Hi everybody,
in the last months i have developed a 50 watt class AB power amp with the employment of complementary Sony V-Fet 2SK82 2SJ28. The input and driver circuit was thought to employ also low voltage power supply. Another my will was to configure the output stage to have also voltage gain, so the result was a topology similar to trans-nova.
Input stage is a folded cascode, driver stage is configured as a simply bjt follower to add up the complementary signals for the power stage. The little caps in the circuit not are much necessary, but in audio test with my friends, seems better with it in.
In reality i have prepared 2 main driver circuit: one with all j fet cascode and another with jfet-bjt cascode.
Distortion measurement tell me that the best was version B (all jfet), but in audio test my friends prefer version A (jfet-bjt). This last has a faster and cheerful sound with more mid-bass and the sound seems more out of speakers.
Version B is preferred if it's necessary to put in evidence especially the high or if you prefer a more relaxed sound.
Francesco.
in the last months i have developed a 50 watt class AB power amp with the employment of complementary Sony V-Fet 2SK82 2SJ28. The input and driver circuit was thought to employ also low voltage power supply. Another my will was to configure the output stage to have also voltage gain, so the result was a topology similar to trans-nova.
Input stage is a folded cascode, driver stage is configured as a simply bjt follower to add up the complementary signals for the power stage. The little caps in the circuit not are much necessary, but in audio test with my friends, seems better with it in.
In reality i have prepared 2 main driver circuit: one with all j fet cascode and another with jfet-bjt cascode.
Distortion measurement tell me that the best was version B (all jfet), but in audio test my friends prefer version A (jfet-bjt). This last has a faster and cheerful sound with more mid-bass and the sound seems more out of speakers.
Version B is preferred if it's necessary to put in evidence especially the high or if you prefer a more relaxed sound.
Francesco.