Interactive Voice Control
Basic Functions: Audio Section
I now have the Audio Section up and running... I'm using Rob's IVC board as described below and driving a Mono Amplifier based on the TDA2030 8 Watt IC Amplifier. This is an excellent amplifier - it runs off of 12VDC, has a 94 dBA signal/noise ratio and a 20Hz to 20kHz frequency response, all in a small, low cost package. This I've connected to a Pioneer TS-A878 3.5" 2-way Speaker.
The audio section consists of a set of screw terminals for the audio input and output. The inputs feed a simple 1:1 modem isolation transformer after passing through a 10K trimmer pot/voltage divider circuit. This allows for some adjustment of impedance to ensure compatibility with whatever audio amplifier is connected to the output side. The Hasbro speaker sounds are designed to drive an 8 ohm speaker and are not suitable for direct connection to an external amplifier without some sort of level and impedance matching circuit.
The audio section consists of a set of screw terminals for the audio input and output. The inputs feed a simple 1:1 modem isolation transformer after passing through a 10K trimmer pot/voltage divider circuit. This allows for some adjustment of impedance to ensure compatibility with whatever audio amplifier is connected to the output side. The Hasbro speaker sounds are designed to drive an 8 ohm speaker and are not suitable for direct connection to an external amplifier without some sort of level and impedance matching circuit.
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