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The VSD-1 is to aid visually impaired people who desire to use telephones with visual supervision signals.
Use the a.c. power supply when possible. The power supply connects to the side of the VSD-1 as shown.
When it is not convenient to use the a.c. supply, the VSD-1 may be battery powered. Open the battery compartment on the rear of the VSD-1 by sliding it down. Install a 9v battery and replace the cover. The a.c. supply does not charge the battery. You may leave the battery in while the a.c. supply is connected.
Connect the earphone to the jack in the top of the VSD-1. The jack is located between the volume control and the fiber optic cable. The earphone has a 3’ cord. You may connect any style earphone to the VSD-1, provided it has an 8 ohm impedance, and a mini-phono jack.
The knob on the top of the VSD-1 controls the volume and turns the unit on and off. When the knob is rotated fully counterclockwise the VSD-1 is off. Rotating the knob clockwise turns the VSD-1 on and increases the volume.
The probe portion is a fiber optic cable with a small plastic wand at the end. The probe is fixed to the amplifier and cannot be removed.
