Hi,
I have an "old" Nicerizer 16 [SN 0053] thats humming [more than -70dB, no input signals at all, all knobs set in the middle, output level at 3/4] at 100 Hz.
Found that there is indeed a ripple [-66 dbV] after the L78S24CV regulator of the onboard PSU.
Supply Voltage Rejection is rated at 80dB for 100Hz on L78S00 series datasheet [but for only vi=10V vout=5V, while on nicerizer there are 24V],
so I assume that maybe there is something wrong here.
My plan is to try to change regulator, bridge, capacitors, or to move and maybe improve the PSU on a veroboard.
Curious to know if someone else has the same issue.
I'll update of course this thread when I'll have the problem solved.
I have an "old" Nicerizer 16 [SN 0053] thats humming [more than -70dB, no input signals at all, all knobs set in the middle, output level at 3/4] at 100 Hz.
Found that there is indeed a ripple [-66 dbV] after the L78S24CV regulator of the onboard PSU.
Supply Voltage Rejection is rated at 80dB for 100Hz on L78S00 series datasheet [but for only vi=10V vout=5V, while on nicerizer there are 24V],
so I assume that maybe there is something wrong here.
My plan is to try to change regulator, bridge, capacitors, or to move and maybe improve the PSU on a veroboard.
Curious to know if someone else has the same issue.
I'll update of course this thread when I'll have the problem solved.