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MICROPHONE PREAMPLIFIER
PO Box 204 Boulder, CO. 80306
email: info@gracedesign.com
Revision
LLC Lunatec © Copyright 1998,
A December, 1998
fax: 303.444.4634
voice: 303.443.7454
LUNATEC V2
OWNERS MANUAL
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Thank you for purchasing the Lunatec V2 portable microphone preamplifier. It is designed and built to be extremely reliable and easy to use. This owner's manual includes important setup and operation instructions . Please take the time to familiarize yourself with the se instructions which will help to avoid user problems. Grace Design has been building professional audio products for the recording industry for over ten years. During this time the circuit technology embedded in the Lunate
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CONTROL Each gain control has 11 positions and adjusts the voltage gain from 10dB to 60dB in 5dB steps. CONTROL The trim control provides 10dB of continuously variable output attenuation. In the fully clockwise position the trim is at unity (no attenuation). In the fully counter-clockwise position the trim is at - 10dB. For reference, the 3 o’clock position is - 4dB and the 12 o’clock position is - 8dB. The trim control should be left in the fully clockwise position during normal recording
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CONNECTING THE PREAMPLIFIER Input connections are made using female XLR connectors. These are wired with pin 2 positive, pin 3 negative and pin 1 ground. 48V phantom power, if used, is supplied on pins 2 and 3. Output connections are made using male XLR connectors or RCA phono jacks. The connectors are wired with pin 2 positive, pin 3 negative and pin 1 ground. Use the RCA phono jacks for unbalanced output. If the XLR outputs are to be used unbalanced, a modified cable is required and pin 3
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OPER SETTING THE GAIN Turn the gain control fully counter-clockwise, turn the trim control fully clockwise and check that the +48V phantom power is off. Connect the microphone to the preamplifier and then turn the phantom power switch on if required. When sending a signal to a tape recorder that has fixed input levels, simply increase the gain until the optimum recording level is reached. When sending a signal to a tape recorder with a variable input use the following procedure: Turn the gain
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With a standard pair of 48V condenser microphones the V2 draws roughly .48A. In our lab we have tested the V2 with an ECO-CHARGE Beta 6V 7.2A/h battery system. The V2 shuts down automatically after 13+ hours with a pair of Countryman Note that this represents a complete discharge of a new and completely charged battery and if used in this fashion repeatedly the battery would degrade rapidly. 10 hours would be a conservative estimate .. A simple formula to determine useful battery life in ho
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SN #V054 and below SN #V055 and above 7 Figure 4. Circuit Board Jumper Locations Figure 3. Circuit Board Jumper Locations
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SPECIFIC @ 60dB gain < 130dB FREQUENCY RESPONSE +/- 3dB @ 60dB gain: 6Hz-250kHz + 20dBu out @ 20dB gain 0.0011% + 20dBu out @ 40dB gain 0.0011% + 20dBu out @ 60dB gain 0.0046% @ 40dB gain + 25dBu out < .0025% @ 60dB gain 50 Ohm source 130dB PHASE DEVIATION 50- 20Khz <8° CROSSTALK Either Channel - 109dB @ 60dB gain, 3.5Vcm, 1KHz 80dB @ 60dB gain, 3.5Vcm , 10KHz 97dB Output 60dB Balanced + 27dB Unbalanced + 21dBu Input 1600Ohms Output 150Ohms Minimum Load Impedance 600Ohms WEIGHT L5.5” x W8.3”
