Simon
With great difficulty originally, but I worked it out in the end with help, as per this thread (username SAC);
2-way active crossover for AMP9basic
On my arrangement, the primary coils are wired in series, the secondaries in parallel. This I am told gives me 1:6.45. Both coils paralleled gives 1:12.9. The 12.9 gave me problems, perhaps because the preamp could not drive the impedance.
With great difficulty originally, but I worked it out in the end with help, as per this thread (username SAC);
2-way active crossover for AMP9basic
On my arrangement, the primary coils are wired in series, the secondaries in parallel. This I am told gives me 1:6.45. Both coils paralleled gives 1:12.9. The 12.9 gave me problems, perhaps because the preamp could not drive the impedance.
Thanks SAC
I like the idea of PLLXO, but adding an active buffer just seems to defeat the object to me. An input TX looks an interesting technique to give it a helping hand.
I like the idea of PLLXO, but adding an active buffer just seems to defeat the object to me. An input TX looks an interesting technique to give it a helping hand.
One thing I've wondered about that i read in this post:
Say you have 10 k input impedance on the amp and R2 equals 100k like in the case described above, is the insertion loss of ~ 11 db the only disadvantage or will the amp also have more distortion because of impedance issues?
I would ideally like to have a fourth order low pass PLLXO, my source has very low output impedance so in the end the last resistor R4 would only be ~ 3-4 times lager than my amp input impedance, which would present very acceptable insertion loss for me ( My source has abnormal output also, I'm at the moment using 20 db attenuators so ~ 6-11 db loss would be nothing 😛 ).
However if impedance issues generates additional distortion then I would have to add a buffer, but if I only lose some signal then I wouldn't need to bother which would be very nice 😀
Say you have 10 k input impedance on the amp and R2 equals 100k like in the case described above, is the insertion loss of ~ 11 db the only disadvantage or will the amp also have more distortion because of impedance issues?
I would ideally like to have a fourth order low pass PLLXO, my source has very low output impedance so in the end the last resistor R4 would only be ~ 3-4 times lager than my amp input impedance, which would present very acceptable insertion loss for me ( My source has abnormal output also, I'm at the moment using 20 db attenuators so ~ 6-11 db loss would be nothing 😛 ).
However if impedance issues generates additional distortion then I would have to add a buffer, but if I only lose some signal then I wouldn't need to bother which would be very nice 😀
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