900W H-class PA Amp with Limiter

[apexaudio]

hello sir mile,
greetings. when you say in parallel is it like this?

Yes, protect can be test with 18vac from protect psu transformer to PRO pin.

 

[Shelah]

hello sir mile, thanks for your reply. i will post my progress when i make it

 

[Shelah]

View attachment 290974
is this correct sir?
psu is 120-60-0-60-120 dc
i add h200 step driver for h900,
any change or replacement for this schema?

hello sir mile,
greetings. i would like to use this h-step on the hv23 mosfet amp. you said that for 4 pair outputs, you use 4 pair h step mosfet.
can i use 2 pairs irf540 for h step instead?
can i use h900 psu for the amp？
what va rating for transformer to use？
also any changes in terms of wattage to make to the h step resistors, capacitors and diodes.

 

[CIPRIANDRAGOS]

Anyone tested the H900 on the oscilloscope?

 

[apexaudio]

Anyone tested the H900 on the oscilloscope?

https://www.youtube.com/watch?v=yDeoWq8Cw7s

 

[Shelah]

hello sir mile,
am waiting for your reply sir.

 

[apexaudio]

hello sir mile,
greetings. i would like to use this h-step on the hv23 mosfet amp. you said that for 4 pair outputs, you use 4 pair h step mosfet.
can i use 2 pairs irf540 for h step instead?
can i use h900 psu for the amp？
what va rating for transformer to use？
also any changes in terms of wattage to make to the h step resistors, capacitors and diodes.

This h-step can't be use on nv23.

 

[Shelah]

hello sir mile,
greetings. i thought it can work because in the dc servo amp thread you said that the h step on the h200 city uld be used. anyway is there any h step you suggest to use?

 

[Aliaksandr]

mr. Mile, can you give me uv led and tone control pcb for H900

 

[Parag99]

HEATING PROBLEM

Pls somebudy help me my H900 get heating 2 much on normal clip & normal psu and on music signals
Heatsink getting 2 warm that nobody put hands for even 2 seconds

 

[sajti]

Pls somebudy help me my H900 get heating 2 much on normal clip & normal psu and on music signals
Heatsink getting 2 warm that nobody put hands for even 2 seconds

Do You have pictures about the amplifier? Maybe the heatsink too small, or the cooling fan is not powerful enough to cool down the amplifier.

Sajti

 

[Parag99]

psu 112-56-0-56-112 v dc

 

[AndrewT]

You MUST ensure that the air coming OUT of the fan passes through the fin gaps of the heatsinks.
You must provide an airtight tunnel and that tunnel must not allow air to bypass through the gap between the two sinks.

 

[AndrewT]

Para,
I do not understand the wiring for the 8 electrolytic capacitors.

 

[apexaudio]

psu 112-56-0-56-112 v dc

What is bias current on your amp?

 

[Parag99]

Mile sir
Re 0.33 e does not showing any voltage reading

 

[Parag99]

Offset is 0.7mv on both channals
And one more thing that higher rail bridge rectifier getting too warm at 4ohm load at normal clip

 

[apexaudio]

What is voltage on fuses (outputs colectors)?

 

[rohin]

Offset is 0.7mv on both channals
And one more thing that higher rail bridge rectifier getting too warm at 4ohm load at normal clip

why you don't fix mosfet with heatsink?check your mosfet.my h900 normal after half an hour even with small heat sink.

 

[apexaudio]

Look like H step not work... amp work with +/-112V rail in class AB and overheating.