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Aug 07, 2016, 09:10 PM
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TDA1517 final assembly

Soldered it in a stereo configuration with a pair of 4R speakers. This went down like a lead weight. Despite the LM324 providing both sides of the waveform thanks to its actively driven virtual ground of 5V, the TDA1517 only put out the bottom half. The TDA1517 didn't even turn on at the vehicle's 8.4V. The input protection diode dropped it to 7.7V & this was below the minimum. It needed 9V to turn on, which the diode dropped to 8.3V.

For some reason, wiring the speakers in series to give 8R got both sides of the waveform. This only amplified a single channel, but seemed to be loud enough to do the job. The circuit needed 0.25A, so a tiny 350mAh cell would boost the vehicle's voltage enough for it to work. The mane problem is enclosing it all in a module suitable for attaching to the vehicle.

It's theorized that the speakers can use the cargo bay as a resonator instead of requiring their own box.
Last edited by Jack Crossfire; Aug 07, 2016 at 09:24 PM.
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