IRFP240/9240 Amplifier (simulated on TINA)

[xrk971]

There are four output devices ea with 80mA at 50v so 4 watts ea X 4 plus the drivers so probably 18w at idle and significantly more when playing music. Mine are warm but not too hot - can touch it for 10sec easily. Do you have photos of yours mounted on heatsink?

 

[PauloPT]

Here it is:

 

[vzaichenko]

Well, normally the heatsink is moderately warm at idle or relatively low listening volumes.
It will become considerably hot if you run a 50W sine wave constantly during, say, 30 minutes.
Paulo, you've got the good heatsinks - even a bit bigger than our reference ones.

 

[xrk971]

Yes those are nice fat heatsinks.

 

[jwilhelm]

My heat sinks barely break 40C after playing all day at moderate levels.

 

[PauloPT]

Well, also an option, but you loose accuracy a bit in this case. I prefer increasing R29, simply shifting the trimming threshold. This difference in the value required may be caused by some difference in the parts characteristics. Most likely - the red LEDs used by Paulo are giving a little bit higher reference voltage.

I'm using 1.8V leds. Is there an impact on the sound by using a little higher voltage drop leds?

 

[vzaichenko]

I'm using 1.8V leds. Is there an impact on the sound by using a little higher voltage drop leds?

Paulo, that's OK. We just had to correct the resistor value in bias spreader, but as soon as we've done that - no problem.

 

[PauloPT]

Paulo, that's OK. We just had to correct the resistor value in bias spreader, but as soon as we've done that - no problem.

Thanks!

 

[jwilhelm]

Canada Post is set to possibly go on strike on Wednesday, so if anyone is interested in VHex+ boards, supplies, parts kits, or any other boards, please let me know as soon as possible. Monday could be the last chance for me to ship boards for a reasonable cost for a while.

 

[sownel]

Greetings to all my vhex 1.1 in fitted diy case

 

[thimios]

Nice.
Please share all the SMPS files (schematic,pcb).

 

[sownel]

Nice.
Please share all the SMPS files (schematic,pcb).

Sir thimios attached pcb file download in other site
The ferrite transformer used is the EI33 , can be found in side burning soures ATX computer(dcrap) andre used.
The primary consists of 40turns of 22 AWG wire(only1wire)and the secondary consists of8+8 turns of 19AWG wire(2wires together in parrallel.
I get in 35v dc

 

[gaborbela]

Online Get Cheap Ei33 Core -Aliexpress.com | Alibaba Group

 

[vzaichenko]

Greetings to all my vhex 1.1 in fitted diy case

Nice build! I see a digital player embedded on the right.
So, this is a media center then

 

[thimios]

Sir thimios attached pcb file download in other site
The ferrite transformer used is the EI33 , can be found in side burning soures ATX computer(dcrap) andre used.
The primary consists of 40turns of 22 AWG wire(only1wire)and the secondary consists of8+8 turns of 19AWG wire(2wires together in parrallel.
I get in 35v dc

Is it the schematic available?
Can you give details about transformer?

 

[thimios]

Hi Sownel,can you give some details about transformer winding?
If you have the schematic diagram please post this here.

 

[thimios]

Hi Sownel,can you give some details about transformer winding?
If you have the schematic diagram please post this here.

nothing?

 

[Mosquito]

Sir thimios attached pcb file download in other site
The ferrite transformer used is the EI33 , can be found in side burning soures ATX computer(dcrap) andre used.
The primary consists of 40turns of 22 AWG wire(only1wire)and the secondary consists of8+8 turns of 19AWG wire(2wires together in parrallel.
I get in 35v dc

I vaguely remember this SMPS from another thread in this very forum, a Brazilian amp design using this PSU (hence the portugese file names)

 

[vzaichenko]

More IRFP240/9240?

Came up with an update - super-balanced, less distortion front-end here:
DiagoHex+

It's a single-LTP, but push-pull current-driven VAS.
A single-layer one-output-pair PCB will easily fit the size of original VHex one, developed by Albert some time ago.

 

[xrk971]

Ok, I am waiting with great anticipation someone versed in layout design to make Diagohex Gerber