Head Phone Amplifier | Electronic Project Circuits

Posts Tagged ‘Head phone amplifier’

Dynamic microphone Amplifier for earphones

I decided to make this circuit so that I could listen to faint noises. It is a simple two-stage transistor amplifier design. The circuit was designed to use the input from a dynamic microphone but I am sure that with some modifications it would be possible to use an electret microphone. The 2N3053 transistors used in the design don’t have a particularly high gain so other types could probably be used as long as they are NPN.
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Source: http://www.geocities.com/electronics3456/soundamp.html Thank you.

Be the first to comment - What do you think? Posted by admin - April 25, 2008 at 10:58 am

Categories: Pre Amplifier Tags: Head phone amplifier, Pre Amplifier, Pre-MIC

A Pure Class A Dynamic Headphone Amplifier

A high-current output amplifier for low-impedance dynamic headphones such as the Grados. The amplifier features an new servo biasing circuit which operates entirely outside the audio feedback loop. The author includes a balanced-bridge version of the amp for headphones that are wired in dual-mono as well as instructions for converting a Grado SR80 to dual-mono operation. The bridged amp will output 4 times the power of the standard amp.

Read More Source: http://headwize.com/projects/showfile.php?file=gilmore3_prj.htm Thank you.

Be the first to comment - What do you think? Posted by admin - March 2, 2008 at 11:24 am

Categories: Power Amplifier Tags: Class A Amplifier, Head phone amplifier, Power Amplifier

The Zen Headphone Amplifier by IRF610

This circuit to obtain the best sound from my Grado SR-325 headphones. Portability here was not imperative, so the high power consumption of a real class a mosfet amplifier headphone was not a big drawback. I developed this project at the beginning of 2002 and it was first presented at DIYaudio.com in February 2002. Since the intellectual property belongs to Pass Labs, this circuit is intended only for not for profit use, unless the current source topology is altered.

The schematic in figure 1 shows one channel of the headphone amp. The HexFets employed are the usual International Rectifier IRF610, both for the active side and for the current source. The circuit is quite simple, only one gain stage built around an IRF610 (Q2 at the bottom of the schematic), biased by another IRF610 (Q1). The two diodes (D1 and D2) are for over-voltage protection purposes: any type, between few volts and about 15-16V will work fine.