ne zadevaj ReVox - pretpostavka je da svak ko dodje na ovaj forum zna otprilike sta znaci taj zbir cifara , a vidi se i naslov threada ;elem , evo copy paste texta od T. Loesch-a :***************************************************Hi there,>You had spoke about building this preamp. Do you have a schematic available >for it? If so can you please send it if possible.Here is what I have. All ASCII I'm afraid....l'Audiophile MC Pre-Pre=======================Folks, with just few resistors, one JFET, one output cap you can build a step-up device. 12 Volts regulated or accumulator buffered supply | | 2k2 | |---------0.47uF-----out------------> | | (drain) |---in---------(gate)JFET 100k | (source) | 100R | | | 47R | | | |-ground--------------------------------------------------The basic topology is that of the second step-up amplifier by "Maison de L'Audiophile" of Paris/France.The first 100R is the cartridge load, which must be adapted for the cartridge you use. Using a paralleled 1nF cap also makes the circuit immune against RF noise. The 47R resistor in the source is not necessary, if the JFET has an IDSS(on) of 2mAmps or less.As the signals are very sensitive, the voltage must be very clean, a 100 000 uF electrolytic cap for blocking power supply noise, computer grade favourably, is advisable. Suitable JFETS are 2SK170, 2SK240 (double JFET), 2SK97 (double JFET), sorry only these japanese types are suitable, the European BC264 and BF254 and so on do not work here (I tried !).All resistors must be big metall resistors, e.g. Beyschlag 1Watt, or tantalum resistors. No carbon resistors allowed here, tubes addicts.The output cap is preferably polystyrene or polypropylene or paper-in-oil, as you like it, as they are different in sonic balance.Pacific RIAA Pre - 24V Version============================== o-----------------------------------o------------+24V | | R2 R6 | | | D---o---C7---o D---o---C1--R3--o--------o------o---G OUT o---o---G | | | S---o oIN | S---o R4 | R5 | | o | | | | | | | | | | o--o--o o--o--o | | | | R1 | | | | | | | | | | | | C2 C3 C4 C5 C6 | | | | | | | | | | | | | | o---o-------o--------o--o--o--o-----o---o-------o--------o--- 0VR1 = 100k C1 = 0.47 microR2 = 2.4k C2 = 15 nano (ideal C2 + C+ +C4 = 99.3 nF)R3 = 27k C3 = 15 nano well my copy says 100nFR4 = 3k C4 = 68 nanoR5 = 100k C5 = 22 nano here its 30nF totalR6 = 2.4k C6 = 6.8 nanoC7 = 2.2 microWe build the Pre using both the Fet Pre Pre and the Pacific. PSU is 3 X PP3 NIMH Recharables. The Pre Pre get's it's PSU via a dropper resistor and a 2,200uF Decoupling Cap (Black Gate or similar) so that 12V are supplied to the Pre-Pre.Later Thorsten **********************a evo i seme - 'nako (jer znam da ce ovaj ASCII iz texta biti necitlljiv):