Tagged Questions
6
votes
3answers
130 views
Transistor Toggle Not Working
I'm trying to learn about how transistors work. As a simple test I created the following circuit:
My idea is that when the second transistor will keep the first one active after I click the button ...
3
votes
3answers
109 views
Controlling LED with microphone input
I know this is an extremely simple question, but I haven't been able to figure this out on my own. I'm trying to get an LED to get brighter as ambient sound rises. What I've come up with: use a ...
3
votes
4answers
285 views
Early Effect, Ebers-Moll, Common Emitter Resistance, reverse alpha/beta and saturation current
Ive been reading Sedra/Smith's Micro Electronic Circuits book, and it has a lot of info which I like, however I dont know how much of it is actually practial and useful, for instance it talks about ...
2
votes
1answer
767 views
What is Normalized DC Current Gain (as oppossed to DC Current gain)?
I have a table that presents DC Current Gain for BC548B transistor:
and a graph that presents Normalized DC Current Gain:
Are those two things related? What does "normalized" mean? Why is the ...
2
votes
2answers
2k views
What is the voltage divider rule?
Can anyone explain what the voltage divider rule is? How has the author of this book used it for analyzing the Voltage Divider Bias circuit for transistors?
And can anyone explain how the two ...
7
votes
2answers
4k views
How does an astable multivibrator LED blinking circuit work?
I am beginner to electronics. I come to know about oscillator using RC circuits (Capacitor charge and discharge and time constant tells the behavior of circuit).
Then I saw following circuit that ...
6
votes
4answers
615 views
Transistor with two voltage levels, Vb ≠ Vcc
Why is my transistor only driving 5V instead of 6V? How can I fix it?
I have a 6V, 25mA circuit running some LEDs. I can control them by connecting and disconnecting the positive terminal of ...
