Hey, I'll help do what I can but I don't have the expertise that you have and you are the designer.
Looks like we have the right transistors,maybe the IRFP250 might be marginal. I have some SJEP120R100 Semisouth that I can use for outputs.
Work on the feedback and VAS stages,the 33pf in the Vas stage could be lowered as long as the stabality is maintained. Just small changes can make a difference in ft.
I believe the totem pole drivers are adequate, if not could go to the MJE340 and MJE350.
This is just my thoughts.
Increase the rails to 120V. (for the APTs)
In fact I have some APT100M50J that I may try, Might as well let it all hang out. Might as well have some fireworks if the outputs go.
sam
Looks like we have the right transistors,maybe the IRFP250 might be marginal. I have some SJEP120R100 Semisouth that I can use for outputs.
Work on the feedback and VAS stages,the 33pf in the Vas stage could be lowered as long as the stabality is maintained. Just small changes can make a difference in ft.
I believe the totem pole drivers are adequate, if not could go to the MJE340 and MJE350.
This is just my thoughts.
Increase the rails to 120V. (for the APTs)
In fact I have some APT100M50J that I may try, Might as well let it all hang out. Might as well have some fireworks if the outputs go.
sam
This project is very basic and unique in its own way but i no longer have any interest to upgrade it. I just want to keep it sweet and simple for DIY atleast, so that builders can enjoy it.
I will only help with queries related to its setup, not tweaking with compensation for higher bandwidth.
You won't be needing MJEs for totems, because BCs are sufficient for that even with high gate capacitance mosfets.
I will only help with queries related to its setup, not tweaking with compensation for higher bandwidth.
You won't be needing MJEs for totems, because BCs are sufficient for that even with high gate capacitance mosfets.
hello Kanwar sir,
thanks for reply.Its a amazing amp by the means of its specifications,earlier i have seen this only in class d amps (one pair for such high output).Perhaps it due to rail to rail swing so there is no loss in the form of heat.
and one question more,What is to be done to drive 4 ohm load with this amp ?? lowering the supply voltage or adding one more pair?? my goal is to get something near 400 watts from this amp on 4 ohm load ?
Thanks again to you for giving such a innovative amp for diyers and Thanks to Alexmm for designing masterpiece pcbs for this amp.
thanks for reply.Its a amazing amp by the means of its specifications,earlier i have seen this only in class d amps (one pair for such high output).Perhaps it due to rail to rail swing so there is no loss in the form of heat.
and one question more,What is to be done to drive 4 ohm load with this amp ?? lowering the supply voltage or adding one more pair?? my goal is to get something near 400 watts from this amp on 4 ohm load ?
Thanks again to you for giving such a innovative amp for diyers and Thanks to Alexmm for designing masterpiece pcbs for this amp.
..... acording to latest schematic posted here .......
regards Alex.
Alex,
Now the pcb is OK, Thanxz for the support.
How i can produce -105v if i have just 64+64V transformer Thanks.
How i can produce -105v if i have just 64+64V transformer Thanks.
..... acording to latest schematic posted here .......
regards Alex.
How i can produce -105v if i have just 64+64V transformer Thanks.
20.5 kg
2.5kg heatsink for one pair of o/pThat means heating is too muchWhy? if it is rail to rail swinger then there should be less heat generations??
Any way still interesting for me.
thanks.
2.5kg heatsink for one pair of o/p
That means heating is too muchWhy? if it is rail to rail swinger then there should be less heat generations??Any way still interesting for me.
thanks.
PSU For This Amplifier
because to get a transformer 90vdc in my place is very difficult, only 75vdc or 55vac. I have 8 pieces IRFP250 and plans to make this power.
koch2 ho ta hay ...
Can describe the schema master? .... or there may be images PSU for this amplifier?
because to get a transformer 90vdc in my place is very difficult, only 75vdc or 55vac. I have 8 pieces IRFP250 and plans to make this power.
koch2 ho ta hay ...
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