Hobby Electronics Basics

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alternating current

why the AC current or vaoltage is represented in rms values ,why DC current or voltage is represented so.
3 comments posted 18yrs
posted by selvanrocksu
3 comments posted 18yrs posted by selvanrocksu

5 x 7 dot matrix LCD display

Bought one of these for a couple $ today at my local parts depot. Has 14 pins on each side, and looks like a 3-1/2 or 4...
6 comments posted 18yrs
posted by db5151
6 comments posted 18yrs posted by db5151

rs232 question

I have a controller that talks rs232 ,driven by a MAX232. 3 wires only. I connect the computer to it: works fine. I am...
2 comments posted 18yrs
posted by fritzo2ster
2 comments posted 18yrs posted by fritzo2ster

filter capacitor sizing calcs

Let's say I've got a bridge rectifier downstream of a power transformer, and I want to calculate the size of filter cap...
14 comments posted 18yrs
posted by mrdarrett
14 comments posted 18yrs posted by mrdarrett

Laser safety question

I just started working on laser systems. We have a problem on a laser installation, it uses laser to transmit data acro...
1 comments posted 18yrs
posted by jerry
1 comments posted 18yrs posted by jerry

Controller help needed

Hello everyone. I have an array of 20x20 electrodes (a pcb with a matrix of 20x20 terminals) and I would like to be abl...
3 comments posted 18yrs
posted by Hlias.giannopoulos
3 comments posted 18yrs posted by Hlias.giannopoulos

Heatsink calculation with limited data

Hi, I am using a modified version of the lighting controller circuit at... http://www.edn.com/index.asp?layout=3Darticl...
3 comments posted 18yrs
posted by allanlewis99
3 comments posted 18yrs posted by allanlewis99

"coupled" Inductors

What are the components that are coils of wire that are used like an inductor but are wound on the same bobbin/core? I...
3 comments posted 18yrs
posted by Jon_Slaughter
3 comments posted 18yrs posted by Jon_Slaughter

Problem in autoscan FM radio

Dear group, I have this one-chip china-made auto-scan FM radio which has a problem. It has a "SCAN" and a "RESET" butto...
2 comments posted 18yrs
posted by allenbsf6502
2 comments posted 18yrs posted by allenbsf6502

high current voltage regulator?

Is there a version of the LM317 that works up to 10A? How about up to 5A? Michael
7 comments posted 18yrs
posted by mrdarrett
7 comments posted 18yrs posted by mrdarrett

Calculating the Voltage Drop of the LM386

Hi All How do I calculate the voltage drop of the LM386 IC? Do i simply make a measurement across the Vss pin and the Gr...
8 comments posted 18yrs
posted by shelton.dcruz
8 comments posted 18yrs posted by shelton.dcruz

Voltage ripple

I'm measuring the output ripple on my flyback (60 kHz @10W). I'm using 2 polymer aluminum caps 16V 470uf 9mohm 100 kHz...
1 comments posted 18yrs
posted by spamme
1 comments posted 18yrs posted by spamme

Wave Trap

I have an old tube regenerative radio, but where I live, there's a powerful radio station that overpowers the other wea...
2 comments posted 18yrs
posted by the1930s
2 comments posted 18yrs posted by the1930s