I dont quite know how to make a schematic, so i'll do my best to spell out the contents of the circuit.
The NE555 is setup to deliver a 10:1 Mark/Space Ratio to the base of an 2N3055HV transistor at 42 Kilohertz. I have the output of the 555 limited through a 10K resistor. The 3055 is driven off its own supply (its not pulling current through the 555), and the circuit shares a common ground. The input voltage to the circuit is between 12 and 16 volts (its going in a car). The 555 is working. I am getting voltage out of the 555. I can also light an LED by shorting the ouput of the resistor limited pin 3(output) and pin1(GND). (the multimeter read 11v... but i think the fact that its not a steady voltage might be messing with the multimeter and giving a short reading -unless there is a voltage drop within the 555). THe problem is... i cant get transistor to activate. I've looked at the data sheets for the 3055 and i know the minimum required base voltage is 1.5 volts. I havent been able to find anything for this so called high voltage version. I have verified that i have indeed connected the output of the 555 to the base of the TO-3 transistor. Is the frequency i selected too fast for this transistor? Am i not supplying it with the needed voltage? Should i use a different transistor? I am going to use this to drive an electrolysis cell. I dont want any comments on the fact that i am putting a browns gas generator in my car. That is not my question. Leave that science to me. (I have read some of the other posts dealing with electrolysis... they got waaaaaay off topic) Any suggestions/insights would be very helpful at this point.
Thanx in advance guys... (and gals)
~Vespian
The NE555 is setup to deliver a 10:1 Mark/Space Ratio to the base of an 2N3055HV transistor at 42 Kilohertz. I have the output of the 555 limited through a 10K resistor. The 3055 is driven off its own supply (its not pulling current through the 555), and the circuit shares a common ground. The input voltage to the circuit is between 12 and 16 volts (its going in a car). The 555 is working. I am getting voltage out of the 555. I can also light an LED by shorting the ouput of the resistor limited pin 3(output) and pin1(GND). (the multimeter read 11v... but i think the fact that its not a steady voltage might be messing with the multimeter and giving a short reading -unless there is a voltage drop within the 555). THe problem is... i cant get transistor to activate. I've looked at the data sheets for the 3055 and i know the minimum required base voltage is 1.5 volts. I havent been able to find anything for this so called high voltage version. I have verified that i have indeed connected the output of the 555 to the base of the TO-3 transistor. Is the frequency i selected too fast for this transistor? Am i not supplying it with the needed voltage? Should i use a different transistor? I am going to use this to drive an electrolysis cell. I dont want any comments on the fact that i am putting a browns gas generator in my car. That is not my question. Leave that science to me. (I have read some of the other posts dealing with electrolysis... they got waaaaaay off topic) Any suggestions/insights would be very helpful at this point.
Thanx in advance guys... (and gals)
~Vespian
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