DIY TC9153AP volume control circuit

DIY TC9153AP volume control circuit

"Newsletter" describes TC9153 application papers published many articles and press articles about my DIY without success. After the "electronic newspaper" published "application TC9153 thinking," a text, DIY after the volume can be adjusted, but the noise is too great to use, according to the article describes how to adjust the potentiometer R1 invalid.
Since Toshiba's electronic document does not directly give the application circuit TC9153, I had to bite the bullet and had to bite the document, and finally found the reason: the original "Applications" Man of the ground made a mistake, no wonder he also appeared in "toot "" dth "impulse noise. Now I draw the following circuit diagram available for friends who have not produced a successful DIY reference. Also, when I suggested DIY best to be placed in front of the circuit inputs, because the circuit overload poor. After I modified the circuit diagram as follows:

按此在新窗口浏览图片

The principle is a potentiometer IC, R1 in series respectively to the one described above in FIG inputs, R2 resistor. After my test, when the resistance is 47K, the piece with a large dynamic CD playback will appear distorted when increased to 68K after the distortion disappears, so DIYER can choose according to the actual size of the resistor. After my class of 96 times magnification, late at night when one meter test basic hear the horn noise, the effect of the volume control IC is also excellent.
Do their own PCB, though a little ugly, but after spending a few days of hard work, but this is the real DIY ~ ~ ~

Here in need of special note are:
1) where the audio with the power ground must be strictly separated, or will be introduced around 10Hz modulated pulse;
2) C1 electrolytic capacitor in parallel with the resistor R3 is mainly controlled initial volume, large capacity the initial volume large, otherwise small.
3) does not shield the IC, of course, the best shielding.
Well after all adjustments, you can use, and I put this little wrench into the amplifier chassis, near the input terminals of the idle position, it seems not destroy the layout and appearance of the original amp it!

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