Hobby Electronics Basics

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Switch between different capacitor values

I have posted before about using a Maxim 281 Low pass Bessel filter. I need to be able to switch cutoff frequencies bet...
4 comments posted 20yrs
posted by amanderr
4 comments posted 20yrs posted by amanderr

What are they?

I have two 10mm diameter cylindrical cans about 10mm long. They are screened at one end and two pins at the other. They...
15 comments posted 20yrs
posted by dewhurst
15 comments posted 20yrs posted by dewhurst

Parts Identification for dimmer

I have a light (incandecent) dimmer that stopped dimming recently. eg. It will turn the lights on and off but not dim....
6 comments posted 20yrs
posted by stevesemple
6 comments posted 20yrs posted by stevesemple

Thevenin-equivalence

Greetings First, I'm sorry for this long post. I felt that if anyone is going to help me correcting my mind, I have to...
14 comments posted 20yrs
posted by bos
14 comments posted 20yrs posted by bos

choosing a suitable transistor

I need a transistor (used for switching, from 6v supply) that will power a maximum of 400mA. For now I'm using a TIP31...
8 comments posted 20yrs
posted by randomname12345
8 comments posted 20yrs posted by randomname12345

Speech in microcontroller

Hello, I would like ot know if anyone experimented with storing voices digitally in a microcontroller? I know there are...
18 comments posted 20yrs
posted by lerameur
18 comments posted 20yrs posted by lerameur

Warranty Stickers

I have developed a small unit which I am looking to sell to a few friends. I want to make sure they don't start playing...
10 comments posted 20yrs
posted by rob
10 comments posted 20yrs posted by rob

"Power" / "Wattage" question

Hi everybody. I have a question about "power" What is the significance of "power" in electronics? I know that its the v...
20 comments posted 20yrs
posted by string_fire
20 comments posted 20yrs posted by string_fire

Ultrasonic Sensor in a pipe

Dear friends: I have designed an ultrasonic range meter for measuring the surface of a liquid in a tank. the height of...
1 comments posted 20yrs
posted by sf_azimizadeh
1 comments posted 20yrs posted by sf_azimizadeh

powering an LED with a lithium 3 volt battery

I am very new to electronics and was wondering if anyone could help with the problem I am trying to solve. I want to ma...
3 comments posted 20yrs
posted by JJKarr
3 comments posted 20yrs posted by JJKarr

AC Wiring

Hello everyone, I'm doing some AC wiring, and I was wondering what the white powder-like substance is inside the main j...
6 comments posted 20yrs
posted by jonathan.ethier
6 comments posted 20yrs posted by jonathan.ethier

the laplace transform of a capacitor's equation

For a capacitor that is represented by a time-domain equation: v(t) =3D 1/C =E2=88=ABi(=CF=84)d=CF=84 + v(0), how do i...
3 comments posted 20yrs
posted by lobationtsai
3 comments posted 20yrs posted by lobationtsai