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

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Sample FAB Setup – Power supply and other stuff

 

 

 

 

 

 

Here are some photos showing the FAB1215 Power Supply Module powering some FAB modules via a ribbon cable.

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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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XLR Input + Input Transformer Module Combo

Here’s a photo of how the FAB2010 XLR Input Module and FAB2110 Input Transformer Module connect to each other.

I added a 2-pin header on the FAB2010 XLR Input Module. Later, I’ll show you how to connect those pins to your switches to control -20dB Pad and switching of Phantom Power.  I’ll also show you how to connect these pins to a Microprocessor, like an Arduino (AVR) and show it’s logic level capabilities.

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FAB2110 Input Transformer Module – Prototype with parts

Populated our FAB2110 Input Transformer Module with parts.  Here are some photos showing a Jensen JT-11K8-APC Input Transformer mounted on it.

The board looks good, but I’d probably add another mounting hole on the lower right corner, just because the board is a little unstable with a heavy transformer mounted on it.

I’ll build another prototype using a different Input Transformer, like an Altran or EA brand.

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FAB2110 Prototype PCB

Received our FAB2110 Input Transformer Module. Looks good.  No corrections needed, it’s just a very simple PCB. You can use a Jensen, Cinemag, Altran, EA Input Transformer for this PCB.

So let’s say you have a few of these FAB 2110 boards, you can solder a different kind of Input Transformer on each FAB board, and you’ll be able to swap them in and out in your circuit, and compare the sound flavors of each other.

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