Originally posted by selamatg
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But it is too late for me. What I do is purchase about 30 of these transistors at a time since they are $1.00 each. I normally burn out about 5 a month from stupid mistakes. Since I have put case covers on my projects soldered and put electrical tape on all of my connections this rate has gone to about 3 per month because I try all sorts of combinations so with experimentation you are more likely to burn something. I found out that John Bedini burn MANY a transistor building his super monopole from reading material from the sites.
Here are some tips.
1. If ANY of your circuits are getting hot you have done something wrong. turn it off and check the wiring, or put more copper on the spools ( my mistake test the ohms of the coils). The coils need to match one another.
2. It is best to let the batteries do their thing and not play with them the longer they stay on the charger the better. There seems to be a "momentum of charge" that if you take the batteries off the charger, then they have to build back up to that level again.
3. If you are moving up in voltage move up the watts on your resistors / pots
You can save $ for resistors if you tear apart old TV's and look for the larger resistors then use your ohm meter to find the ones you need..
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ON Semiconductor Tra
15A, 80V, 83W NPN
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