1/3
A96F -- Line Matching Transformer
General Description
This transformer connects microphones with an
XLR-type connector to the 3.5 mm (1/8 in.) inputs
found on camcorders and other recording de
vices. It increases the signal level from the micro
phone, provides a balanced input, and prevents
distortion due to the d.c. bias typically found in
camcorder microphone inputs.
Impedance Selection
The A96F can be modified for microphones rated at 150
Ω
. This modification is only necessary if the output level
from the A96F is insufficient for your recording device. Use the following steps:
1. Access the wiring in the XLR plug element of the A96F by loosening the screw and sliding the plug from the
case.
2.
Unsolder the RED lead from pin 2. Insulate the bare wire at the end of the lead with the insulator from the YEL
LOW lead.
3. Solder the YELLOW lead to pin 2.
4. Rotate the plug element three turns to twist the leads and replace the element in the housing. Replace the
screw.
Troubleshooting
1. Unscrew the housing from the miniature plug on the A96F to expose the wires inside the connector.
2. Use wire clippers to cut and remove the wire between the tip and ring leads (see figure below). Make sure to
remove the wire completely from between the leads so that there is no contact between the tip and ring.
3. Reassemble the plug.