I was using the BC547 transistors that came with my official Arduino starter kit, I did a little bit of prototyping, creating AND and OR circuits, but then after a few months after I had made such projects like this, the transistors now turn on, with the base pin even, without the collector having any sort of power being applied to it.
Any fixes or why this is happening? Please help.
Then how do you know it's turning on?
Using LEDs, sorry for not mentioning it.
Are you saying it is turning on even if the base voltage is zero volts?
no, I checked the power with a multimeter it gives off a voltage of 0.7
no, I checked the power with a multimeter it gives off a voltage of 0.7
If the base is 0.7V then the transistor will be ON. It need to be less than 0.7 to be OFF
Can you show a diagram an photo of your circuit?
If the LED is turning on just by applying a signal to base then the transistor may be shorted b to e.
I've been using 220ohm resistors for the entire time but its still acting up and turning on
without the collector hooked on
like this without the collector
You have it connected wrong.
Do you understand the schematic I show in post #9
Oh, It is not like that at all, not that kind of schematic
reconnected it, seems to emit a small voltage, after leaving it running for a long time?
I reconnected the same circuit a lot of times, without the collector, now it seems to be stopping current from flowing?
Connect like this:
If IN is connected to GND, LED will be OFF
If IN is connected to 5V, LED will be ON
not sure why but, when I remake this circuit, after a few seconds the led light fades away, and then I have to reassemble it again, then it would turn on, the process just repeats
Circuit like I show with 220 ohm resistor ane 1K resistor?
stopped working just like the other ones. I will show you what kind of circuit im trying to use
