Heres a true beginner circuit:
http://i.imgur.com/yLaRn.jpg
And no its not two transistors, its darlingtons like MJE703/803 or TIP142/147.
The two resistors sets the bias current, around 10-20mA is a good starting point, above that you need a bias compensation circuit.
http://i.imgur.com/yLaRn.jpg
And no its not two transistors, its darlingtons like MJE703/803 or TIP142/147.
The two resistors sets the bias current, around 10-20mA is a good starting point, above that you need a bias compensation circuit.
Yes the important part is you must make the opamp drive a constant load... then the output transistors follow the current being drawn by the opamp. Of course this only works with single opamps.
You might be surprised to find that this idea is actually used a fair bit, more refined than what you show here, but the same principle never the less. Usually it involves current mirrors which then drive the later stages, but the principle is the same.
You might be surprised to find that this idea is actually used a fair bit, more refined than what you show here, but the same principle never the less. Usually it involves current mirrors which then drive the later stages, but the principle is the same.
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