# Analog Headphone Amplifier

Precision Portable Analog Headphone Amplifier

- **Seller:** [SOUNDit](https://lectronz.com/stores/soundit), St. Gallen, Switzerland
- **Price:** €15.00 (EUR, before shipping and taxes)
- **Availability:** In stock
- **Categories:** Amplifier, Power management, USB
- **Country of origin:** Switzerland
- **Product page:** https://lectronz.com/products/analog-headphone-amplifier

## Images

![Analog Headphone Amplifier](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NjY0NDgsInB1ciI6ImJsb2JfaWQifX0=--4fbb1d57c8e9b3f49094ccb1103ad68d972a74b9/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGVnIiwicmVzaXplX3RvX2xpbWl0IjpbOTYwLDY0MF0sInNhdmVyIjp7InN0cmlwIjp0cnVlfX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--4e27bac8cdfb621fb828f6a3a5982fe1a423b516/image00003.jpeg)
![Analog Headphone Amplifier](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NjY0NDQsInB1ciI6ImJsb2JfaWQifX0=--49fae390325e375be1fe2420e4d9843107137c11/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGVnIiwicmVzaXplX3RvX2xpbWl0IjpbOTYwLDY0MF0sInNhdmVyIjp7InN0cmlwIjp0cnVlfX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--4e27bac8cdfb621fb828f6a3a5982fe1a423b516/image00002.jpeg)
![Analog Headphone Amplifier](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NjY0NDAsInB1ciI6ImJsb2JfaWQifX0=--9b9766bcf62da13d7c39efa2ea8cd8275aea606f/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGVnIiwicmVzaXplX3RvX2xpbWl0IjpbOTYwLDY0MF0sInNhdmVyIjp7InN0cmlwIjp0cnVlfX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--4e27bac8cdfb621fb828f6a3a5982fe1a423b516/image00001.jpeg)
![Analog Headphone Amplifier](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NjY0NTIsInB1ciI6ImJsb2JfaWQifX0=--06d7292dd9a44f9601b213b6a9e2a4d5baf36ac3/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGVnIiwicmVzaXplX3RvX2xpbWl0IjpbOTYwLDY0MF0sInNhdmVyIjp7InN0cmlwIjp0cnVlfX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--4e27bac8cdfb621fb828f6a3a5982fe1a423b516/image00004.jpeg)
![Analog Headphone Amplifier](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NjY0NTYsInB1ciI6ImJsb2JfaWQifX0=--278cbbd484c2efa216a21502ecd08c58b356d16d/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGVnIiwicmVzaXplX3RvX2xpbWl0IjpbOTYwLDY0MF0sInNhdmVyIjp7InN0cmlwIjp0cnVlfX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--4e27bac8cdfb621fb828f6a3a5982fe1a423b516/image00005.jpeg)
![Analog Headphone Amplifier](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NjY0NjAsInB1ciI6ImJsb2JfaWQifX0=--04b807d92df37e31213f7208ca15bf2b6ee0ca8a/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGVnIiwicmVzaXplX3RvX2xpbWl0IjpbOTYwLDY0MF0sInNhdmVyIjp7InN0cmlwIjp0cnVlfX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--4e27bac8cdfb621fb828f6a3a5982fe1a423b516/image00006.jpeg)
![Analog Headphone Amplifier](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NjY0NjQsInB1ciI6ImJsb2JfaWQifX0=--9fda645bb31c0a134d20d29d957ba438cddd2b0f/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGVnIiwicmVzaXplX3RvX2xpbWl0IjpbOTYwLDY0MF0sInNhdmVyIjp7InN0cmlwIjp0cnVlfX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--4e27bac8cdfb621fb828f6a3a5982fe1a423b516/image0.jpeg)
![Analog Headphone Amplifier](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NjY0NjgsInB1ciI6ImJsb2JfaWQifX0=--cc17da7db2bf1b031a42a5b077267b464c509834/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGVnIiwicmVzaXplX3RvX2xpbWl0IjpbOTYwLDY0MF0sInNhdmVyIjp7InN0cmlwIjp0cnVlfX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--4e27bac8cdfb621fb828f6a3a5982fe1a423b516/image4.jpeg)

## Description

**LME-Series Audiophile Portable Headphone Amplifier

Precision Triple-Stage Architecture with Dual-Rail Power**

Experience studio-grade transparency in a pocketable form factor. This amplifier is designed for listeners who demand a "black" noise floor and zero-compromise signal integrity. By combining high-performance LME-series op-amps with a dedicated LM4880 driver, this amp delivers effortless musicality for both sensitive IEMs and studio monitors.
The Audio Path

Input Buffer (LME49721): A high-impedance Rail-to-Rail input stage ensuring your source (DAC or Phone) is never loaded down.

Active Baxandall Volume: Avoids the channel imbalance of standard passive pots, providing linear, precise volume control.

Power Driver (LM4880): A dedicated output stage delivering a clean 55mW per channel (@ 32Ω).

Hardware Safety: Equipped with 220uF safety coupling capacitors. This provides a physical DC-blocking barrier, protecting your headphones while maintaining a flat response from 22Hz to 20kHz.

**Advanced Power & Battery Management**

Single Li-Ion/LiPo battery charger with a maximal charge current of 500mA;

Primary-side protection IC for single-cell Li-ion/Li-polymer batteries with OVP, UVP and Overcurrent/Short Circuit;

'Resistor-coded' USB-C 5V input used to charge the battery and/or to power up the board;

This design features a stabilized ±2.7V dual-rail system powered by the LM27762 charge pump + LDO.

Dual Power Modes: The unit operates seamlessly from an internal battery or via USB power (which also charges the battery).

Smart Logic: Integrated LTC2954 push-button control and TPS22917 high-side isolation.

Ultra-Low Standby: Off-state consumption is < 1uA, so your battery stays ready for months.

Battery Requirements: Compatible with any Single-Cell (3.7V) Li-Ion or LiPo battery.

Connector: Molex PicoBlade 2-pin.

**Note:**  Battery is not included due to shipping regulations.

**Precision Bass Boost**

A toggleable +6dB (2x) shelving filter tuned to a 350Hz corner frequency. It adds musical weight and "body" to lean-sounding headphones without bleeding into the vocal midrange.

**Technical Specifications**

Op-Amps	LME49721 (Ultra-low Distortion)

Output Power	55mW per channel (@ 32Ω)

Frequency Response	22Hz – 20kHz (@ 32Ω)

Bass Boost	+6dB Shelving @ 350Hz

Power Consumption	~35mA (Active) / < 1uA (Standby)

Battery Connector	Molex PicoBlade (2-pin)

Charging	Integrated USB Charging (BQ-series)

**A Special Thanks**

This project was made possible by the support of **[PCBWay](https://www.pcbway.com/)**, who sponsored the high-precision PCB manufacturing for this design. Their industry-leading fabrication ensures the tight tolerances required for our ultra-low-noise dual-rail power system. From the easy ordering process to the final delivery, their service has been a game-changer for this project.

PCB measures: 75mm x 45mm x 12mm (L x W x H)