Transformers / Adapters
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 balancedâ€“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.
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