Could this circuit be adapted to run on 65 V high rail and 35 V medium rail? I f yes, which are the components to re-calculate?
Can this circuit go as low as 2 Ohm with such 5 pairs?
Thanks
effebi
Can this circuit go as low as 2 Ohm with such 5 pairs?
Thanks
effebi
Use 1k2/2W instead 2k2/2W from MV to 15V zeners, and you can use 2R load with this rail.
Regards
If you refer to the resistor at 3.3K /1 W in post #116, that sounds ok, only for setting the correct bias current into the zener. Otherwise please tell me whis is the last/correct schematic.
Anyway, thanks a lot !😀😀😀
Your schematic is GREAT and I am going to use the output stage connected to something like a LME49810 as a VAS to make a sturdy rugged PA!
effebi
You can use separate +/-15V PSU (from protect board) and drop out resistors and zeners, in that case no need to set bias current for zeners with different rail voltages.
hi apex,
any pointers for me.what else i should do.
nothing seems to be wrong.i have tried connecting it directly
to ac mains as well.nothing goes wrong everthing normal
but my dc voltages sags from 60 to 22 and -60 to -14.
thanks
ravs
be a vegeterian....
any pointers for me.what else i should do.
nothing seems to be wrong.i have tried connecting it directly
to ac mains as well.nothing goes wrong everthing normal
but my dc voltages sags from 60 to 22 and -60 to -14.
thanks
ravs
be a vegeterian....
Rail voltage drop with useing serial bulb in primary is normal if current rise.
Regards
hi apex
even without a bulb.directly connected to ac mains.
ravs
be a vegeterian.....
For high voltage drop there must be high resistance in the circuit. Test your PSU without amp.
pls give me a layout of H900.. please
SEnd to my email.. dj_rh0meo@yahoo.com thank you..
SEnd to my email.. dj_rh0meo@yahoo.com thank you..
Last edited:
hello sir...
i use 18 X 18 vac for h 900 protect .
bt when fan on full speed
i have only 19vdc on fan pls help me for this..
thank u sir....
i use 18 X 18 vac for h 900 protect .
bt when fan on full speed
i have only 19vdc on fan pls help me for this..
thank u sir....
Apex-
Very nice of you to support so many builders!
The PSU has the voltages calculated wrong. before any other diodes and parts, the AC/DC will only BR to 112 and 56 - not 120 and 60...
BR = AC X 1.4 at 100% efficiency not X 1.5....
Silver,
A transformer does not give out a fixed voltage.
The secondary Vac depends on the mains supply voltage (primary Vac) and on the load current Iac.
The DC voltage from the PSU is not a fixed value, it wanders all over the place.
We can measure the worst case highest zero current PSU voltage. We and you will now know what the highest DC voltage you can ever get from the PSU.
Work down from that highest to find typical DC voltages.
hi apex,
i tried your darlington topology.and guess what everything was ok no abnormal
readings.no sagging of voltages. dc offset of 2mv.same reading on every collector.
then i switched back to normal driver stage with mje15032/33 .switched on
2.1mv dc offset.no voltage sagging everything normal.then i saw i forget to add
22ohm resistor which was connected to both emmiters of mje15032/33.as i
connect then every thing messes up.30 mv dc offset.voltages sags 60 to 38
and-60 to-14.different reading on every collector.what should i do.
thanks
ravs
be a vegeterian.....
i tried your darlington topology.and guess what everything was ok no abnormal
readings.no sagging of voltages. dc offset of 2mv.same reading on every collector.
then i switched back to normal driver stage with mje15032/33 .switched on
2.1mv dc offset.no voltage sagging everything normal.then i saw i forget to add
22ohm resistor which was connected to both emmiters of mje15032/33.as i
connect then every thing messes up.30 mv dc offset.voltages sags 60 to 38
and-60 to-14.different reading on every collector.what should i do.
thanks
ravs
be a vegeterian.....
Attachments
hello sir
i use triple ef stage vd 4 pairs...is that ok?vd triple ef stage what will happn??
thank u sir....
i use triple ef stage vd 4 pairs...is that ok?vd triple ef stage what will happn??
thank u sir....