Build your own Preamp – FABModules – FiveFish Audio Building Blocks for DIY Projects Blog Articles

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Passing your Audio Signal through an Input Transformer

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.

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FAB3010 XLR Output Module – Prototype with parts

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FAB Modules, FAB3000 Output Modules
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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.

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FAB3010 – XLR Output Module Prototype PCB

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FAB Modules, FAB3000 Output Modules
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Received our FAB3010 XLR Output Module.  Just to recap, the FAB3010 Module includes a relay-controlled Polarity Reverse. All you need to do is apply Logic “1” to the header pins (located on upper left corner) and it will switch the relays on/off.  A Logic “1” can be anywhere from +3.3V to +5V, or up to your V+ voltage.

I need to make a Revision B board because I want to move the XLR jack farther out, so it won’t have any problems with clearances if you want to mount the XLR jack on a .125″ thick case panel.  But other than that, I think it looks good.

Will try to populate this board in the next day or so, so I can test the Polarity Reverse logic control. I don’t foresee any problems, but the proof is in the pudding as they say.

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