Veronica Limiter/Compressor Parts List -------------------------------------- Resistors --------- R1 47 R2 270K R3 27K * R4 3.9K R5 3.9K R6 10K R7 1K R8 1K R9 56K R10 2.2K R11 3.3K R12 100K R13 47 R14 47K R15 39K R16 4.7K R17 4.7K R18 68 R19 47 R20 47 R21 270 R22 4.7K R23 4.7K R24 4.7K R25 270 R26 33K R27 1.5K R28 680K R29 2M R30 1K R31 1K R32 4.7K R33 1.5K R34 2.2K R35 39K R36 680 R37 680 R38 680 R39 22K R40 10K R41 1K R42 100K R43 3.9K R44 2.2K R45 33 R46 4.7K VR1 2.2K Variable resistor Capacitors (in picofarad except where indicated) ---------- C1 1000 C2 1000 C3 220 uf electrolytic 16v C4 100 C5 1 uf electrolytic 63v C6 1800 * C7 10 uf electrolytic 16v C8 100 C9 0.1 uf C10 10 uf electrolytic 16v C11 10000 C12 100 C13 1000 C14 220 uf electrolytic 16v C15 1000 C16 1000 C17 0.68 uf C18 10 uf electrolytic 16v C19 1 uf electrolytic 63v C20 100 C21 220 uf electrolytic 16v C22 1000 uf electrolytic 6.3v C23 1000 C24 220 uf electrolytic 16v Diodes ------ D1 1N5402 D2 1N4148 D3 1N4148 D4 1N4148 D5 1N4148 ZD1 1N5346 LED1 5mm Green LED2 5mm Green LED3 5mm Green Transistors / IC's ------------------ TR1 BC548 TR2 BC548 TR3 2N3819 IC1 TL074 IC2 TL074 Misc / Hardware --------------- FB1 2 turn ferrite bead FB2 2 turn ferrite bead FB3 2 turn ferrite bead FB4 2 turn ferrite bead 1 x 15 Khz Low Pass Filter 2 x PCB Phone Sockets 1 x 1 amp fuse 2 x Terminal Pins 1 x Limiter PCB2 x PCB Phone Sockets Specifications -------------- Type: Back feed multiple time constant with AGC Input Limiting Threshold: 350 mV RMS, -6 dBu Maximum Input: 12 V RMS, +24 dBu Pre-emphasis: 50 or 75 uS Output Level: 775 mV RMS, 0 dBu Frequency Response: 30 Hz - 15 Khz relative to pre-emphasis Signal to Noise Ratio: -75 dBu Distortion: Less than 0.2% THD at limiting Attack Time: Less than 1 mS Release Time: AGC controlled Indicators: 3 LED's for limiting, -6 dB, 0 dB, +6 dB Power Requirement: 11-16 V DC regulated Audio Sockets: All Phono All measurements taken at 13.8 V DC * R3 = 34K C6 = 2200 pf for 75 uS pre-emphasis