“Mastery is gained through practice.” This saying is especially true for guitarists. However, loud guitar practice often leads to problems with neighbors. That’s where a compact and convenient guitar headset amp offers a practical solution.
Guitar Headphone Amplifier Technical Specifications
Contents
Power Supply: 12V/500mA DC adapter
Guitar Input: 6.3 mm jack
Output: 6.3 mm jack
Minimum Load Impedance: 20 Ω
Output Power: 1W
Dimensions: 140x35x127 mm
Playing Guitar Without Disturbing the Neighbors
There’s a classic situation almost every guitarist experiences at home:
The electric guitar is connected to the amp, the first notes are played, and soon the doorbell rings. At the door is a neighbor who wants silence and isn’t very happy. Thanks to the guitar headphone amplifier, these kinds of unpleasant experiences are eliminated, and playing guitar becomes enjoyable again.
Thanks to the NE5532 Op-amp and 3-band active tone control (bass, mid, treble) on the device, every guitarist can easily adjust their characteristic tone. The wide adjustment range allows for very effective shaping of the guitar signal’s frequency structure.
Thanks to its compact design, the guitar headphone amp fits easily into almost any guitar case. Only a power outlet is needed for operation; no other equipment is required.
Guitar Headphone Amplifier Circuit Diagram
Guitar Headphone Amplifier Usage and Operating Principle
The guitar headphone amplifier is powered by a 12V / 300 mA DC adapter. The system is ready to use when the adapter’s low-voltage plug is inserted into the 3.5 mm jack socket on the back of the device.
Before connecting the guitar and headphones to the device via the 6.3 mm jack plugs, the GAIN and VOLUME potentiometers must be set to their minimum positions.
This prevents sudden and potentially harmful “pop” sounds during connection.
After the connections are complete, first slightly increase the VOLUME control, then adjust the amplifier’s input sensitivity to match the output level of the guitar pickups using the GAIN setting. The goal is to obtain a clear and distortion-free sound.
Finally, adjust the tone using the High (treble), Middle (middle), and Low (bass) controls; the desired sound level is determined by the VOLUME potentiometer.
Guitar Headphone Amplifier Circuit Structure
The circuit of a guitar headphone amplifier consists of several basic blocks separated according to their functions.
Block Diagram
The first part of the Preamplifier circuit is the preamplifier, which amplifies the guitar signal and provides impedance matching. This stage ensures that the signal at the guitar output is made suitable for the circuit.
Active Tone Control The next section is the active three-band tone control circuit. This structure consists of high-pass filters for high frequencies, band-pass filters for mid frequencies, and low-pass filters for low frequencies.
Although each band can be adjusted individually, frequency boosting or suppression is performed via a single operational amplifier (IC1B).
Amplifier Power Stage
The signal passing through the tone control is amplified to headphone level by the integrated stereo power amplifier, the TDA7053A (IC2). The mono input signal is split into two stereo channels by capacitors C9 and C10.
Volume adjustment is done linearly via the VOLUME potentiometer (R21), which is DC-controlled using the internal reference voltage of the TDA7053A.
The resistor-capacitor networks at the output suppress potential oscillations, while series protection resistors protect the headphones from overload.
The headphone output of the device provides a pseudo-stereo signal suitable for 6.3 mm jack headphones with an impedance of 20 ohms and above.
Power Supply: The 12 V voltage from the adapter is stabilized to 10 V by a 7810 type voltage regulator (IC3) and distributed to the circuit.
The circuit is designed using a single-sided printed circuit board and conventional pinned components. This makes assembly quite easy, even for those new to electronics.
First Setup
Before connecting the device to the adapter:
Set GAIN and VOLUME to minimum.
Set the tone settings to the middle position.
After connecting the guitar and headphones, plug in the adapter. When VOLUME and GAIN are slowly increased, the guitar sound should be heard through the headphones. If the sound is distorted or distorted, the GAIN setting is too high and should be reduced.
Tone controls allow for shaping the guitar sound across a wide range, enabling precise adaptation to different musical genres.
Source: de.elv.com/p/gitarrenkopfhoerer-gha-100-P201968/
