Here are some photos showing the FAB1215 Power Supply Module powering some FAB modules via a ribbon cable.
Sample FAB Setup – Power supply and other stuff
Build your own Preamp – FABModules – FiveFish Audio Building Blocks for DIY Projects Blog Articles
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.
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.
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.
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.