hi,i am Tobi from Germany.Advance,sorry for my bad Englisch .
i bought a defect Hifonics XX-Zeus class d mono Amp (1600 watts RMS) and repaired it.
in the output stage part 3 transistors had a short circuit.(Two IRF640N and one IRF9640).
the consequence was a blown power supply (eight IRFP064N plus the drivers 2SA1275)
a final test shows that the amp does not bring the full power.you can hear clipping
very early and the amperage to the amp is only 12 ampere at 4 ohm load in the
moment when the clipping begins.
so i made a test.the voltage from the amp-power supply is about +- 60 volts(so 120 volts)
at 12 volts input.
i connected a 1,4kw heater to the 120 volts.they remained nearly constant and the amperage to the amp was about 138 ampere.so i think the amp power supply is ok.
in the link below you can see a video where you can hear the clipping noise inside the amp,but without a connected speaker.input signal is 30 hz.
I increase the volume level until the clipping,then you can hear it.it comes from the four blue
capacitors.
in the other link you can see and hear with connected speaker.
why does this amp have not the full power?
Upload and Share Videos - Sendvid
http://sendvid.com/2fofkyni
i bought a defect Hifonics XX-Zeus class d mono Amp (1600 watts RMS) and repaired it.
in the output stage part 3 transistors had a short circuit.(Two IRF640N and one IRF9640).
the consequence was a blown power supply (eight IRFP064N plus the drivers 2SA1275)
a final test shows that the amp does not bring the full power.you can hear clipping
very early and the amperage to the amp is only 12 ampere at 4 ohm load in the
moment when the clipping begins.
so i made a test.the voltage from the amp-power supply is about +- 60 volts(so 120 volts)
at 12 volts input.
i connected a 1,4kw heater to the 120 volts.they remained nearly constant and the amperage to the amp was about 138 ampere.so i think the amp power supply is ok.
in the link below you can see a video where you can hear the clipping noise inside the amp,but without a connected speaker.input signal is 30 hz.
I increase the volume level until the clipping,then you can hear it.it comes from the four blue
capacitors.
in the other link you can see and hear with connected speaker.
why does this amp have not the full power?
Upload and Share Videos - Sendvid
http://sendvid.com/2fofkyni
Attachments
Last edited:
hi perry,thanks for the answer.
please lock at the attached pictures.
the GND of the oscilloscope,i connected with the minus of the external power supply.is that correct or do i need another GND-point
for this measurement?or can i measure with an multimeter too?on AC or DC?
on every gate-leg is a signal
please lock at the attached pictures.
the GND of the oscilloscope,i connected with the minus of the external power supply.is that correct or do i need another GND-point
for this measurement?or can i measure with an multimeter too?on AC or DC?
on every gate-leg is a signal
Attachments
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
- Home
- General Interest
- Car Audio
- Hifonics XX-Zeus has not the full power