I was wondering how I would go about wiring two transistors in series.
I have a four coils pulse motor setup (would like to add four more coils).
But my transistors are getting to hot and burning up.
I put a 10 megaohm resister in between the emitter and the collector that seems to help alot but its still getting to hot.
I see some people are pitting a resister in between the base and emitter to.
Would that help me out to?
If any one has any ideas how to save the transistors from burning please let me know.
The transistors I'm using are 2n3055h and its a 12v setup.
Quotewas wondering how I would go about wiring two transistors in series.
I have a four coils pulse motor setup (would like to add four more coils).
But my transistors are getting to hot and burning up.
I put a 10 megaohm resister in between the emitter and the collector that seems to help alot but its still getting to hot.
I see some people are pitting a resister in between the base and emitter to.
Would that help me out to?
If any one has any ideas how to save the transistors from burning please let me know.
The transistors I'm using are 2n3055h and its a 12v setup.
Please post your schema
leo48
Possible use for transistor 2N3055 with coil
[IMG]http://img369.imageshack.us/img369/7186/scan0070uk0.jpg
leo48 (https://addons.mozilla.org/firefox/1174)
LOL Sorry about the crud picture.
Hey Slayer007,
Your 2N3055 is getting hot because you are putting a LOT of current through it. You can wire them in parallel, this will decrease the amount of current going through the first 2N3055. If you have 2 in parallel then each one will have half the current going through it. Another way do decrease the heat is to use a large TO-3 heatsink, and don't forget the heatsink grease. Or if you want to go down another path use a MOSFET with a low Rds on resistance. I have used the IRF series MOSFETs from International Rectifier with great success. The IRFZ44 MOSFET has a pulsed drain current of 192 Amps! Don't forget the heatsink, and heatsink grease...
Blessed Be Brother...
Thanks for your replies.
But I'm not really sure how to wire them parallel.
Could you please explane it a little more?
You connect both bases together, both collectors together and both emitters together. And them wire them to the rest of the circuit just the same a you have in your beautiful picture. Just like wiring caps or resistors in parallel. Leo48s picture has a reverse biased diode in parallel with the coil. He did this to prevent the back EMF (inductive kickback) from popping your 2N3055. In that configuration the Back EMF is shorted back into the coil preventing the energy from hitting the transistor.
Also notice that in Leo48s circuit he has his coil on the collector side of the 2N3055, that should work better too....
Fun with electrons, they are just playful little buggers....
Great thanks alot I'll give that a try.
Quote from: slayer007 on March 24, 2008, 02:23:50 PM
LOL Sorry about the crud picture.
This will not work this way.
the transistor is wired as an voltage follower (amplifying only the
base current (by 20 to 70 times).
This will not help . also if the base is connected to (+) via the reed swith) the transistor will not work
or aplify, because the fully current go from (-) to coil - to emitter to base to reed to (+) .
No (!!!) current will flow mor the collector way.
If you connect the LOAD (Coils) in the way : collector to (+) , you are in an better way...
Pese
Hey slayer 007
your problem is OK?
leo48
Follow the Circuit, Use also the Condensor (Mylar, Foil, Block or Tantalum / no Elko.)
between + and - , neares to the LOAD. So the Power will mot lossed in the "wirings"
and can better powering the Load resistance or Inductances).
-On low frequencies you will use 100uF and even more-
Back-EMF can be used against + or - supply voltage
Load must be in collector line.
The Inductances (Coil) will be switches (pulsed) at the fully supply voltage (less ~1 volt Vce(sat).
G.Pese
doubled. deleted
Thank you Pese
I will give this a try later today.