@ramachandra i have also been looking at the kw series aswell... but they are hard to find on ebay (for me anyway) at 10000uf 50v same for the 4700uf 25v... maybe i need to search more :)
that control pod looks cool... very simple and effective design... my would be something like that but on the back of the plate... so then you just have to use rca's or jacks (have not decided yet... maybe both go in)... i like options... its just the only thing i can thing of using from isolationg one lot of wires from one point to another is relays or optos... i just dont know if the optos will add resistance to the wires and if it will have an adverse affect on the sound in the end... i will have to look some stuff up and some datasheets and see what i can find.
i might wait i might not hehe... depends how impatient i get because i want to try them... i did some measurements last night and i would have to move the resistors to the underside of the board and possibly the wires that connect the pre-amp to the main board... it would be a mod that i would do but only if i thought they made an improvement would i keep it this way... something i need to ask you... 3 things actually... i noticed in one of your mods you used polystyrene they maybe look like siemens 220nf... can i ask where did you source these from and how much? as these 220nf styroflex are quite hard to find... all the lower values are cheap but i cant use them anywhere in this project. also if i did buy those russian styroflex the case is metal and i have to run one of the leads down its side to connect to the board... will there be a problem if one of the leads touches the case of the capacitor? should i insulate down one side of the cap as i run the lead down it? these caps are very tall so staggering them from on side of the pcb to the other is not an option as there is not enough space on the back side of pre-amp board.... oh well.
i have noticed that the 220nf 630v axial i have used on the underside of the board (which is now on the top side going through) it creates a hum on the sub... if i move my finger closer to the plastic casing the hum gets worse until a peak when i touch the plastic... then if i touch the lead of that cap (or any 630v cap) or the plate the hum goes away? have any idea what i can do to sort this?
@andro6600 they are quite big which is making me look for others first before i actually purchase these ones.. if i can not get any others then i will mod these in... i know i can get them in re-arranging stuff just it wont look nice... but i will do it :) yes please let me know what you think about the sound with the polypropylenes as i might buy some of these aswell as they can go in either board i have while the others go in the other board i have... i am just not sure about the lead of the cap touching the cap case.
Something arrived today :) the 5 X opa1612 i dont know if i should get them in now or wait for my elna's to arrive and do it all at once... decisions decisions... i know i wont be able to wait haha...
i will most probably be buying more of these in the end... if any of you two know where i can get these cheaper than where i have bought them from i would be very interested in saving some money :)
heres the ones i bought...
here they are on my kitchen side :)
as polystyrenes are hard to find @ 220nf and a low voltage to fit in the pre-amp board... would there be any adverse effects if i used say a 240nf or a 270nf instead of a 220nf?
Edited by jayjayuk - 6/10/14 at 3:09am