MOSFET Amplifier IRFP240/IRFP9240

[apexaudio]

output stage is powered with 2x63V and input stage with 2x70V

You must use same rail voltage for input stage or use diode for overdrive protection.

 

[apexaudio]

Hello Mile,
Could you explain working of circuit in post 383 so we can adapt it to other amplifiers? How is the overload/short circuit detected? What current?

Regards,
Victor

Over current detect circuit give positive DC voltage on PRO out if current is over 1,5A thru outputs (short circuit) or 10A (full power), C13 give time delay for peak current.

 

[wattaniya]

Hi apexsir,
can u share your PCB of HV350.2 with cut out protection in pdf format.
thank u.

 

[wattaniya]

hi apex sir,
which version is latest one?

 

[wattaniya]

hi apex sir,
see the image below, each image is different , so can u tell which version is this images.

 

[apexaudio]

hi apex sir,
see the image below, each image is different , so can u tell which version is this images.

On picture is first version HV350.

 

[djk]

"You must use same rail voltage for input stage or use diode for overdrive protection. "

Typical diode scheme (for hi-volt rails):

D5, 6, 7 and D8, 9, 10.

 

[apexaudio]

"You must use same rail voltage for input stage or use diode for overdrive protection. "

Typical diode scheme (for hi-volt rails):

D5, 6, 7 and D8, 9, 10.

Use only D7 and D10.

 

[AndrewT]

Or break the connection between B++ and B+, similarly B-- & B-.
Then none of the diodes are mandatory.

 

[wattaniya]

I can't find this files, I suggest HV23 with +/-75V rail and 4 pairs of IRFPs is OK.

hi apex sir,
can u share ur hv23 pcb in pdf.

 

[apexaudio]

hi apex sir,
can u share ur hv23 pcb in pdf.

 

[wattaniya]

hi apex sir,
i pointed 2.2k resistor place.
in hv23 image in that place one diode have, any mistakes?
if u can pls share ur hv25 pdf.

i think the latest pcb is hv350.2 am i correct sir?
if u can, pls share hv350v2 in pdf.
thank u for sharing ur hv23.

 

[djk]

"Use only D7 and D10."

With IRF type FETS, with BJT you need the other diodes.

"Then none of the diodes are mandatory. "

True, but recovery from clipping is better with the diodes.

 

[wattaniya]

hi apex sir,
i am editing the hv25.
is this correct sir?
only left side of hv25 i finished editing.
if u can, pls share the top layer of hv25

 

[wattaniya]

hi apex sir,
if u can,pls check for errors in hv25.

 

[Audioenthusiast2012]

Do you have a parts list for the schematic in post #1?

 

[wattaniya]

HI APEX SIR,
I FINISHED EDITING HV25.
CAN U CHECK THE PARTS ARE CORRECT?
I AM CONFUSE WITH THE TRANSISTORS ,(2N5401,2N5551,BC337,BC327) CAN U MARK THE NUMBERS OF THE TRANSITORS IN THE IMAGE,
WHICH DIODE IS IN THE PROTECTION LINE?

 

[apexaudio]

HV25

 

[alex mm]

nazirdigi , first no capitals , if you want an answer no ned to screem 🙄
Se picture below and will be clear .....🙂
Regards Alex.

 

[apexaudio]

Alex your pcb is HV23, all 2N5551 and BC337 must be replaced with 2SC2240.
2N5401 and BC327 must be replaced with 2SA970.
Thank for your pcb.
Regards