Hi, I had a BC547 NPN transistor laying around (datasheet: https://www.sparkfun.com/datasheets/Components/BC546.pdf) . Now I wanted to use is as a switch (following the schematic below). This works perfectly fine for an LED (exactly like in the schematic below). But I need to switch components= an i2C screen, a DS3213 module and a rotary encoder hooked up on the breadboard. So I just attached the emittor to ground, and attached the wire from the breadboard power rail that used to go to ground to the emitter of the transistor.
So now, all the components are in the place where the LED used to be.
But this doesn't work: but for some reason I get it to work after I(ve shorted the collector and the emitter for a second.
I've replaced the base resistor with a 220 Ohm one, which gies me 20mA base current for a 400mA current CE. That seems more than enough...
Anyone who can help me out here?