Rangkaian Penguat Headphone

type='html'>Penguat Headphone Hi-fi

This circuit can be used for a headphone amplifier, arose after the purchase of commercial equipment with separate pre and power amplifiers without a headphone output. The intention is to permanently insert the headphone amp between pre and power amps. The gain control being used to pre-set the gain so that the pre-amp's gain control is normally used for setting the listening level.

Skema Rangkaian Penguat Headphone

Its advantages are :

• low output impedance to drive several pairs of phones
• The active gain stage is, almost, perfectly logarithmic and ...
• Independent of the absolute value of the pot
• Excellent channel tracking
• O/P noise reduces with gain reduction.

The first stage is a conventional series feedback circuit using the ubiquitous NE5534, the gain being set by the feedback AOT (adjust on test) resistor to suit individual needs, this stage provides the necessary low impedance output for the variable gain stage. The resistor/ capacitor networks around the input stage may seem a little extravagant, but are necessary to reduce any possible RF pickup especially the 470 pF between the two IC + and - inputs.

The complete second stage consists of a zero gain follower, an inverting gain stage and the output emitter followers, 'volume control' gain being set around these three stages. The x10 gain of the inverting stage gives the closest approach to a logarithmic law, stability being ensured by the 27pf capacitor in this stage's feedback. The output complementary pair runs in Class-A at about 80 mA and should be mounted on a small heatsink.

9 Volt Portable Headphone Amplifier Circuit

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Here I present a very simple and powerful headphone amplifier Circuit using NE5534/2 . In addition to the IC NE5534/2, the circuit uses only few passive components and can easily generate a lot of sound from even the most inefficient headphones and there will be no compromise for the quality.

Circuit of 9 Volt Portable Headphone Amplifier

The 5534/2 is a low-distortion, low-noise device, having also the ability to drive low-impedance loads to a full voltage swing while maintaining low distortion. Furthermore, it is fully output short-circuit proof. Therefore, this circuit was implemented with a single 5532 chip forming a pair of stereo, inverting amplifiers, having an ac gain of about 3.5 and capable of delivering up to 3.6V peak-to-peak into a 32 Ohm load (corresponding to 50mW RMS) at less than 0.025% total harmonic distortion (1kHz & 10kHz).

List Component of Portable Headphone Amplifier

P1 = 22K
R1 = 18K
R2 = 68K
R3 = 68K
R4 = 68K
R5 = 18K
R6 = 68K
C1 = 4.7uF/25v
C2 = 4.7uF/25v
C3 = 22pF
C4 = 220uF/25v
C5 = 220uF/25v
C6 = 4.7uF/25v
C7 = 22pF
C8 = 220uF/25v
J1 = 3.5mm Stereo Jack
B1 = 9V Alkaline Battery
IC1 = NE5532 or NE5534
SW1 = SPST Toggle Switch

Circuit From: www.redcircuits.com

3VDC Stereo Headphone Amplifier by IC LM4910

This is a stereo headphone amplifier circuit of using LM4910 IC. This circuit is very simple so it is very easy to make even for beginners once. because the voltage source is used only 3 VDC you can use 2 x A3 battery in series stacking.

 

Circuit diagram of 3VDC Stereo Headphone 

Amplifier by LM4910 

IC LM4910 Pinout

LM4910 Boomer belonging to the series of National Semiconductors is an integrated stereo amplifier is primarily intended for headphone stereo applications. The IC can be operated from 3.3V ans its 0.35mW can deliver output power into a 32 ohm load. The LM4910 has very low distortion (less than 1%) and the shutdown current is less than 1uA. This low shutdown current makes it Suitable for battery operated applications.

C1 and C2 are the input DC decoupling capacitors for the left and right input channels. R1 and R2 are the respective input resistors. R3 is the feed back resistor for left channel while R4 is the feed back resistor for the right channel. C3 is the power supply filter capacitor. The feedback resistors also sets the closed loop gain in conjunction with the corresponding input resistors.