tjolle62 Posted July 21, 2009 Report Share Posted July 21, 2009 In a few circuit diagrams i have they refer to a what seems to me is a transistorwith B C E as a overload protector and with number A16 and i have looked for a few hours on the net and i can't find anything on this little fellow,Anyone knows what I'm looking for and wanna share that info Please ....Come on !! 48 visits !! some one must know what it is !!! PNP is it also........... joeydennis11 and abelpratt 2 Quote Link to comment Share on other sites More sharing options...
tjolle62 Posted July 28, 2009 Author Report Share Posted July 28, 2009 At last i got a theori from a totally different place and he wasn't shure either buthe had a weak memory that it could be 1A16 and a PNP transistor but after severaldeep searches on the I-net it didn't make any kind of senses whatsoever ??? abelpratt and joeydennis11 2 Quote Link to comment Share on other sites More sharing options...
Hero999 Posted July 29, 2009 Report Share Posted July 29, 2009 It could be used as a switch, amplifier or (as you've said) part of a current limiting circuit.Bipolar transistors have so many applications that it's impossible to tell you what it's doing from what you've said. For example if I asked you "I've seen a flat head screw; what's it holding together?", how could you know the answer?If you post a picture I might be able to tell you but even then the only way is to post a schematic. joeydennis11 1 Quote Link to comment Share on other sites More sharing options...
tjolle62 Posted July 29, 2009 Author Report Share Posted July 29, 2009 Hello Hero and thnx for the reply in this matter !!That thing with the screw was great thou im a old auto tech and heard almost everything in that vicinity,,Im sorry if my question was incomplete but i submit a copy on this schematic now. Quote Link to comment Share on other sites More sharing options...
Hero999 Posted July 29, 2009 Report Share Posted July 29, 2009 Yes, it's being used as a current limiter.The 2N2955 is a booster transistor, when the voltage across the 50R resistor (or is it 60R? the schematic is too fuzzy) exceeds about 0.7V it turns on, allowing current to bypass the regulator.A16 is acting as a current limiter, when the across the 0.1R resistor exceeds 0.7V it turns on which pulls the base of the 2N2955 closer to the emitter, causing it to turn off.What output voltage do you want to get out of this?With a 9V transformer, the maximum output voltage is 5V.How much current do you want to draw?The transformer is rated to 2A but with the values shown, the current limit will be about 7A. Quote Link to comment Share on other sites More sharing options...
tjolle62 Posted July 29, 2009 Author Report Share Posted July 29, 2009 Now we getting somewhere !!In my mind i had a theory that if i wanna use for example a car battery as feed andit would be great if i could draw 5V - 3-5A out of this circuit.I'm sure that it is better solutions for this task out there but i got curious aboutthat A16 thing !!! Quote Link to comment Share on other sites More sharing options...
Hero999 Posted July 29, 2009 Report Share Posted July 29, 2009 Now we getting somewhere !!Yes, you'll nevery get any help until you give enough information.In my mind i had a theory that if i wanna use for example a car battery as feed andit would be great if i could draw 5V - 3-5A out of this circuit.I'm sure that it is better solutions for this task out there but i got curious aboutthat A16 thing !!!Yes, it will work although it's a very crude and inefficient solution, a switching regulator is better idea. Quote Link to comment Share on other sites More sharing options...
tjolle62 Posted July 29, 2009 Author Report Share Posted July 29, 2009 Sorry if my question was little fuzzy before but after 12 years my english has become a bit rusty !!like i wrote previous so was i more curious in this A16 - 1A16 model of pnp trans,just putting together a piggy back TIP2955 on a LM317 and it works great,Thank you Hero,//Kjell /Sweden. Quote Link to comment Share on other sites More sharing options...
Hero999 Posted July 29, 2009 Report Share Posted July 29, 2009 The lack of a schematic was a greater barrier to getting help than your poor English.I couldn't find much information about 1A16 on the Internet. I imagine that any PNP transistor rated to 1.5A will do. Quote Link to comment Share on other sites More sharing options...
tjolle62 Posted July 29, 2009 Author Report Share Posted July 29, 2009 About the same here regarding this 1A16But what i got is this2SA16.pdf Quote Link to comment Share on other sites More sharing options...
Hero999 Posted July 29, 2009 Report Share Posted July 29, 2009 It's not very good is it?If you can get hold of the 2SA16 then good for you but if you can replace it with a cheaper equivalent then all the better. Quote Link to comment Share on other sites More sharing options...
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