lol ok people everyone talking about electronics theory which is immense and complicated to understand especially when you have to understand a wave for is in 3d not 2d as scopes read them lol.
all the cos sin pi theta is all for working out angular sinusoidal waves etc. which is all boiling down to trigonometry when we look at the math but hey that is something you spend a lifetime studying so when trying to sort out your guitar all this is gobbled goope unless you got a few years to study all this AC circuits are far easier to understand that DC circuits so been as this question is for AC circuit it should be easy to understand.
AC has a frequency a wavelength which flows in a circuit which means it has a current because it flows and well it has a magnitude a level of power (amplitude) which means it has a level of voltage at a give point in time.
so very easy to understand frequency circuit is of course a flowing current standard flow through standard cables.
I seen many posts on this thread about frequency travelling through wires better in different materials this is very true but the human ear can only hear up to 25khz oops so all that is a waste of time the higher the frequency the more a cable will attenuate measure is in DB so take 1ghz you will notice problems using a standard single core copper wire for this frequency. gold on the other hand will improve the flow of this high frequency current but oh dear we can’t hear 1ghz lol.
gold plated and solid gold audio equipment including computer equipment use gold for one purpose only due to the fact these signals are so low and cable attenuation is negligible. and the reason they are gold is for corrosion (oxidisation) and oxidised connector will cause heavy attenuation not good to audio signals so cote it in gold and hey presto it makes a good connection and can be guaranteed.
for those who get confused with attenuation here is a explanation when your driving in your car at speed the wind is pushing you back and trying to slow you down if your engine stops you will eventually stop as there is no way you can keep it pushing against the apposing wind. this is what happens in any material such as copper which is a very good conductor I must add but life is not perfect and the current has allot of atoms to work its way through and with the opposing force will eventually drain its energy to the point nothing will come out the end of your cable lol. this is called attenuation an apposing force slowing the current flow down (resistance)
oxygen free copper strand audio cable is just as good as gold cable because it is manufactured to keep water and air out from the copper hence prolonging the life of the cable because oxidised copper increases in resistance as it ages. gold plated or solid gold/silver stranded core does the same thing and stop[s high resistance from forming later on down the line and is perfect for outside or mobile equipment use. obvious reasons the attack of moisture.
back to capacitors now due to complexity of the RC (resistor Capacitor) circuit we shall attempt to simplify for the purpose of sorting out your guitar etc.
without going into understanding working out the Voltage, Current, frequency, potential divider and kirchofs law we shall jump strait to a working way out of the issue.
Here is a formula>
Frequency = 1 / (2 x pi x R x C) work out the bracket formula always first if you remember your maths from school. brackets before division multiplication subtraction addition I think that is right lol.
anyway what this formula shows are that we can find out the fundamental frequency that is to pass through the RC circuit given we know values in the circuit. bear in mind this way of doing this is correct but because we are jumping allot of electronics theory we must respect that the formula is what it is. Don’t let this confuse you but Time over RC is very important if we try to work backward. this form of RC circuit is know as 3 different types they all contain a capacitor and a resistor and are know as low pass filters band pass filters and high pass filters very similar to a speaker crossover just a crossover uses inductor coils instead of resistors Butterworth crossover do have resistors but it is as I said above to much to go into right now and requires allot of theory study so be warned you need to set allot of learning time aside here is a good web site for this basic info.
http://en.wikipedia.org/wiki/RC_circuit
easiest way of doing this is to look at the most common used vales of capacitor and add the value into the formula same goes for the POTS.
capacitor used is o.22mfd 0.47mfd
pots are let say std 250kohm and 500kohm
don’t just slap these in formula we need to bring the values back into the form of ohm and farad.
hence 250kohm is > 250,000 ohm
0.22mfd is > 0.0000022 farad named after inventor of capacitor James faraday which is on the UK £20.00 note lol.
now lets get a calculator and enter 2 x pi x 250,000 x 0.0000022 and then while that answer is on the screen enter it into memory or store it or write it down then do 1 / the answer from your calculation above or memory return etc. bingo that is the frequency at 250kohm pot max that is what the capacitor resistor circuit will be fundamentally filtering out your tone.
do the same again and lower your resistance to say 10 ohm > 2 x pi x 10 x 0.0000022 again store or write it down the 1 / the answer then hey wow we have the frequency when the pot is just about turned all the way round the other way play with the Capacitor common values to get a desired frequency you want and go buy one hey also bare in mind changing form 500kohm pots to 1mohm 1 millionth ohm pot will mean you must again play with the capacitor to adjust the filtering fundamental frequency and yes 1 meg pot will make your range far grater than a 500kohm so if you want that hey very well I seen it done many times and I does work well.
understand more check the above webpage at goggles wikipedia site as well as this one here.
http://www.guitarelectronics.com/category/...asicwiringfaqs/
you can check this link to find common values too this is a very simplified explanation so please excuse if there is an are that may cause confusion but I am sure if I was to really go into the angular sinusoid frequency calculations you would be far more confused and loose allot more hair like me so I grew it long hopefully it will suffice to cover bold patches in the future especially when my capacitor finally runs out of charge lol.
hopefully this trial and error will atleast egt you started into looking into the RC circuit and have fun as well as learning the theory in a small nite size manour dont get scared at formulas understand them as rubish, a foreign language what you must do is understand what the circuit is actually doing and how the resistor and capacitor is doing the job the formula is only to work out the numbers again foreign language junk. if you know what the circuit is doing you will know what you are doing lol.
hope this answeres some questions on this thread i might start a new one for all this so you can freshen up on skills and or learn your skills people. thanks hope it helps.http://projectguitar.ibforums.com/style_images/1/folder_post_icons/icon9.gif
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