The ultra-emperor RA-1 earphone amplifier for DIY ----- Headphone Amplifier

The ultra-emixed RA-1 earphone amplifier for the most DIY, Headphone Amplifier Keywords: Maximum DIY super imitation RA-1 headphone amplifier production American famous Grado Goet Ra-1 headphone amplifier believes that many headphones have known, but their price of 3,000 yuan has made many people hope, such a simple thing, is there really 3000 oceans? There is a word Simple Is Best in Western, and the main meaning of translation into Chinese is "simple, the best." In the European and American audio design sessions, there is also a large number of advanced audio designers to pursue the basic design principles of Simple Is Best. The RA-1 of the song is deeply "simple", and the circuit is very simple, even You can use "It's easy to get simpler." This time I will show you how to do DIY a super imitation songs RA-1 headphone amplifier (in view of the RA-1 circuit diagram taps, too much to find here I am not repeated). This is a blank printed circuit board that is almost exactly the same as the Goet RA-1 headphone amplifier board. From the picture, you can see only nine metaders on the entire printed circuit board. Yes, I believe your eyes, the printed circuit board is indeed only nine metaders. In the entire circuit, even the two 9V laminated batteries are only thirteen components, how? It's simple enough! There are only six resistors on the printed circuit board, two capacitors, a integrated circuit, and two large-volume unusual polyproprene capacitors are hanging from outside the printed circuit board (that is, two of the above figure. Black cylindrical large capacitance). The signal is entered through a pair of RCA lotus sockets. Here I use a non-magnetic gold-plated RCA socket, which already contains left and right channel sockets. To pursue more fever, you can purchase left and right channels completely separate Separate pure copper manufactured gold-plated RCA lotus socket. After the signal is entered from the RCA lotus socket, the volume is adjusted by a 100K dual potentiometer. I use a high-quality 100K Double Tag special potentiometer produced by Taiwan companies. It is necessary to pay attention to it. During debugging and use, a knob must be installed on the spiral of the volume potentiometer, otherwise it will bring induced noise to the back amplifier circuit when the hand is directly touched. Next page

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