This obviously a far bit more complex, but you can pick and choose elements if you like any ideas:
LTSpice gave me 0.015% distortion at 9V p-p. I would not expect it to be close to this in reality, but should still preform well.
I'v had good look with this CCS in terms of stability and seems to works well.
The JFET buffer make it easier to drive (input capacitance) and allows a smaller input cap to be used.
The AC feedback maybe a little much as 1000u output cap is more than enough into 150ohm not to roll off. But it does make it easier to set gain via R4.
Just thought I'd float some ideas around
LTSpice gave me 0.015% distortion at 9V p-p. I would not expect it to be close to this in reality, but should still preform well.
I'v had good look with this CCS in terms of stability and seems to works well.
The JFET buffer make it easier to drive (input capacitance) and allows a smaller input cap to be used.
The AC feedback maybe a little much as 1000u output cap is more than enough into 150ohm not to roll off. But it does make it easier to set gain via R4.
Just thought I'd float some ideas around
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Here is the latest version with Relay delay.
I tweaked and changed resistors.
There is higher gain to suit 300/600 Ohm headphones.
Higher gain means higher distortion, but it is still rather low for such simple circuit.
Yes, it drops right in.
There was a tiny bit more gain. And the output node was lower, 12.7V.
But distortion was somewhat higher, so I stick to IRF610 for this amplifier.
