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Old 3rd November 2012, 09:45 PM   #11
dhamia is offline dhamia  United Kingdom
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I use a car battery fo power

How di I test the current draw i don't have a scope?
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Old 4th November 2012, 01:35 AM   #12
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You have to either use an amp meter or measure the DC voltage across a known resistance. It's not good to connect a standard multimeter to a circuit where you have an unknown current flow so measuring across a resistor (1-2 ohms, 25+ watt rating) is the safest option if your power supply doesn't have an amp meter.
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Old 4th November 2012, 03:51 AM   #13
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Well if you have one or more Irf 540's shorted then likely you have 1 or more 9540's shorted.

As I said replace ALL the outputs in that channel.
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Old 4th November 2012, 12:25 PM   #14
dhamia is offline dhamia  United Kingdom
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Thanks again for all the support on my thread,

On another note, which scope would you recommend
For a beginner to purchase and use for testing my amps?
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Old 4th November 2012, 10:34 PM   #15
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The reason that I suggested reinstalling the good FETs was to determine if there was additional damage or simply a shorted FET.

The gate resistors fail often enough to warrant checking them. IF one had failed and an FET was installed in that location, the FET would have failed immediately which could have caused confusion.

What is your budget for a scope?
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Old 5th November 2012, 12:22 AM   #16
dhamia is offline dhamia  United Kingdom
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Thanks Perry, my budget is 100
I will look to buy a used one.

Is there any particular spec I need to look out
For or are they pretty much all the same?
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Old 5th November 2012, 12:25 AM   #17
dhamia is offline dhamia  United Kingdom
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Will this do the job?


Velleman hps10. Personal Digital oscilloscope
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Old 5th November 2012, 06:18 AM   #18
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I'd suggest trying to find a used analog scope. The basic repair page of the site shows the display of a 2MHz scope and a 100MHz scope with one of the highest frequency signals that you're likely to see in a car amp. They are essentially identical.

I don't like the cheap LCD scopes. The resolution isn't good enough for critical audio work. An analog scope will show you if you have a tiny bit of distortion or a glitch in a drive signal. The LCD scopes don't generally have that type of resolution.

Post the used ones that you're considering before buying one.
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Old 5th November 2012, 09:27 AM   #19
dhamia is offline dhamia  United Kingdom
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Here is one in my town


Look at this on eBay:

Leader LS 1020 20Mhz Dual Beam Osciiloscope

http://bit.ly/SmWSrY
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Old 5th November 2012, 09:25 PM   #20
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That scope will do what you need it to do if it's in good working order.

You will need probes. These are decent probes for non-critical testing.
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