I think the C load on output a major issue (this with just 1u each C) :

I think an OpAmp that can handle C load good measure to carry out.
Dont know if you have seen these :
www.circuitstoday.com
The above have short circuit and thermal overload protection, which your approach has none of these capabilities.
Regards, Dana.

I think an OpAmp that can handle C load good measure to carry out.
Dont know if you have seen these :
LM317 LM337 Voltage Regulator Adjustable Filtering Power Supply AC/DC ±1.25-37V | eBay
Find many great new & used options and get the best deals for LM317 LM337 Voltage Regulator Adjustable Filtering Power Supply AC/DC ±1.25-37V at the best online prices at eBay! Free shipping for many products!
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Dual Adjustable/Variable Power Supply Circuit Using LM317 & LM337
Dual adjustable power supply circuit with diagram using IC LM 317 and LM 337. This variable power supply circuit has a range of 1.2 Volts to 30 Volts
www.circuitstoday.com
The above have short circuit and thermal overload protection, which your approach has none of these capabilities.
Regards, Dana.
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