I finally got all of Allards updates in....when I was finished I noticed that the audio output from the speaker was garbled and sounded off frequency. Changed speakers ( all 8 ohm units) no help....hummm.

So I suspected that 47 ohm resistor in series with the speaker or the sidetone wiring.....dropped that 47 ohm resistor to 22 ohms and all is well....got the volume back and nice audio...

all fixed....except I blew the IRF510 out.....

no "good fix" goes unpunished

Don KC1AT

What is the best way to troubleshoot a toroid? My receiver is occasionally dead until I tap #? toroid, then it "jumps" to life. It remains working unless I accidentally hit that toroid again. It has 6 legs, 3 on each side soldered to/through the board. If I contact/tap each of the legs, there is no effect, so I think the problem is somewhere within the actual twists and coils. Can it be caused by the coil contacting the core and shorting? I am tempted to add some super glue to the coils while it's working and hope it stabilizes and eliminates the problem.

Sent from Mike's iPad WA1MAD

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First, flux the connections and re-solder the connections.

Put the heat to it, maybe a bad solder joint or enamel was not all off the wire?

Just a guess?

The only other guess is that somewhere along a "Twist" something is shorting?

Mike, WA6ISP

What is the best way to troubleshoot a toroid? My receiver is occasionally dead until I tap #? toroid, then it "jumps" to life. It remains working unless I accidentally hit that toroid again. It has 6 legs, 3 on each side soldered to/through the board. If I contact/tap each of the legs, there is no effect, so I think the problem is somewhere within the actual twists and coils. Can it be caused by the coil contacting the core and shorting? I am tempted to add some super glue to the coils while it's working and hope it stabilizes and eliminates the problem. 

Sent from Mike's iPad WA1MAD

-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
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Mike@...

If fixing the connections does not help, the only thing to do
really is take it out and rewind the coil.

There is a lot of information around on how to do that. Watch out especially
for sharp edges on the ferrite toroid; they can and do short out the wiring sometimes.
You can file the edges, but it is a real chore. If the toroid is big enough, some wind it first with
tape to blunt the edges. That does little to the inductance and can help in avoiding
scraping the wire.

Use new wire -- the old wire is suspect. Usually something
around #24 magnet wire is what is used.

john
AD5YE