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Old 13th June 2012, 05:39 PM   #631
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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
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Old 13th June 2012, 11:31 PM   #632
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Wall Photos | Facebook anyone have the pcb, please share, i want try this HYBRID....
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Old 14th June 2012, 06:22 AM   #633
comasus is offline comasus  India
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Quote:
Originally Posted by nazirdigi View Post
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
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Old 14th June 2012, 07:39 AM   #634
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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 wattaniya; 14th June 2012 at 07:44 AM.
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Old 15th June 2012, 08:43 AM   #635
comasus is offline comasus  India
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Quote:
Originally Posted by nazirdigi View Post
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
Attached Images
File Type: jpg APEX NE555 Protect Terminal.jpg (149.4 KB, 691 views)
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Old 15th June 2012, 05:31 PM   #636
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can u share some images. top and bottom pcb.
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Old 16th June 2012, 06:22 AM   #637
comasus is offline comasus  India
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Quote:
Originally Posted by nazirdigi View Post
can u share some images. top and bottom pcb.
It will take some time
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Old 25th June 2012, 06:37 PM   #638
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Quote:
Originally Posted by apexaudio View Post
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
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Old 25th June 2012, 06:51 PM   #639
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Quote:
Originally Posted by event horizon View Post
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
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Old 25th June 2012, 07:04 PM   #640
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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
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