hi Lello,
This draft LTSpice sim is one option.
Uses 2 off HCNR for bi-polar isolation, CA3240 OPA's and a power amp push pull Class A output into a 200R Load.
Checked over a temperature range of 0C thru 100C, the BD's should have an heat sink.

E

Hi Eric,

Just one question on this design... How did you choose the value of the resistances R16 (100Ohm resistor at the output of the right op amp) and R14 and R15 of the transistors? (I have highlighted these in yellow).

Thank you very much for your time.

Lello

 

hi,
It's based on a similar technique used when driving say MOSFET's, if the power amp fails, it doesn't take out the driver, in this case the CA3140.
The 1R's help linearise the output by providing negative feedback.

E