Hi all, This is my first post on this forum, horray!!
What i have been trying to do for a while is make a high powered H-Bridge, well actually 2 of them for a skid steer system, first a little tank and second a remote control wheel chair with out using the existing wheel chairs control box.
this is the circuit i started with and then changed the BC327 and BC337 for MJE2955T and MJE30. this got a fair bit more power but a lot more heat as well. I dont think the transistors are eithre on or off, more likely mostly on or off so i have been told
Sorry no circuit diagram for pic connection but that is pretty straight forward, instead of the inverter I connected it straight to my pic (pic16F84) and ran the whole thing off 5 volts
The pic program basicly changed the RC signal for 2 channels to 4 outputs high and low (because there are 2 h-bridges) so there is off forward and backwards for each channel, no speed settings. I can write the code for the speed settings but what i am after is which parts to replace the transistors with to get the output up high enough to drive a wheel chair motor with out using the controls on the wheel chair?
**broken link removed**
Will try to get full circuit diagram when i can, I believe one set of resistors is 380Ohm instead of 1k, with that i got more speed but didn't get too far past that.
Hope this isn't too much of a noobie request.
EDIT: Wow, there are alot of questions already for H-Bridges, perhaps something that might benefit the mass's is a a nice big transistor \ fet chart like in the back of the dick smith catalog so we can see what does what at what A's etc. Oh, and i am in Australia so basicly everything that i have to get will most likely come from china ><
What i have been trying to do for a while is make a high powered H-Bridge, well actually 2 of them for a skid steer system, first a little tank and second a remote control wheel chair with out using the existing wheel chairs control box.
this is the circuit i started with and then changed the BC327 and BC337 for MJE2955T and MJE30. this got a fair bit more power but a lot more heat as well. I dont think the transistors are eithre on or off, more likely mostly on or off so i have been told
Sorry no circuit diagram for pic connection but that is pretty straight forward, instead of the inverter I connected it straight to my pic (pic16F84) and ran the whole thing off 5 volts
The pic program basicly changed the RC signal for 2 channels to 4 outputs high and low (because there are 2 h-bridges) so there is off forward and backwards for each channel, no speed settings. I can write the code for the speed settings but what i am after is which parts to replace the transistors with to get the output up high enough to drive a wheel chair motor with out using the controls on the wheel chair?
**broken link removed**
Will try to get full circuit diagram when i can, I believe one set of resistors is 380Ohm instead of 1k, with that i got more speed but didn't get too far past that.
Hope this isn't too much of a noobie request.
EDIT: Wow, there are alot of questions already for H-Bridges, perhaps something that might benefit the mass's is a a nice big transistor \ fet chart like in the back of the dick smith catalog so we can see what does what at what A's etc. Oh, and i am in Australia so basicly everything that i have to get will most likely come from china ><
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