I realize this may be a simplified schematic but looking at this circuit I have a question about current flow. If I had the 10v supply turned on without turning on the + and - 15v supply would there be any chance of damaging the jfets and would there be any current flow ?
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No haven't built it yet but if i did I would use a matched pair of 2sj74 jfets in stead of the 2sj109 and at about $20 a pair i don't want to risk burning a pair up.
If you can get them, get some BF862 or something similar.
20 dollar gets you enough current production SMD parts to build a dozen of these circuits.
pretty closely matched BJT pairs can be found in BC847BS and the PNP BC857BS
PS: you can get the KC811 for the current mirror on the bottom, it shares the same pinout with MAT01
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If you cannot figure out that yourself, how can you design an amp like this?
well nothing happens, but when you switch the 15V rails that puny follower driving 2500pF of gate capacity will oscillate like crazy.
A short on the output will even blow the power fet for 100$.
Well you need another one for the 1.6A sink.