Headphone amplifier review

The project idea: I wanted to make an amplifier capable of driving various high impedance headphones, with as little distortion as possible. One key feature that I had in mind for this design was the very high-quality component selection, which gave my device a competitive advantage in terms of quality to price ratio in comparison to other market alternatives. The amplifier's maximum gain is 20dB with a THD of 0.03%. Circuit description: The power input (5-16V) is protected against short circuit and overvoltage. A single to double power supply converter circuit consisting of a TLE2141 and a push-pull power stage (BD139 and BD140) is supplying the voltages to the rest of the audio circuit. The audio signal goes through a non-inverting voltage amplifier (LM4562) and a class AB diode biased power stage (BD139 and BD140, 1N4148) with negative feedback provided by an unity-gain buffer amplifier (LM4562). The power supply bypass and signal output decoupling capacitors are Nichicon Muse (KZ series) and the signal input decoupling capacitors are Wima (MKS 4 series). The layer stackup is, from top to bottom: ground, power, signal, ground.


Jun 20,2018
1,830 viewsReport item
PCB
HDI PCB
Assembly
FPC/
Rigid-Flex
X
Choose Num (pcs)
2 Layers
1.6mm
CNC
Machining
Sheet Metal
3D Printing
Injection
Molding
Aluminum
Aluminum
Resin
ABS
Doru Irimescu View Profile
5posts 2followers 0following
  • Comments(0)
  • Likes(0)
You can only upload 1 files in total. Each file cannot exceed 2MB. Supports JPG, JPEG, GIF, PNG, BMP
0 / 10000

    More by Doru Irimescu

    You might like

    Perfect build, Perfect packing, Perfect Delivery
    I designed a custom Arduino shield to streamline the connection between motor controllers and the Arduino board. This shield integrates seamlessly with the Arduino, providing convenient terminals for ...
    excellent print quality, very good pressure
    This card embeeds the electronics of a check point used in the timing of soap box races. One copy of the check point is positioned on the starting line of the race, and another copy on the finish line...
    Overlay and silk screen front and back panel for extruded aluminium enclosure. Good job with prompt service as usual. Lifted the presentation of the completed item.
    Modeling the M4x0.7mm threaded holes eliminated the need for tapping and works perfectly. Quality is fine for having no post processing done. Thank you!.
    This card features galvanic isolation based on the use of photo-couplers for the inputs and drivers for external relays (MOSFETs or bipolar transistors) for the outputs. It also includes configurable ...
    Easy entry, good price, excellent quality and fast delivery. PCBWay offers one of the best services for circuits board on the internet, and their KiCad plugin makes it even better.
    SHOW ME MORE