MOSFET Amplifier IRFP240/IRFP9240 - Page 64

nazirdigi · 13th June 2012, 05:39 PM

hi comasus,
can u tell me how u check dc protect and thermal protect working or not, i already checked. but how u did?
what is the relay delay time when on and off.

can u post some images top and bottom pcb

suryadi5417 · 13th June 2012, 11:31 PM

Wall Photos | Facebook anyone have the pcb, please share, i want try this HYBRID....

comasus · 14th June 2012, 06:22 AM

Quote:

Originally Posted by nazirdigi

hi comasus,
can u tell me how u check dc protect and thermal protect working or not, i already checked. but how u did?
what is the relay delay time when on and off.

can u post some images top and bottom pcb

I have checked it by giving 2vdc by DMM
and used solder for ntc
turn on delay is not working
i have inserted in the speaker box with the amplifier so for the images i have to remove the cover again
expect turn on delay remaining is perfect so i have kept it inside confidently

nazirdigi · 07:44 AM

how u make the pcb? toner transfer method or silkscreen. which layout u followed.
u said turn on delay is not working. then why u put inside the speaker box, can u share some images. top and bottom pcb.

comasus · 15th June 2012, 08:43 AM

Quote:

Originally Posted by nazirdigi

how u make the pcb? toner transfer method or silkscreen. which layout u followed.
u said turn on delay is not working. then why u put inside the speaker box, can u share some images. top and bottom pcb.

Toner transfer
Followed attached image
I posted my problem but no help and compromised having dc protect
I put inside the speaker as the amplifier was fitted in it

nazirdigi · 15th June 2012, 05:31 PM

can u share some images. top and bottom pcb.

comasus · 16th June 2012, 06:22 AM

Quote:

Originally Posted by nazirdigi

can u share some images. top and bottom pcb.

It will take some time

SERGIODS · 25th June 2012, 06:37 PM

Quote:

Originally Posted by apexaudio

Simple Full Complementary Simetry +/-80V. Voltage amplifier/driver biased with 30mA. This driver circuit stabilized BIAS in output stage. Exelent stability without oscilation, hum and noise, sound great.
RMS Power: 240W 8ohm, 350W 4ohm

thanks for sharing projects

this a great

MOSFET amplification

mohsin0702051 · 25th June 2012, 06:51 PM

Quote:

Originally Posted by event horizon

If you had used Lateral Mosfets in the output stage then i guess you could get away with such a simple biasing scheme. Lateral Mosfets have a negative temperature coefficient so they'll tend to reduce quiescent current as they heat up.

IRFP240 & it's complement have a positive temp coefficient (until they are drawing many Amps of current) so they'll conduct more current as they heat up. There is no allowance for this in your circuit diagram, you'd need something similar to what is used in a transistorised output stage.

I might be wrong, but i don't think so

hello,i have an problem.i use microcontroller to switch mosfet(IRF840) in boost converter but when i connect the microcontroller its output decreasing thats why it cannot switch this mosfet.so how can i remove this loading problem,plz

mohsin0702051 · 25th June 2012, 07:04 PM

hello,i have an problem that to switch mosfet(IRF840) in boost converter by microcontroller .when i connect the microcontroller to mosfet thats the output of the microcontroller out put goes to 5v to 2.5 v(apporiximately) due to loading effect.how can i remove this loading problem.plz anyone

14th June 2012, 07:39 AM	#634
nazirdigi diyAudio Member Join Date: Oct 2009	how u make the pcb? toner transfer method or silkscreen. which layout u followed. u said turn on delay is not working. then why u put inside the speaker box, can u share some images. top and bottom pcb. Last edited by nazirdigi; 14th June 2012 at 07:44 AM.

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13th June 2012, 05:39 PM	#631
nazirdigi diyAudio Member Join Date: Oct 2009	hi comasus, can u tell me how u check dc protect and thermal protect working or not, i already checked. but how u did? what is the relay delay time when on and off. can u post some images top and bottom pcb

13th June 2012, 11:31 PM	#632
suryadi5417 diyAudio Member Join Date: Aug 2010 Location: jakarta	Wall Photos \| Facebook anyone have the pcb, please share, i want try this HYBRID....

15th June 2012, 05:31 PM	#636
nazirdigi diyAudio Member Join Date: Oct 2009	can u share some images. top and bottom pcb.

25th June 2012, 07:04 PM	#640
mohsin0702051 diyAudio Member Join Date: Jun 2012 Location: chittagong	hello,i have an problem that to switch mosfet(IRF840) in boost converter by microcontroller .when i connect the microcontroller to mosfet thats the output of the microcontroller out put goes to 5v to 2.5 v(apporiximately) due to loading effect.how can i remove this loading problem.plz anyone