9V battery headphone amplifier ----- Headphone Amplifier

9V battery headphone amplifier, Headphone Amplifier Keywords: HIFI headphone amplifier production, headphone amplifier circuit This simple headphone amplifier mainly refers to http://www.headwize.com/projects/cmoy2_prj.htm chu Moy's work, but a slightly modified, plus the Fred Peng brother's Waiting line for the grado headset production equipped drive Complete, because there is no additional buffer if you are afraid. The main zoom model: Original production IC uses OPA132, I will use OPA134, after receiving OPA132, then change again, R2 I use 100K, plus P1 10kA's double VR, C1 uses Philips MKT 1μ, because the current CD Player gain is large enough Take R3, R4, pure as buffer. Power part: With a 9V battery, the LED is currently using a general LED, resistance, and the capacitors are used, and the output + -4.5V supply OP is used. Be Top view: Surrounding the LEDs directly to the board, use the terminal block because this is Protype, to test the different lines and non-added differences, the wiring is convenient, the next job is to design smaller more suitable PCB, saving the province, in line with a thin and short principle. Front view: Two cave panels with ordinary plastic boxes plus a 9V battery and not find a smaller 10kA double VR. (The hole is also very ugly, the earphone seat is hard to stick hard) if you can buy this VR: Be Be Side view audition map Completion map: Be Summarize: Audiovisual equipment: Rega Planet CD Player, Headphones Audio Technica ATH-F15 (more than 400 yuan) (planned Sennheiser HD580) Plus the equivalent line personal feeling is really better, and is currently the signal first variant line to the OP part. If you can smaller, it is very good to match the CD, MD Walkman is very nice. New version plan and problem: To reduce the version of the PCB and plus some gain, because the etiology line will weake the signal (currently listening to environmental gain enough, but I don't know if you listen). There is a smaller VR fit. (If you can't buy it in China, I have to mail order) With a metal casing, there is a better shielding SN ratio. It's too handsome like this candy box (I don't know where to buy it?) Better Small Suit (I don't know where to sell?) Suitable small switches (I don't know where to sell?) Low Current LED (I don't know where to sell?), There is only a little bit brightness in general LEDs. The author is Shangshang, please give me a lot of advice.

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