A professional suggestion for those interested in improving sound. The circuit constitutes the part of input mixing console sound from the microphone or source of high level . It can be used on it's own or be multiplied to the number of channels required. It includes all the useful functions such as, phantom power , reverse face, signal attenuation for avoiding distortions from high level signals regulating channel gains and the rest of the stages will be added next stages ,for full mixing console. Attention must be paid to the quality of the materials used.
R1-2= 6.8K ohm / R16-19= 4.7Kohm / C8-11= 10uF25V electrolytic
R3= 56Kohm / R17-18= 15Kohm / C9-10= 47nF 63V MKT 5%
R4-6= 2.2Kohm / R20-21= 27Kohm / C12-13= 47nF 63V ΜΚΤ 5%
R5-7= 220 ohm / R22= 22Kohm / T1-2= BC560C
R8-9= 39Kohm / R23-24-25= 47Kohm / IC1= NE5532, TL072
R10-11= 2.7Kohm / C1-2= 33uF 63V electrolytic / S1-5= On/off Sw
R12-13= 4.7Kohm / C3-4= 680pf ceramic or mylar / JF1-2= 3 pin-connector
R14= 68 ohm / C6= 100uF 25V electrolytic /
R15= 10Kohm log. pot. / C5-7= 120pF ceramic or mylar / Αll Registor is 1% metal film
