Tagged Questions
6
votes
6answers
389 views
Basic Electronics - I want to learn the “why”, not just the “how” [closed]
I have been looking for a very basic book on electronics, but many of them explain what the components do (and how they are made) and then go into designing circuits that do stuff. They tell you to ...
6
votes
3answers
226 views
How does this circuit diagram work?
I don't understand this circuit diagram here, but I'm sure that you can help me out.
I'll explain what I have figured out so far.
EDIT: It's a metronome circuit. Sorry for being unclear about that.
...
5
votes
4answers
277 views
Transistor Delay
I'm attempting to make an alarm for a freezer so that if the door gets left open, after 1 minute or so, an alarm will sound.
I've got something similar to the schematic below. When the switch is ...
2
votes
1answer
286 views
Mystery circuit: latching relay control with transitor / capacitor - why doesn't it work?
I've been looking for a way to control a latching relay with a microcontroller that doesn't quite have enough current on the output pins to operate it directly. I found this intriguing circuit using a ...
1
vote
1answer
71 views
Random-delay gen
Some years ago I tried to design a circuit where (among other things) a LED flashes after a kinda random delay. As it didn't work, (and after raging and destroying everything that could help me solve ...
4
votes
1answer
172 views
how to design a switch which works when an input of 0.10 is applied
i have an alarm clock , it's output voltage to the alarm buzzer is around 0.15 volt ,
i need to attach an electrical appliance to make it operate on scheduled time ,
for that i had used this circuit ...
3
votes
3answers
215 views
Polarized capacitors in common emitter amplifier
This is the basic common emitter amplifier.I have read that polarized capacitors should have proper polarity connected to terminals of DC voltage source and they may blow off if they are connected ...
1
vote
1answer
417 views
Bjt astable multivibrator questions
I'm working on a little project(an infrared jammer) and I'm having a few issues.
Why (and how) exactly do circuits like the one below use electrolytic capacitors? Wouldn't ceramic capacitors be ...
6
votes
2answers
355 views
Role of capacitor in this circuit
I have troubles understanding the role of C1 capacitor in the oscillating circuit from the schematic below:
My question is: what is the role of C1 in this circuit?
Is it to ensure that the circuit ...
6
votes
3answers
1k views
Simple transistor & capacitor circuit question
I'm new to electronics, so what I've found to be helpful to a good learning process is examples.
Now, I was studying transistors and capacitors, and as far as I could understand, a transistor acts ...
2
votes
3answers
642 views
How do I make this LED flasher more sensitive?
I'm making a circuit which will change brightness level of an LED in tune with music. So far, this is producing some results, but I'm not very satisfied with it:
If it matters, the forward voltage ...
2
votes
2answers
397 views
Explain this circuit?
This is one of the circuits in the Electronics 9/10 class.
The package did not explain how transistor combination worked and why the capacitor will reverse its current.
Can you explain this ...
11
votes
4answers
3k views
“Starter Kit for electronics” - What to buy?
I'm going to buy some things for back to the electronic world.
Starting with an Resistor Assorted Kit.
Need to buy some kits containing the most common capacitors and transistors... what to buy???
...
7
votes
3answers
664 views
Capacitor behavior in oscillating circuit
I've been making my way through "MAKE: Electronics: Learning Through Discovery", but have gotten stuck on Experiment 11, where I am making an oscillating circuit.
The book calls for a 2.2uF ...
