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FAB Modulesall about our FAB Modules |
Here’s a photo of our FAB1215 Power Supply Module, outfitted with our DC-1248 (+48V converter module).
I finally got the chance to test the 48V power supply by hooking up our FAB2010 XLR Input Module, FAB2110 Input Transformer Module, and FAB3010 XLR Output Module, using them as a pass-through before going into an API 512C preamp. But instead of turning on Phantom Power on the API preamp, I used the 48V source on our FAB module.
Yesterday, we got the boards back from the PCB fab house. Today, I built the FAB1215 prototype and tested it. Now, we have a power supply to power all our FAB modules. Yay!
This convenient power supply is powered by a simple 12VDC power adapter (wall wart). The one I’m using is rated 400mA and it’s the only one I can scrounge around… but I’d recommend a 1Amp power adapter so you have plenty of power to spare.
The +/-15Volts is generated by an off-the-shelf part, and the +48Volts for phantom power is generated by our DC-1248 Module (12VDC to 48VDC converter).
The FAB1215 has (1) DC jack to accept the 12Volts input, and (2) IDC headers that route +/-15Volts, and +48Volts so you can power (2) channels of your project. The +/-15V is rated up to 190mA, and the 48Volts is rated up to 60mA (this 60mA figure may change once I finalized on the component values and complete testing). You simply hookup power using 10-pin ribbon cables to your FABs. It’s that easy.
Here’s one of the simplest way to use our FABModules…. Hook up the following FABs together:
FAB2010 – XLR Input Module
FAB2110 – Input Transformer Module
FAB3010 – XLR Output Module
All that’s missing is Power, if you want to enable the -20dB Pad, Phantom Power and Polarity Reverse functions. Otherwise, it will still work without power applied. After all, it’s just an input transformer inserted in your signal chain.
Populated our FAB3010 XLR Output Module. There is a Logic controlled relay, used for Polarity Reverse function. All you need to do is apply a Logic “1” to the header pin (which can be +3.3V, +5V, or your V+ voltage) and it will trigger Polarity Reverse.
The DOA-12 is a high-performance, discrete operational amplifier well suited for demanding audio applications due to it’s low noise, high slew rate, high gain capability, high output capability, and operation over a wide range of power supply voltages. It uses the standard discrete opamp 2520/990 footprint… a roughly 1”x1” device with (6) pins, a format commonly found and used in pro-audio gear.
Running at +/-24Volts supply voltage, the DOA-12 is capable of reaching +26dBu output (loaded with a 600:600 output transformer). Running at a slightly lower +/-18Volts supply voltage, the DOA-12 still achieves an impressive +24dBu maximum output.