Hi Apex,
For C1, C8, C9, C10, C11 it is also 50V or higher?
if we use max +/-75VDC, what is the minimum allowed(safe) for these caps rating?
Hi Reski,
well done
PCB size please?
Mine also has been changed(not tested yet), now its look more symmetric 😀
Regards
Here is a demo version, Demo versions you can not use "save,copy,cut" options in it but you can mark the surface that you want to save and use the "past" option in corel draw or other software in order to save it in a pdf,jpg or else. I use it when i need some simplier schematic or a pcb drawing.
@Mile
How much power i can achieve with dc +/-60v at 8R??
what is the minimum voltage to be applied?
what should be the biasing current for this type of amplifier so that i can estimate the size of heat sink?
Regards,
Jacob
How much power i can achieve with dc +/-60v at 8R??
what is the minimum voltage to be applied?
what should be the biasing current for this type of amplifier so that i can estimate the size of heat sink?
Regards,
Jacob
about 200watts assuming you keep that voltage constant, if your rails sag lower, about 150 watts is reasonable....
120W/8R with +/-60V, minimum rail voltage +/-35V, 30-50mA per pair of outputs is minimum bias or 150-200mA in rail.
Regards
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That gives a Vre range of 10 to 16.5mVdc
That seems a bit low for minimum crossover distortion (optimal ClassAB bias).
That seems a bit low for minimum crossover distortion (optimal ClassAB bias).
That means the output voltage is 30Vrms !!
where remaining 12v has gone?
why that much voltage is wasted in this amplifier?
Regards
Jacob
Yes, I have some amps, both single output pair and dual output pair, that can do 110W into 8r0 from quiescent supply rails sitting @ +-50.5Vdc
It's worse than lost 12V.
+-60Vdc supply rails and 120W into 8r0 is 43.82Vpk.
That's a lost >16V
+-60Vdc supply rails and 120W into 8r0 is 43.82Vpk.
That's a lost >16V
the truth is, all these talk about power ratings on paper is meaningless until an actual power testing can be done using a signal generator, a scope and 8ohm power resistor or dummy loads or a distortion meter....
WHY?
because we really do not know the quality of the power transformer you are using.....we can spec it but the actual dc resistances of the windings we do not know.....
open loaded rails sag big under load...
the Pioneer Spec2 rated at 200wpc into 8ohms has an unloaded rails of 92volts, at full power, rails sag to 71volts.....
WHY?
because we really do not know the quality of the power transformer you are using.....we can spec it but the actual dc resistances of the windings we do not know.....
open loaded rails sag big under load...
the Pioneer Spec2 rated at 200wpc into 8ohms has an unloaded rails of 92volts, at full power, rails sag to 71volts.....
to reach specification output of 56Vpk they start with quiescent supply rails @ ~+-90Vdc and when under full power they sag to +-71Vdc. That's a lost 34Volts.
That is such abominable performance that I would be asking for my money back because the amp is not fit for purpose.