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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.
This is our FAB3130 module for the Edcor PC Series output transformers. These output transformers are inexpensive, but I find they have a flavorful sound. The PC Series though has a limited headroom and saturates early… maybe that’s the reason for the flavored sound? I find that these Edcor transformers add thickness and body to the sound. You’ll definitely notice it. Inexpensive, but effective!
Just like our FAB3110 Module, there is a Logic Level control input so you can select either 1:1, or 1:2 ratio with the output transformer.
UPDATE: Made a Rev.B FAB3130 board, increasing the size of the PCB to match the dimensions of our FAB3110 Output Transformer Module (for Cinemag, Crimson Audio). Tonight, I sent the boards out to the PCB manufacturer… we should get our finished prototype boards sometime next week.
The FAB3110 – Output Transformer Module is designed for PCB mounting of typical output transformers like the Cinemag CMOQ-2S and compatibles. These type of transformers are commonly used in “API-type/style” preamps.
You typically connect the FAB3110 Output Transformer Module after your amplifying module (FAB4000 series modules). That way, your processed/amplified signal chain will go first through the output transformer.
A FAB3010 XLR Ouput Module could then be connected after the FAB3110 Output Transformer Module.