The PHF-3 has external connections to car battery, ignition sense, car radio muting, external microphone and external speaker. The unit has a HF-connector that provides an interface to the phone via external antenna unit. The connection can be made directly or using the extension cable between PHF-3 and AAH-1D. There is also an internal speaker inside the handsfree unit.
The unit consists of a switching mode rapid charger, HF-speaker and HF-microphone amplifiers, volume control circuit, voltage regulators, control circuit (microprocessor) and a CAP compatible interface.
The PHF-3 is always connected to the car battery. To save the car battery, PHF-3 goes in to the sleep mode if the car is not running and/or the phone is not connected.
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You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.