Aug 11, 2016 #1 M mshh Full Member level 6 Joined May 30, 2010 Messages 349 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,296 Location usa Activity points 3,871 i have -0.5 volt (negative) and i want to use it to turn on pnp transistor and turn it off when the signal is 0.5 volt(positive) ?
i have -0.5 volt (negative) and i want to use it to turn on pnp transistor and turn it off when the signal is 0.5 volt(positive) ?
Aug 11, 2016 #2 KlausST Advanced Member level 7 Joined Apr 17, 2014 Messages 25,176 Helped 4,868 Reputation 9,757 Reaction score 5,541 Trophy points 1,393 Activity points 168,450 Hi, give +0.5V to the emitter of the BJT. And use a current liitng resistor at the base (10k?) Klaus
Aug 11, 2016 #3 crutschow Advanced Member level 6 Joined Feb 22, 2012 Messages 4,460 Helped 999 Reputation 1,996 Reaction score 1,123 Trophy points 1,393 Location Colorado USA Zulu -7 Activity points 25,287 0.5V is not enough to forward bias the base-emitter junction and turn on the transistor. What are you trying to switch with the transistor? What exactly are you trying to do?
0.5V is not enough to forward bias the base-emitter junction and turn on the transistor. What are you trying to switch with the transistor? What exactly are you trying to do?
Aug 11, 2016 #4 M mshh Full Member level 6 Joined May 30, 2010 Messages 349 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,296 Location usa Activity points 3,871 I want to convert the -0.5 volt to 20 volt. I thought that the transistor could be used to capture 20 volt if i supplied it with the same value. - - - Updated - - - KlausST said: Hi, give +0.5V to the emitter of the BJT. And use a current liitng resistor at the base (10k?) Klaus Click to expand... I want to take output 20 volts or at least +0.5 volt
I want to convert the -0.5 volt to 20 volt. I thought that the transistor could be used to capture 20 volt if i supplied it with the same value. - - - Updated - - - KlausST said: Hi, give +0.5V to the emitter of the BJT. And use a current liitng resistor at the base (10k?) Klaus Click to expand... I want to take output 20 volts or at least +0.5 volt
Aug 11, 2016 #5 KlausST Advanced Member level 7 Joined Apr 17, 2014 Messages 25,176 Helped 4,868 Reputation 9,757 Reaction score 5,541 Trophy points 1,393 Activity points 168,450 Hi, ... before you wanted to switch ON a PNP.. ... now you want to convert -0.5V to 20V ... without talking about current. Why a PNP? Why not use a comparator? What about power supplies? What about other devices? Maybe you should say what you really want...and give more informations... Klaus
Hi, ... before you wanted to switch ON a PNP.. ... now you want to convert -0.5V to 20V ... without talking about current. Why a PNP? Why not use a comparator? What about power supplies? What about other devices? Maybe you should say what you really want...and give more informations... Klaus
Aug 12, 2016 #6 crutschow Advanced Member level 6 Joined Feb 22, 2012 Messages 4,460 Helped 999 Reputation 1,996 Reaction score 1,123 Trophy points 1,393 Location Colorado USA Zulu -7 Activity points 25,287 Show us a diagram of exactly what you are trying to do. You explanation is not clear.