How about series in 1 X 32 volts and 1 X 33 volts? Is 65 volts unacceptable?alexc said:Series - near as possible to 65 or so volts with 2x 32V or 2x33V zeners
the sidechain amp section is distorting, and you have some capacitive coupling between the drive path to the EL panel and the signal which goes to the opto.simonsez said:I thought i'm finished with this animal, but this afternoon i put it on analyzer, i saw a lot of harmonic dist. when i turn up peak reduction, with or without optical device (t4b). It's looks like it happen when grid V1 start to connect with grid V3 (peak red turn up). Any thought?
Thanks..
Simon.
drpat said:
EDIT: Replacing the neon lamp with a 60V zener diode (as advised by Keith in the post below) completely fixed the problem. It also tightened up the meter tracking. Voltage measured 61.8VDC across the zener when the meter was zeroed with R4.
simonsez said:After re-arrange a few wires, i can reduce the distortion.
simonsez said:I read that LA2A can have up to 0.5% THD!! That's huge isn't it?.
Dominant third I think is commonplace, and if the unit doesn't distort with NO T4 module fitted, and NO gain on the peak reduction control, your signal path is as clean as it will get.simonsez said:Below is the harmonic dist. in about 15db GR of my LA2A. Is this normal?
simonsez said:Distortion still leak in the signal path when i crank peak reduction (without T4)
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