Transformers / Adapters

Manufacturer Product Image Item Name Price-
Shure A15BT Bridging Transformer

Shure A15BT Bridging Transformer

Shure A15BT This balanced transformer has a 33,000 ohm primary (three-socket) end and either a 7500 ohm or 600 ohm secondary (three-pin) end. Either end can be unbalanced by connecting pins 1 and 3. The A15BT solves problems of matching, bridging, or isolating balanced or unbalanced devices of different impedances and levels. Voltage loss from the 33,000 ohm primary to the 7500 ohm secondary is 6.4 decibels; to the 600 ohm secondary, it is 17.4 decibels. To couple a preamplifier, mixer, or recorder with a 600 ohm line output to a device with a high-level, high impedance, unbalanced (Aux) input, connect the 600 ohm output to the 33,000 ohm balanced–line side of the A15BT. Unbalance the A15BT secondary and connect it to the Aux input. Choose either the 7500 ohm or 600 ohm winding, depending on which provides the proper level and best signal-to-noise ratio. In this configuration, the A15BT "bridges" the 600 ohm line output.

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Most users do not need a license to operate a wireless microphone system. Nevertheless, operating a microphone system without a license is subject to certain restrictions: the system may not cause harmful interference; it must operate at a low power level (not in excess of 50 milliwatts); and it has no protection from interference received from any other device. Purchasers should also be aware that the FCC is currently evaluating use of wireless microphone systems, and these rules are subject to change. For more information, call the FCC at 1-888- CALL-FCC (TTY: 1-888-TELL-FCC) or visit the FCC’s wireless microphone website at