Here are 3 small questions that made me "twiddle" in the last few days...
1) What is this thing found in most appliances connections before the plug? (see the attachment).
2) In a simple dc analysis of an NPN transistor connected in common emitter,
(E is connected to the ground), and we have only Rc and Rb. Current Ic = βIb, then Ic = β(Vcc-0.7)/Rb. Here is the question, isn't Ic related to Rc?! it seems to be not logical. I even tried it on Multisim with Rc in a potentiometer, as I changed the value of Rc, Ic changes obviously.
3) I searched a lot for an RF controlled switch circuit but I didn't find any. I need a simple one with a transmitter and a receiver which only task is to switch a relay when it detects the RF transmitted from the transmitter.
1) What is this thing found in most appliances connections before the plug? (see the attachment).
2) In a simple dc analysis of an NPN transistor connected in common emitter,
(E is connected to the ground), and we have only Rc and Rb. Current Ic = βIb, then Ic = β(Vcc-0.7)/Rb. Here is the question, isn't Ic related to Rc?! it seems to be not logical. I even tried it on Multisim with Rc in a potentiometer, as I changed the value of Rc, Ic changes obviously.
3) I searched a lot for an RF controlled switch circuit but I didn't find any. I need a simple one with a transmitter and a receiver which only task is to switch a relay when it detects the RF transmitted from the transmitter.
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