TDA7439 tone control
Description:
Browsing through the Elektor magazine my brother found an interesting tone control based on Sony IC, but it was impossible for us to find this IC in any of the component shops we know of. We then found a very similar Sony IC the TDA7439, and this IC also gave opportunity to control the mid range band as a bonus.
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Zoom in on the IR sensor, we have covered the pins with insulation from some wire.