Hi,
I created a circuit with a double buffer that should serve to drive low loads (in the simulated circuit with R4) but I have some problems and I would need a hand to solve.
Problem 1: coupling the two buffer stages distorts the amplitude. I tried to insert an interstage resistor of different values, but did not solve.
2nd problem: the two BD transistors fail to drive the 10ohm load.
I have assumed that the 3904 and 3906 fail to deliver enough current to drive the two BD139 and 140 .
The goal is to use this buffer that will be driven with an MPSH10 or if possible with a J-FET MPF102 without distortion. And the latter thing often happens to me when I pair several stages. I'd like to understand why. The input voltage of the buffer will be maximum sine 9volt but is the maximum. The two BD's are already in the LtSpice database, while of the 3904 and 3906 I'm not sure. I also attach the related model files if needed.
I have another request if possible. Is it possible to have an example schema for a buffer like this, but based on MOSFETs?
Thanks for the help!
I created a circuit with a double buffer that should serve to drive low loads (in the simulated circuit with R4) but I have some problems and I would need a hand to solve.
Problem 1: coupling the two buffer stages distorts the amplitude. I tried to insert an interstage resistor of different values, but did not solve.
2nd problem: the two BD transistors fail to drive the 10ohm load.
I have assumed that the 3904 and 3906 fail to deliver enough current to drive the two BD139 and 140 .
The goal is to use this buffer that will be driven with an MPSH10 or if possible with a J-FET MPF102 without distortion. And the latter thing often happens to me when I pair several stages. I'd like to understand why. The input voltage of the buffer will be maximum sine 9volt but is the maximum. The two BD's are already in the LtSpice database, while of the 3904 and 3906 I'm not sure. I also attach the related model files if needed.
I have another request if possible. Is it possible to have an example schema for a buffer like this, but based on MOSFETs?
Thanks for the help!
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