Making High Quality Hearing Aid with TDA2822M

Posted by: TDA2822  • Information section:Home appliance

The working principle is that the integrated circuit TDA2822M is an eight-foot double-in-line package. If it can not be replaced by TDA2822, the package of TDA2822 is the same as that of TDA2822M. The difference is that TDA2822M can work from 3V to 15V, while the maximum operating voltage of TDA2822 is only 8V. When using TDA2822, the voltage must be lowered below 8V. The numerical requirement of R1 is unconstrained. Carbon film resistance of 10K is generally selected. C1 can choose 0.1uF polyester capacitor, C2 is 100uF/160V electrolytic capacitor. Figure 5-108 shows the printed circuit board. Because of the simple circuit, the pcb can be polished with a little water by shoveling sandpaper or kraft paper, washed and dried with water, coated with rosin alcohol solution, and welded directly to the copper foil after drying. The voltage between positive and negative output terminals should be less than 0.1V after welding and checking correctly, then the speaker should not be connected and the power supply should be connected. Connect the speaker and touch the input with your hand. The speaker should make a loud "buzz". At this time, the input signal can be audited. The circuit board does not need to drill holes.
 


 

TDA2822M pin chart



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read ()  •  Jun 28, 2019  •  Edit


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