Staigen

Hi Logan Probably on the motherboard, else it is in a slot! Dont you see that, by looking at the rear side of your computer? The CPU is an IC ! //Staigen

Hi Ante If the speaker was powered when it happend, and maybee a few hours after that, i belive theres not gonna be more damage to it than there already is! //Staigen

Hi Logan Of course the computer have a soundcard, else you won't hear anything! The CPU dont have a soundcard! //Staigen

Hey Ante, dont you think he should do this simple test first, before dismantling anything? Probably it is the speakers amp or psu that is at fault, but you never know until you test. //Staigen

Ok, do the test i told you, than we know if it is the speaker or the soundcard! //Staigen

Hi Logan How is your speaker system connected to your computer? Via USB ? //Staigen

Hi Logan How is it powered? If it is a wallwart(or what the name for it is), then it can be that one that is at fault. Also try to turn up the volume to max, and take a screwdriver and touch the inputs, if there is some sound, it shall be some highpitched, 50 or 60 Hz hum, your speakers is probably not at fault. The input is the wire you connect to the computer(soundcard). Then it's probably your soundcard that is at fault. And that, i belive is at warranty. ;D ;D ;D //Staigen

Hi Um...Me123 No question is too dumb, dumbness is to not ask! ;D Now to your question! You didn't supply us with enough information to properly answer your question! How much current through the diode? That will determine the diode. Up to 1 Amp a 1N400x diode will fit nicely, up to 3 Amp a 1N540x diode will fit, for higher currents a diode at higer rating is needed. Look at datasheets, and search the internet! The x in above diode names is a figure between 1 and 7. Hey, the current from a battery can only flow in one direction, so maybee you dont need a diode, the diode will waste about 0.5 to 1 volt of your battery voltage! ;D If you supply us with more information we can give you a more accurate information! Staigen

Hi Fatal_Byte As Audioguru said the first two is probably that! ;D ;D The 3rd is 47uF/35Volt radial electrolytic cap the 4rth is a 6-35 pF trimmer cap Where did you found this, if you tell us, we can make an extra check! ;D //Staigen

Hi Diarmuid There are already some good books here on this site, E-Books(PDF-files, some are RARed)! Look at the "Articles" area at the top of this side! Ante have uploaded some too, look in the "Electronic Resources" area here in the forum! They dont cost you a lot! //Staigen

Hi Its not that simple, the question can't be answered that easy. It might work or it might not work! What is your antenna for instance? And how far is the radio stations? The power they transmit at? Your topology? Nothing can stand up against a good antenna arangement! You should start there, if you dont already have done that. The amplifier you linked to is the one that have the miller integrators. I belive the other two is better, but i am not sure. //Staigen

Hi The link dont work! //Staigen

Hi U stands for Voltage and I stands for Current, but Dont you think its time to read a beginner's book about elektronics first? //Staigen

Hi Diarmuid Then you have to learn Ohms Law! It goes like this:

Hi zefiris2K5 This pot, where did you found it, on some machine or something? The pic is not very clear, how many connections do it have, and where are they? Can it be some kind of RPM governor, that is worn out, if it's output is unstable? //Staigen

Hi What is Q? Quiescent? Usally Q means quality in electronics, used in resonant cirquits and filters! The inverse of Q is damping. The quiescent point depends on the output demands, if you need more than 1 mA out, than a quiescent current of 1 mA is a little bit low. Also, if you need an output peak to peak voltage of 10V, than a VCC of 9V is obviously not enough. //Staigen

Hi Hehe, so i am not able to answer this question, hehehehe But, there are 3 projects dealing with amplifying signals in the 86-108Mhz range at the RF Cirquits Projects side. One of them try to amplify these signals, using miller integrators, and i dont think that is a good design. Ok, i leave it, but it is not a promise Im not worried I belive everyone is allowed to post in every topic, and usally also are wlecome Simple? We dont even know wich of the amplifiers we shall discuss //Staigen

Hi kuwaiti badr, welcome to this forum, nice to have you here ;D Cant you read, it is a piezo speaker, used as a sensor here. The speaker comes from a piezo buzzer. I belive you can use the piezo ringer from a modern telephone as well, or an another piezo speaker. //Staigen

Hi there Usally you design a transistor stage based on its output demands, voltage, current, power. Then you decide what transistor to use. The emitter voltage is usally 5-10% of Vcc, but not always. //Staigen

Hi As i suggested, roughly! And what do you say pebe? Anyone else? //Staigen

Hi again Gn0stik Im not sure that this can produce enough current to light up a led, You have to try it, connect it to a rectifier bridge and connect that one to the led, to see if the led lit, if it does, you can also connect an electrolytic cap too, to get the led to lit for a longer time. Do you have MSN or ICQ or something like that, its easier and faster to communicate that way? //Staigen

Hi Edward When you start to rise the input from 2.5V the output is still at a saturated 0V, i havent calculated when the output start to rise! When the input voltage come near 5V the output saturate against 5V, i havent calculated that voltage either! //Staigen

Hi Edward Hehe, have you been lazy again, this must be totally wrong! When the input is 2.5 Volt, the output saturate at 0 Volt! When the input is 5 Volt, the output saturate at 5 Volt! And the scale between that is not linear! But the choice of op-amp seems to be exellent! ;D To windoze killa: Wich op-amp did you use when you simulated the cirquit? Did it have rail to rail output possibillitys? Did it have input common mode that include the positive rail? To pebe: What do you think? //Staigen

Hi A link would be nice! ??? So we are discussing the same project! //Staigen

Hi Gn0stik What is it that you have bought from DigiKey? All i get in the link you provided is an old pricelist from 2001, and on page 4 there is no second table! ??? ??? ??? No wonder you dont get any answer! Show us an accurate datasheet of what you bought, and i will look at it, but i cant promise you what to do. //Staigen