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Old 11th July 2004, 04:41 AM   #1
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Location: Columbia, SC
Default Help biasing leach amp

Having a bit of trouble biasing my leach amp. I tested the power supply without it being connected to the amp and it is generating +57.8V on the positive rail and -57.8V on the negative rail. I then connected it to the amp using an 82Ohm 1/4w resistor in place of F2 and F4, they did not smoke and the voltage drop across the resistor was about 1.7V. I then connected the amp with actual fuses in F2 and F4, again, no smoking and everything appeared normal. Then I connected my amp meter across F2 with the fuse removed and with F4 still in place (as shown below). The amp meter doesn't show any amperage across the fuse, even when I move P1 around a little. I'm scared to push P1 too high because it might blow the output transistors, I think I must be doing something wrong if it shows no amperage what so ever, any advice would be much appreciated. Also, for those who read my other recent leach amp post, C25 and R50 and in place.

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Old 12th July 2004, 01:56 AM   #2
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Found the problem if anyone was interested. The fuse in my amp meter had blown .... =)
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