Befaco Quad-T Manuals

Quad-T assembly manual: This module has four equal parts (four oscillators type twin-T), the drawing of the PCB is intentioned for an easy assembly procedure by symmetrizing two groups of oscillators taking the central axis by normal, and themselves symmetric around the line at 45º and 135º respectively. On this way once you find one component in one of the parts is easy to find his simile on the other tree portions. Finally in the middle we can find a transistor amplifier who can saturate the audio signal, on this way we can produce natural percussive sounds (avoiding saturation) or a more aggressive sounds by increase the level of the sum at the amplifier input. Part list: Resistors: Cant. Value Code Name on PCB 8 2K2 Red, red, red gold R3, R11, R50, R55, R8, R21, R40, R53 4 2M Red, black, gren, gold R9, R19, R42, R52 1 3K3 Orange, orange, red, gold R30 4 6K8 Blue, gray, red, gold R1, R22, R38, R60 4 10K Brown, black, orange, gold R6, R10, R51, R58 4 22K Red, red, orange, gold R14, R18, R43, R48 5 47K Yellow, purple, orange, gold R13, R29, R31, R32, R49 12 100K Brown, black, yellow, gold R5, R7, R15, R17, R24, R25, R36, R37, R45, R46, R54, R56 1 110K Brown, brown, black, orange, brown R33 4 270K Red, purple, yellow, gold R2, R12, R47, R59 1 470K Yellow, purple, yellow, gold R28 Pots: 4 5K 502 blue R16, R23, R39, R44 – multi-turn potentiometer 4 200K ó 100K 204 ó 104 white or black R20, R26, R34, R41 – 1 turn potentiometer Condensers: Cant. Value Code Name on PCB 1 560pF n56 or 561 C4 4 1uF 1uF C7, C8, C27, C28 (electrolytic check polarity before 2 2,2uF 2.2uF C17, C18 solder it, long leg = + ) 4 10nF 103 C6, C10, C25, C29 12 330nF 330n C5, C9, C11, C16, C19, C24, C26, C30 The ones labeled as: C1, C2, C3 - C13, C14, C15 - C20, C21, C22 - C32, C33, C34 (rounded by a white box) are the determinant of the tune of each sound, we will put here a PIN in order to choose the tune of them. Actives: 9 BC546A Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9 – transistor, put them according to the drawing on PCB 1 LED3MM D1 - LED diode, check polarity, long leg = +