Smt Assembly
Audio Amplifier system?
The audio amplifier chip covers Lm4919 I'm. I have to do - at home model: SCH () manufacturing, assembling, and ... I like testing the circuit I used for SMT components In the test, it is effective in the hands near or contact circuit Maybe .... Why? Another problem is, but I'm stimulated and wiring diagrams It is not want my model: SCH software, he asked the same I'm using the chip .... How do I? Shut up about Down, and mute controls .. How do I handle this? Variable Resistance connection?
Or from two causes "does not work Seems to be. "Chip has two logic inputs; shutdown and mute. Maybe If you enter this correctly, they are not connected & amplifier Is turned off? These, if they are floating, and they Place your hands near the high or low they could trigger input Type is very sensitive. The low-power chips, power-amplifier is low. All power amplifiers, with amplifiers are big potential for vibration. (It's possible.) There are two problems: 1) high bandwidth General recommendations for putting inside a small power level Although the output range. From 1 to 100 MHz it can vibrate. If Is true, then this is your problem. 2) Data Sheet Exactly the Power Supply wires and bypass capacitors on Follow. Bypass capacitor, even if the exact problem Model. 3) Please be advised that their Power Amplifier circuit Supply wires directly connected to the amplifier's power supply (Ingredients) do not have a confirmed line. Instead, supply lines and a set of preamp is very Place a small Value Resistor. Instead of tiny inductors and resistors, or I Uses. This removes the possibility of 10 MHz of the oscillatory power supply Line passing through the signal.
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