PV5 Preamplifier User Manual
Contents
1. PV5 Pre Amplifier User Manual Analog Metric www analogmetric com sales analogmetric com Copyright 2009 All Rights Reserved PV5 Pre Amplifier J Analog Metric INTRODUCTION The circuit design is referenced to the Conrad John and the values are adjusted and optimized The input stage uses 12AX7in common cathode whereas the output stage uses 12AT7 The signal paths of this PCB layout are designed in symmetry for both channels Dedicated power rails ground and signal paths altogether are taken into design considerations so that all are to minimize the parasitic cross interference and influence of RFI www analogmetric com PV5 Pre Amplifier J Analog Metric FEATURES One 12AX7 and one 12AT7 vacuum tubes Voltage gain 26dB Bandwidth 50KHz Frequency Flatness 20 20KHz 0 6dB S N Ratio gt 94dB THD 0 057 Vin 10dBm and 1KHz 0 087 Vin 6 4dBm and 1 KHz Input impedance 1MQ Output impedance 3KQ Two single ended and two single ended outputs Symmetric layout design and signal paths with minimum parasitic Dedicated ground and power rails layout design Two large reservoir decoupling capacitors for power rails Power requirements one 260V 10mA DC and one 12 6V 0 5A DC PCB dimension 18 4mm W x 11 2mm L PCB thickness 2 4mm double layer 20z copper PRECAUTIONS Do not use any body parts to touch the metal parts of the kit after power up or power off since the high voltage cap2. acitors may not fully discharge It may cause serious electric shock Use a power transformer with fuse 1A socket to limit the supply current in case of short circuit or incorrect assembly Double check the assembled components with the schematics Do not attempt the measure the voltage by multi meter with hand after power up The probes of the multi meter should be mounted by some stands to the points of the measurement before switching on the power supply www analogmetric com PV5 Pre Amplifier J Analog Metric e Turn off the power supply if you observe any smokes or hear strange sound coming out from the transformer or board If there is short circuit the transformer will be getting very hot shortly PROCEDURES 1 Hook up all the components according to the schematic part list and photos Notice to the polarity of the high voltage electrolytic capacitors C7 and C7B There are no polarities of the thin film capacitors 2 Apply either one or two 260V DC to P1 and one 12 6V DC to P2 If you only have one 260V DC supply just connect the two 260V DC pins of P1 together 3 Apply input signals to R IN and L IN respectively The output signals are obtained at R OUT and L OUT correspondingly 4 Enjoy it Cc 850 ANCE 9 gt ot a u z N N 25 w a x LES RE w 3 lt RE o s E GF s k www analogmetric com PV5 Pre Amplifier J Analog Metric CHECKLIST 1 Th
3. e polarity of the high voltage C7 and C7B 2 The supply voltages at connectors P1 and P2 Check whether has 260V DC applied to two pins of P1 If you have any problem in assembly please contact us by email to tech analogmetric com www analogmetric com
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