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Old 6th December 2011, 07:57 AM   #31
manina is offline manina  Germany
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No resistors on pin 2,3,15 ad the two MBRs voltages on the pins is now consistent; small variations but nothing significant.

When the MBR is off, there is anyway current on pin 1 of Q5 and this flow to pin2 then R13 and, consequently to the output. Does it make sense? At least from the circuit point of view. I would have expected no voltage at the output when it's off
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Old 6th December 2011, 01:34 PM   #32
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What's the voltage on pin 12 of IC1 with no remote voltage applied?

I'm assuming that the 'power' terminal is the remote terminal with no voltage applied and that you have nothing connected to the output except your voltmeter.
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Old 6th December 2011, 01:55 PM   #33
manina is offline manina  Germany
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Pin 12 with the remote disconnected is 0,25V

And, yes, only the meter is connected and "power" is the remote connection (the one that turn the MBR on when V is applied)
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Old 6th December 2011, 02:06 PM   #34
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Do you have a 12v headlamp or some other light load that you can connect across the outputs to see how much current will flow through it?
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Old 7th December 2011, 08:56 AM   #35
manina is offline manina  Germany
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Yes; I connected a small lamp to the "In" and the current draw is 0,36A while on the "Out" the draw is 0,30A

The light on the Out is faint compared to when it's connected to the In

Measurements done with the "power" disconnected.

When the power is connected, the draw is identical at 0,36A
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Old 7th December 2011, 02:20 PM   #36
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Connect the lamp to the output terminal and measure the DC voltage across each of the large resistors near the FETs. Does any one read above 0.000v DC?

If you can't read any voltage across the resistors, you may need a larger lamp (like an automotive headlamp).
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Old 10th December 2011, 09:32 AM   #37
manina is offline manina  Germany
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Quote:
Originally Posted by Perry Babin View Post
Connect the lamp to the output terminal and measure the DC voltage across each of the large resistors near the FETs. Does any one read above 0.000v DC?

If you can't read any voltage across the resistors, you may need a larger lamp (like an automotive headlamp).
I managed to find a 55/60W lamp from my car.

Connected and measured few resistors then one of the FETs (Q11) started to smoke . The resistor connected to the smoking one was at 0,25V while the others I measured were at 0V.

I stopped the test at this point
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Old 10th December 2011, 04:06 PM   #38
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Remove that FET and see if it still produces output while off.

In the future, you should have the FETs clamped to the heatsink whenever you have anything connected to the output terminals that causes current to flow out of the output.
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Old 10th December 2011, 06:05 PM   #39
manina is offline manina  Germany
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It was clamped

I'll take it off and see
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Old 11th December 2011, 01:54 PM   #40
manina is offline manina  Germany
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Few of the large resistors (on Q19 and Q17) are at 0,03V, few at 0,01 (Q13 ad Q15). Same also on the other side.
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