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Old 9th November 2012, 10:37 AM   #11
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If you have an amp meter on your power supply, you can set it as shown in the following demo.
http://www.bcae1.com/temp/ausettingbias.swf

If you don't have an amp meter on your supply, you can set it by measuring the DC voltage across the 0.1 ohm source resistors. 0.001v across the resistors should be OK.

Make sure that all transistors are tightly clamped to the heatsink before you attempt to set the bias.

IRF542 = IRF540 (that's what I've used, anyway).
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Old 9th November 2012, 11:01 AM   #12
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^ any chance Perry I could get a link to your source of the IRF-540 component ? I know of a supplier in the UK selling them for USD$14 ea but the shipping kills, much rather source the component locally.
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Old 9th November 2012, 11:39 AM   #13
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All of my sources would be in the US. I don't know what's available in Australia.
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Old 9th November 2012, 12:17 PM   #14
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^ IRF540n 130w are available here I assume these are = IRF 542 150w or "good enough". The power supply FYI worked perfectly @ +/-90V.
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Old 9th November 2012, 01:29 PM   #15
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The N version of the 540 causes problems in some Rockford amps. I'd order the non-N version.
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Old 9th November 2012, 06:38 PM   #16
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I have used the 540N's in many many Rockford amps with no issues. I would take Perry's advice and not order them though, this old beast can be temperamental. It would be a shame to cause more issues with using the "N" outputs.

Although I have put them in probably 40 or 50 amps and didnt have any issues, unless maybe I got lucky!!!
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Old 9th November 2012, 07:08 PM   #17
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^ I'll definitely look to get the non - N version.
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Old 9th November 2012, 10:41 PM   #18
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Quote:
Originally Posted by Perry Babin View Post
The N version of the 540 causes problems in some Rockford amps. I'd order the non-N version.
Id like to source the 540 version in the U.S is there any recommendations ? I found this see here
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Old 9th November 2012, 10:45 PM   #19
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I'd use Mouser or Digi-key.
IRF540PBF Vishay/Siliconix | Mouser
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Old 13th November 2012, 09:57 PM   #20
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All channels finally making sound. One small problem remains, there is a little dc offset on 2 channels. One channel is .1 v, another is .07v. The other two are below .03 which is ok. Any thoughts guys ?

However I loaded all channels down to 5 ohm and drove the amp right into clipping ( max output) and no problem. Nice and stable waveform on all channels.
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