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TRANSISTOR SELECTION QUESTION

Started by magnetman12003, May 27, 2016, 05:02:03 PM

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magnetman12003

#5
May 31, 2016, 02:15:32 PM
Quote from: pomodoro on May 31, 2016, 04:50:44 AM
The base resistor, uses practically no power if you make it large enough.  Look for darlington NPN  power transistors to make it even less of an issue.  MOSFETS and IGBT are best avoided as they have a large capacitance which uses up some current. A TIP122 is a popular generic one one I use, 100V, 5A (8A Peak),current gain of 1000  beware of the the built in diode, it may not suit your needs. There are plenty of others which may be better for your design I don't know what your circuit is like.

Hi ,
So far my circuit is like what's in the below video. What other transistor arrangement should give me a lot more current and do away with the 5 watt power robbing resistor?  I noticed those that made this circuit complained about transistor overheating.  If I could get the second or pickup pancake to put out enough current to charge a 12 volt 1.2 AH battery I will have made a self runner using an additional charging circuit   Will post all after completed.  A small diagram would be a great help as I can put that together in a jiffy.

https://www.youtube.com/watch?v=4UmVLfFNx7U

pomodoro

#6
June 01, 2016, 04:43:09 AM
Looks like a blocking oscillator.  If the TIP35C has not blown up, then you can use a similar rating darlington. The 35C only has a gain of about 25.  Try a TIP150 with a gain >100 at high current. Handles 400V, =4x the TIP35C. Its a darlington without the built in protection diode, which I assume you don't want.  Use the same resistor, to check but then increase its value to the highest that works. If transistor heats up too much then its not getting enough current through the base to saturate and acts like a resistor.
I have not  built any of these so I'm just answering your generic question.
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