FAB2306 is our Line-Level Balanced Receiver. The FAB2306 uses a THAT 1206-series InGenius balance line receiver chip.  The THAT 1206 uses bootstrapping to raise it’s common-mode input impedance into the meg-ohm range without the noise penalty of using high value resistors. They behave like transformers, able to maintain high CMRR over a wide range of source impedance imbalances, even when fed with an unbalanced signal. But unlike traditional transformers, they offer DC-coupling, low distortion and transparent sound.

The FAB2306 Line Input Module allows you to create gear that works with line-level balanced signals.  There is no need for 48V phantom power, or -20dB padding for this module unlike the FAB2010 Mic Input Module.

3D Rendering of FAB2306 Line Input Module.

This is similar to our FAB2110 Input Transformer Module… but instead of using a CAN type transformer, we’re using a Carnhill/UK Input Transformer, (model VTB-9045) typically used in Neve preamps.

The VTB-9045 Carnhill Transformer is a Low Level Audio Signal Transformer, with a turns ratio of 1+1:2+2.  DC Coil resistance is 24+24:130+130 ohms.

To mount the Carnhill transformer horizontally on this FAB board, a separate Carnhill PCB Adapter is also required.  Both boards will be provided when you purchase this FAB board.

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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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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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Populated the FAB2010 boards tonight. I put too much solder paste on my resistors so I need to be careful doing that. It’s a little hard because I’m just using a plunger to dispense the paste. I need to get one of those solder paste pump dispenser. I’ve seen them on eBay for around $150 or so.

Anyway, here are some pictures.

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