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August 5, 2010
The mentioned shunt-feedback configuration also allows the easy addition of frequency dependent networks in order to obtain an useful, unobtrusive, switchable Tilt control (optional). When SW1 is set in the first position a gentle, shelving... [more]
circuit from:http://www.extremecircuits.net/2009/12/pure-class-headphone-amplifier.html
August 5, 2010
Apart from the obvious usage as a headphone amplifier, the circuit can be used for a range of applications where a wide bandwidth low power amplifier is needed. The circuit is based on an opamp,... [more]
circuit from:http://www.extremecircuits.net/2009/09/stereo-headphone-amplifier-circuit.html
August 5, 2010
Here's a top-class headphone amplifier that can drive high or low impedance 'phones to full power levels, with very low noise and distortion. For best performance, it can be teamed with the Stereo Preamplifier described... [more]
August 5, 2010
This low-cost, general-purpose electronic hearing aid works off 3V DC (2x1.5V battery). The circuit can be easily assembled on a veroboard. For easy assembling and maintenance, use an 8-pin DIP IC socket for TDA2822M. [more]
circuit from:http://www.extremecircuits.net/2009/07/low-cost-hearing-aid.html
August 5, 2010
This circuit, connected to 32 Ohm impedance mini-earphones, can detect very remote sounds. Useful for theatre, cinema and lecture goers: every word will be clearly heard. You can also listen to your television set at... [more]
circuit from:http://www.extremecircuits.net/2009/06/amplified-ear_28.html
August 5, 2010
Commercially available hearing aids are quite costly. Here is an inexpensive hearing aid circuit that uses just four transistors and a few passive components. [more]
circuit from:http://www.extremecircuits.net/2009/07/hearing-aid.html
August 4, 2010
Many times we needed symmetric voltage, but we do not have the possibility him of taking immediately, from a existing supply. Then it will be supposed him we create from the existing single. [more]
August 4, 2010
Many times we needed a variety of voltages, from a battery 12V. With the circuit, we can take voltages smaller or bigger, positive or negative, from a battery 12V. [more]
August 4, 2010
The circuit is a DC to DC converter using a standard 12 VAC center tapped power transformer wired as a blocking oscillator. The circuit is not very efficient but will produce a high voltage usable... [more]
August 4, 2010
The circuit below is designed to be used with the bi-directional lamp sequencer shown above on this same page. Two additional transistors are used to increase the current from the 74HCT138 decoder to control 12... [more]
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