for example, as ±15V and +5V or 3.3V and so.
https://www.amazon.com/s?k=lab+power+supply&crid=3126QMSYII8RS&sprefix=Laa+Power+Supply,aps,365&ref=nb_sb_ss_sc_1_16
More gain of opamp - more precision tuning:Interesting, I have the same circuit using LTSpice and it generates saturated semi-square wave after it stabilizes from power on. I used an OP777
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Your asc, tuned:Attached is my asc using OP07:
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