MRF186 amp problem

[Electronically]

Try the chips nrg mentioned you'll be surprised at how well those chips work.youll find you'll have less issues if inserted into one of those boards. So forget about mrf186 and 9180.

Tru but can you named specify?
In one of hand I cant because if all good with match and tune working perfectly.. cost 35usd... in diy kit...

Transistor: MRFE6VP5150N.

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[rigmo]

130usd,,,, foe 150W forget... for 90$ you can get 500 600w

[Bton-FM]

130usd,,,, foe 150W forget... for 90$ you can get 500 600w

Mate what are you on about they are £30 on mouser?

[rigmo]

hi Guys.. more improvments today... MRF186 160W

[TGillies]

I wasted 3 of those MRF chips on the same board, tried both MRF9180 & MRF186. had the exact same problem as you at first, it would only give me reduced power before blowing altogether. i came to the conclusion it was the board itself.

viewtopic.php?f=11&t=2319&p=25632#p25632

gotta watch for some of these chinese parts, they can be very temperamental, yet other times solid... from my experience anyway.

[Electronically]

I wasted 3 of those MRF chips on the same board, tried both MRF9180 & MRF186. had the exact same problem as you at first, it would only give me reduced power before blowing altogether. i came to the conclusion it was the board itself.

viewtopic.php?f=11&t=2319&p=25632#p25632

gotta watch for some of these chinese parts, they can be very temperamental, yet other times solid... from my experience anyway.

What power supply was you using and amps.

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[rigmo]

I wasted 3 of those MRF chips on the same board, tried both MRF9180 & MRF186. had the exact same problem as you at first, it would only give me reduced power before blowing altogether. i came to the conclusion it was the board itself.

viewtopic.php?f=11&t=2319&p=25632#p25632

gotta watch for some of these Chinese parts, they can be very temperamental, yet other times solid... from my experience anyway.

Board is good for sure 100%... she can support 500w but values of capacitance is not right values for right matching.. i get efficiency over 70.5%
I will make measurements again.. with MRF810... i also burn two mosfet before i se where is problem ...

[Electronically]

I wasted 3 of those MRF chips on the same board, tried both MRF9180 & MRF186. had the exact same problem as you at first, it would only give me reduced power before blowing altogether. i came to the conclusion it was the board itself.

viewtopic.php?f=11&t=2319&p=25632#p25632

gotta watch for some of these Chinese parts, they can be very temperamental, yet other times solid... from my experience anyway.

Board is good for sure 100%... she can support 500w but values of capacitance is not right values for right matching.. i get efficiency over 70.5%
I will make measurements again.. with MRF810... i also burn two mosfet before i se where is problem ...

Change R1 r2 r3 for better results also

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[TGillies]

.[/quote]What power supply was you using and amps.

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[/quote]

12v psu built into the unit as purchased

[Electronically]

.

What power supply was you using and amps.

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[/quote]

12v psu built into the unit as purchased[/quote]14 amps christ, I'm no surprised that chipped popped often.

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[rigmo]

Change R1 r2 r3 for better results also

Hi Sir can you tell more info.. ? exact value?

[Electronically]

Change R1 r2 r3 for better results also

Hi Sir can you tell more info.. ? exact value?

R1 68 ohms r2 150 ohms r3 68 ohms

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[rigmo]

thank you ... i will try and, record
c4 c5? 1n 10n or?

[Electronically]

thank you ... i will try and, record
c4 c5? 1n 10n or?

Hmm unsure haven't went into detail yet if I do I'll let you know.

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[Electronically]

I have to say why does the Chinese boards not have any protection at the output chips ie mrf186 & 9180.would it not be sensible to put a zener diode onto the bias supply to protect the (expensive) transistor from too much bias voltage? .just a thought.

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[Bton-FM]

I have to say why does the Chinese boards not have any protection at the output chips ie mrf186 & 9180.would it not be sensible to put a zener diode onto the bias supply to protect the (expensive) transistor from too much bias voltage? .just a thought.

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Probably because they wanted to cut as many corners as possible to increase price margin.

[Electronically]

I have to say why does the Chinese boards not have any protection at the output chips ie mrf186 & 9180.would it not be sensible to put a zener diode onto the bias supply to protect the (expensive) transistor from too much bias voltage? .just a thought.

Sent from my AMN-LX9 using Tapatalk

Probably because they wanted to cut as many corners as possible to increase price margin.

Possibly so we keep blowing the chips as there market grows each time we keep buying.

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[Bton-FM]

I have to say why does the Chinese boards not have any protection at the output chips ie mrf186 & 9180.would it not be sensible to put a zener diode onto the bias supply to protect the (expensive) transistor from too much bias voltage? .just a thought.

Sent from my AMN-LX9 using Tapatalk

Probably because they wanted to cut as many corners as possible to increase price margin.

Possibly so we keep blowing the chips as there market grows each time we keep buying.

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genius

[Bton-FM]

Does anyone use any other capacitors than atc100b for amplifiers?I don't want to look like a cheap skate but is it really necessary to use these because they are quite expensive?

[rigmo]

atc100b is only trusted,... but blue ones 1kV 2kv... can handle on some level...