http://www.esafono.it/RHODI.htm
in my website you can see the balanced CFP amplifier
based on GHG thesis --> Global Hide Gain
using big BJT drivers to compense different hFE
between PNP and NPN devices.
also see a natural DC protection with big balanced capacitors on output
in my website you can see the balanced CFP amplifier
based on GHG thesis --> Global Hide Gain
using big BJT drivers to compense different hFE
between PNP and NPN devices.
also see a natural DC protection with big balanced capacitors on output
Attachments
Hi AndrewT
you can see how the output bias voltage controller have ground resistors,
so the zero reference works.
Slow devices to drive 3pair of fast 200W 150degC devices:
is my GHG thesis.
Global Hide gain on CFP is a method to compense hFE difference
between PNP and NPN.
If you have the same ratio(hFE) in two stages,
the complessive (hide, because at last G=1) gain is the same in each rail, so same speed on each rail, natural sound.
Better way is use exactly the same devices (as final) for drivers,
but need to change radiator
you can see how the output bias voltage controller have ground resistors,
so the zero reference works.
Slow devices to drive 3pair of fast 200W 150degC devices:
is my GHG thesis.
Global Hide gain on CFP is a method to compense hFE difference
between PNP and NPN.
If you have the same ratio(hFE) in two stages,
the complessive (hide, because at last G=1) gain is the same in each rail, so same speed on each rail, natural sound.
Better way is use exactly the same devices (as final) for drivers,
but need to change radiator
Attachments
Re: Stee ....long Time To See You
on the other hand in topology like that may be that the 470R5W are sonic killers but also they work as VI limiters meaning that since this is PA amplifier you might be ok with it after all taking as a fact that in PA amplifier top of the quality or hi end quality is not the target .
Originally posted by darkfenriz
the "thermaly unstable output stage " is working like hell and dont have stability issues ...its been like that in similar topology that HILL uses in the chameleon amplifier "
also let us not forget that this is a PA amplifier and the topology is AB+B meaning that the thermal stability issues apply for the first stage AB ...the B stage will follow hapilly and produce eficiency of almost 65% and related quality of class B
this will make an excelent subwoofer amp ... ( see also original drawings at Ebay ) very powerfull , reliable , with low power demands and made to last for ever ....but still let us not forget it is still a class AB + B
regards sakis
sakis said:
darkfenriz said:
on the other hand in topology like that may be that the 470R5W are sonic killers but also they work as VI limiters meaning that since this is PA amplifier you might be ok with it after all taking as a fact that in PA amplifier top of the quality or hi end quality is not the target .
Originally posted by darkfenriz
the "thermaly unstable output stage " is working like hell and dont have stability issues ...its been like that in similar topology that HILL uses in the chameleon amplifier "
also let us not forget that this is a PA amplifier and the topology is AB+B meaning that the thermal stability issues apply for the first stage AB ...the B stage will follow hapilly and produce eficiency of almost 65% and related quality of class B
this will make an excelent subwoofer amp ... ( see also original drawings at Ebay ) very powerfull , reliable , with low power demands and made to last for ever ....but still let us not forget it is still a class AB + B
regards sakis
doyou think
that a product in e bay will have a proper schematic with it also ???? otherwise with a good picture of pcb and a schematic available anyone culd simply clone the litle monster in less than 30 min
i am pretty sure that looking at the schematic will have more mistakes
CBS240 said:Yup, it's bass ackwards.
How can you drive a BJT by it's collector? Some special transistor that is......
that a product in e bay will have a proper schematic with it also ???? otherwise with a good picture of pcb and a schematic available anyone culd simply clone the litle monster in less than 30 min
i am pretty sure that looking at the schematic will have more mistakes
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.