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.
Lower the rails to +/-70VDC and use minimum of 2 pairs of Mosfets in order to get 400W @ 4ohms.
..... acording to latest schematic posted here .......
regards Alex.
Hi Alex,
You are awesome!!! invaluable asset to DiyAudio
Routhun
regards Alex.
Hi Alex,
You are awesome!!! invaluable asset to DiyAudio
Routhun
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.
How i can produce -105v if i have just 64+64V transformer Thanks.
you need a separate winding on same trafo or use a small trafo with 0-15V, then Tie the +15 to -90V and gnd of small supply will become -105V, in other words it would be referenced to -90V dc rail
20.5 kg
2.5kg heatsink for one pair of o/p🙁🙁🙁That means heating is too much🙁🙁Why? 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 much🙁🙁Why? if it is rail to rail swinger then there should be less heat generations??
Any way still interesting for me.
thanks.
The heatsink i adviced is for 2 channels i.e. Stereo, using 2 modules. Total 800W power at moderate listening to high power blast.
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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 ...
okay ... I now live heat melt the solder and tin .... hehehey ...
mantabbbbz abizzz host ........ thanks
mantabbbbz abizzz host ........ thanks
Can someone give to PSU pcb layout Figure NVMOS? pls ---
to be honest, I was new and had a lot to learn, but I wanted to build it to the house PA.
master pls help me ........
to be honest, I was new and had a lot to learn, but I wanted to build it to the house PA.
master pls help me ........
NVMOS
Hi Workhorse
greetings just want to clarify .47 5watt .47 8 watt are these correct or both .47 should be 5 watt as shown on component layout on
alex mm pcb trying to build it
warm regards
andrew lebon
Hi Workhorse
greetings just want to clarify .47 5watt .47 8 watt are these correct or both .47 should be 5 watt as shown on component layout on
alex mm pcb trying to build it
warm regards
andrew lebon
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