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Offline ImpulseTopic starter
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« on: February 13, 2016, 05:17:42 pm »
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Hi all,
      i have recently bought a barracuda kit and soldered all the components on to the board, now when i turn on the power the irf6940 gets really hot and makes a humming sound, i have looked for any direct shorts or components in the wrong way but there are non (i think  Embarrassed ) i have looked at the 2n2222a orientation but all seems ok. Is there any kind folk that could help me with my project?   



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« Reply #1 on: February 13, 2016, 05:30:25 pm »
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   Your Problem is most like the Damping of coil.  Or the Coil it's self.    Start there.

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« Last Edit: February 13, 2016, 05:31:54 pm by homefire » 		Logged
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« Reply #2 on: February 13, 2016, 05:53:56 pm »
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hi Homefire thanks for the quick reply! with the barracuda it is suppsed to 'beep' once the power is turned on i dont get this. I am very much new to this when you say coil damping (i do not have a coil made yet) do i need a resistor across the coil terminals to damp it?

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« Reply #3 on: February 13, 2016, 05:56:09 pm »
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How do you know for sure if any components are not in backwards? Are you familiar with the polarity marks on capacitors, diodes and the IRF defice itself?

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« Reply #4 on: February 13, 2016, 06:08:58 pm »
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hi golddigger1950 the board is very clearly marked in terms of orientation and the caps have the neg marked down one side.

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« Reply #5 on: February 13, 2016, 06:13:22 pm »
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Quote:Posted by Impulse
(i do not have a coil made yet)

Its not going to work without a coil.


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« Reply #6 on: February 13, 2016, 06:19:24 pm »
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i get that it will not work without a coil but the circuit does not turn on, the circuit should emit a tone even without a coil attached, if i add a coiled length of 0.5mm wire the irf9640 gets hot very quickly

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« Reply #7 on: February 13, 2016, 06:33:13 pm »
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Electrolytic caps have a negative marking but tantalums have a plus marking.

Would you post a photo of both sides so we can see if there is anything obvious? Use the highest resolution but keep the images under 500k in size or the forum won't allow you to post them.

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« Reply #8 on: February 13, 2016, 06:51:29 pm »
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hope this helps

Posted on: February 13, 2016, 06:50:24 pm
and this

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Offline GoldDigger1950
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« Reply #9 on: February 13, 2016, 07:50:37 pm »
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First glance, I see nothing wrong. Are all the transistors in their proper place?

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