The Lectrosonics ISO9VOLT battery eliminator allows wireless transmitters with hinged battery doors designed for 9 volt batteries to be operated from external power sources. 10 to 18 volt DC is converted to regulated 9 volt DC to power the transmitter at the battery terminals inside the battery compartment. The modified door exposes the connector for the external power source yet still operates with regular dry cell batteries.
The unit can supply up to 200mA to work with the 250mW transmitters. It is fused and protected from reverse polarity. The unique design isolates the power ground from the audio ground in the transmitter allowing the unit to be used in "bag systems" common in field production. When the mixer, receivers and wireless transmitters in a bag are powered by a common battery, a ground loop is often created which can cause high frequency noise (whining or hiss) in the audio. The external DC is run through a low drop out 12 volt regulator and then passed on to a DC/ DC converter that produce an 800kHz square wave. The square wave is passed through a transformer, rectified and then passed through a low dropout 9 volt regulator to produce the final DC power presented on the battery contacts.
Lectrosonics ISO9VOLT Features
Allows external powering of Lectrosonics aluminum transmitters
Standard 9 volt battery contacts and DC input jack on "dummy battery"
Modified battery doors available for both Belt-Pack and Plug-On transmitters with flip-open style battery doors
Preserves use with regular alkaline or lithium batteries