k brown
Well-known member
I tried replicating this Hi Cut filter from the Sony ECM-969 to use with other too-bright capsules, but when used with a different FET (and biasing values), it behaved like a drastic Hi Pass instead. I tried isolating it from the FET biasing circuit with a cap, but same results.
I'm guessing the behavior of the circuit depends on a specific source impedance from the preceding FET circuit (or I may have just bolloxed up the filter circuit itself); I.e. - the FET's 75k resistor is functioning also as a part of the filter?
Any suggestions how to modify this to a 'universal' circuit that can be used to experiment with taming bright capsules? The filter values would need to tinkered with to get the roll-off point to match the lift of a specific capsule, but need to get it to work first !
Thanks
I'm guessing the behavior of the circuit depends on a specific source impedance from the preceding FET circuit (or I may have just bolloxed up the filter circuit itself); I.e. - the FET's 75k resistor is functioning also as a part of the filter?
Any suggestions how to modify this to a 'universal' circuit that can be used to experiment with taming bright capsules? The filter values would need to tinkered with to get the roll-off point to match the lift of a specific capsule, but need to get it to work first !
Thanks
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