- #1
Emreth
- 97
- 2
Hi,
I'm using a piezoelectric ceramic phono cartridge to produce high frequency displacements in the phono stylus. I'm driving it with a function generator that has an output of +-10 V sine wave . I connected the generator to a transformer that has a 1/10 reduction ratio to ramp up to voltage 10 times, and connected the output to the cartridge. I get about +-10 microns displacement at up to 5kHz but it's rapidly reduced to zero at 10kHz and higher. I need to get to 20-30 kHz. I get the same amount of displacement for lower frequencies so i don't think it's caused by the inertia of the stylus. Data for these cartridges claim that they can operate up to 20 kHz with a flat response (when the stylus is displaced by the record, it supposedly produces a signal which stays constant with changing frequency). I have a suspicion that it's a frequency dependent impedance problem either from the piezo elements in the cartridge or from the transformer itself. Any ideas on what the reason can be and how to fix it?
thanks
I'm using a piezoelectric ceramic phono cartridge to produce high frequency displacements in the phono stylus. I'm driving it with a function generator that has an output of +-10 V sine wave . I connected the generator to a transformer that has a 1/10 reduction ratio to ramp up to voltage 10 times, and connected the output to the cartridge. I get about +-10 microns displacement at up to 5kHz but it's rapidly reduced to zero at 10kHz and higher. I need to get to 20-30 kHz. I get the same amount of displacement for lower frequencies so i don't think it's caused by the inertia of the stylus. Data for these cartridges claim that they can operate up to 20 kHz with a flat response (when the stylus is displaced by the record, it supposedly produces a signal which stays constant with changing frequency). I have a suspicion that it's a frequency dependent impedance problem either from the piezo elements in the cartridge or from the transformer itself. Any ideas on what the reason can be and how to fix it?
thanks