FAB3346 is an unbalanced to balanced line driver module using a THAT1646 PDIP8 chip.

The THAT 1646 is a new generation of monolithic audio differential line driver offering improved performance over conventional cross-coupled  designs. Based on a high-performance, fully differential opamp and laser-trimmed thin-film resistors, the THAT 1646 exhibits low noise and distortion, high slew rate, and wide output swing. The THAT1646 is stable when driving difficult loads, and have short-circuit protected outputs.

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I added extra pads on the PCB so you can have easy access to the V+,GND,OUT+,OUT- signal lines on the board.  This is useful if you’ll be using our FAB2010 XLR Input Module, and FAB3010 XLR Output Module in your own project and you just want to solder your voltage and control wires directly to the board (without using the Ribbon connector or a breakout board).

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FAB3000 Output Modules All modules related to the Output Section. These will include XLR Male jacks, TRS jacks, Output Transformers, Balanced Line Drivers, Sends, Auxilliary Outputs, etc

• FAB3010 – XLR Output Module
• FAB3110 – Output Transformer Module
• FAB3130 – Edcor Output Transformer, PC Series Module

I did a quick test just to see if all the FAB Modules work and play well together.  I’m very pleased with the results…. The modules were quiet, and even with a long signal chain as you can see in the picture, there was hardly any noise I could hear.  (For testing, I hooked up a condenser microphone and connected the outputs to a KRK RP8 8″ Monitors. No humming, no RF noise, nothing.)

Everything works… the logic control Phantom Power, -20dB Pad, Polarity Reverse, and the +6dB Boost (1:2 Transformer Ratio).  To get the FAB4312 Non-Inverting Amplifier working, I hooked up a small 10K potentiometer so I can adjust gain.  For now, I just used a jumper and connected the Phantom Power Logic control inputs directly to a spare V+ terminal on the FAB1215 PSU module.

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Here’s a photo of a fully assembled FAB3110 Output Transformer Module.

You can use any API-type output transformer on this module. Shown here is an EA transformer, but you can also use transformers from Cinemag, Crimson Audio, etc…

There is a Logic control on the FAB module, allowing you to switch your transformer ratio from 1:1 to 1:2 (+6dB gain). Just apply any +3.3V, +5V or V+ voltage on this logic pin.

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