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Copyright
©
2010 FiveFish Studios
For comments & corrections about this guide, please email [email protected]
www.fivefishstudios.com
X-12 Microphone Preamp Kit
Features, Advantages and Benefits of the X-12 Mic Preamp
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Uses High-Nickel Mic Input Transformer with MuMetal Shielding
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Uses Output Transformer for additional 6dB gain and balancing duty
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12-step Gain control from +22 to +66dB, in 4dB increments
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5-LED VU Meter Monitoring
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Low-Noise, High-Quality, 600-ohm capable Monolitic OpAmp chip
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Option to use Discrete 2520/990 footprint OpAmp instead of Monolitic OpAmp chips
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Chipsets from National Semiconductors, Burr-Brown
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Using high-current, high-speed, video buffer driver at 2000V/us slew rate
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Soft-start, slow ramp-on +48V phantom power, controlled by illuminated push button
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Transformer balanced input and output stage
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12-position Grayhill gain selector switch
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Input RFI protection
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Transformer isolated inputs
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Transformer isolated outputs
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Reduced clicking and popping when changing gains
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Voltage offset adjustment trimmer
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High quality Bourns, sealed, conductive plastic potentiometer for trim control
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High quality PCB Mounted, LED-illuminated Push Button Switches
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-20dB Pad, relay controlled
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Polarity Reverse switch, relay controlled
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Gold-plated, machined, low-profile IC sockets
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Use of high quality 1% Metal Film resistors, and high-quality ceramic and electrolytic capacitors
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On-board jumper terminals
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On-board and local voltage regulation section
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Easy to assemble, easy to troubleshoot design
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Each component carefully labeled, protected and packed in separate zip bags
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Thick PCB board with 2oz. copper
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Very affordable!!! No, this is not “cheap junk” but a high quality product that is reasonably affordable! (i.e. because
there is no middlemen, and we don’t do expensive glossy magazine advertising! )
Basic Tools Required
A few basic tools are required to build this kit.
1.
Soldering iron – adjustable temperature recommended, but not necessary. Your soldering iron must have a sharp
conical tip. I do not recommend a “flat-head, screwdriver-type” soldering iron. DO NOT USE A SOLDERING GUN. They
are usually rated at 100Watts and are overkill for this project.
2.
Mini Pliers Cutter – to cut component leads, wires, strip insulation off wires (if you don’t have a wire-stripper tool).
3.
Mini Long Nose Pliers – to bend component leads, use as a heatsink, hold components, tighten bolts.
