I have been using a Sony Bluetooth Microphone and Receiver system
(http://www.sonystyle.com/is-bin/INT...Name=acc_DIAccessories_DICamcorderMicrophones )
with my Sony Camcorder with a proprietary connector that supplies power and audio inputs from the camcorder (called an Active Interface Shoe-AIS).
I recently purchased a more professional Sony Camcorder with XLR audio (the Sony HVR-v1U) which doesn't have the Active Interface Shoe, but does have XLR inputs with 48v phantom power. I want to try to use the bluetooth receiver with my new Pro camcorder.
The bluetooth receiver is powered by 7.2 volts. I've performed the custom wiring and I can get it to work well stand-alone with a 7.2v battery. I measured the current draw when operating the bluetooth receiver and it is 65 milliamps.
With a simple voltage divider circuit using a 630 ohm and 110 ohm resistor I can get the 48v down to 7.2 volts to power the bluetooth receiver. However, I'm afraid I'm losing a lot of power with 3w of power dissipation and heat, which will drain the camcorder battery quite quickly.
Is there a simple way for me to reduce this voltage without wasting precious camcorder battery power unncessarily?
Thanks in advance for any advice.
-Keith
(http://www.sonystyle.com/is-bin/INT...Name=acc_DIAccessories_DICamcorderMicrophones )
with my Sony Camcorder with a proprietary connector that supplies power and audio inputs from the camcorder (called an Active Interface Shoe-AIS).
I recently purchased a more professional Sony Camcorder with XLR audio (the Sony HVR-v1U) which doesn't have the Active Interface Shoe, but does have XLR inputs with 48v phantom power. I want to try to use the bluetooth receiver with my new Pro camcorder.
The bluetooth receiver is powered by 7.2 volts. I've performed the custom wiring and I can get it to work well stand-alone with a 7.2v battery. I measured the current draw when operating the bluetooth receiver and it is 65 milliamps.
With a simple voltage divider circuit using a 630 ohm and 110 ohm resistor I can get the 48v down to 7.2 volts to power the bluetooth receiver. However, I'm afraid I'm losing a lot of power with 3w of power dissipation and heat, which will drain the camcorder battery quite quickly.
Is there a simple way for me to reduce this voltage without wasting precious camcorder battery power unncessarily?
Thanks in advance for any advice.
-Keith