Electronics Infoline Web

Preamplifier

This preamp is very simple, and will work under tough conditions. The input impedance is pretty high, so it won't load down electric guitars.

http://www.bobblick.com/techref/projects/preamp/preamp.html

Basic Passive Linestage

A passive linestage is simple to build and makes an excellent first audio project. Building one is a good way to practice soldering skills and construction techniques, and as no power supply or active components are required it is also a safe project for beginners.

http://www.users.bigpond.com/aagreen/passive01.html

Hi-Fi Preamplifier

It has an exceptionally fast high frequency response, as demonstrated by applying an 100kHz squarewave to the input.

http://www.mitedu.freeserve.co.uk/Circuits/Audio/gmpre.htm

Passive Preamps

Passive preamps have gained popularity in high-end audio circles. Provided that a high quality volume control is used, a passive preamp is often the easiest and cheapest way to reach high-end sound quality.

http://www.dact.com/html/passive_preamp.html

A DIY passive preamplifier

The preamplifier is the device that has always attracted me, from a circuitry point of view. The main duty of a preamplifier is to raise the signal from a source's output level to an amplifiers input level.

http://www.tnt-audio.com/clinica/pressive_e.html

A simple line stage preamplifier project

The general idea is to build a basic line stage preamplifier that allows for a number of different designs and valves to be experimented with. Initially it should be built with good commercial components, nothing fancy.

http://www.users.globalnet.co.uk/~valveamp/LinePreProject.htm

A Transformer Coupled Linelevel preamplifier

The maximum unclipped output should be around 25V into 600Ohm and up to 50V into higher loads. Also driving 600 Ohm will not roll of the bass as it will do with most Preamplifiers nor will it unduly increase the Distortion.

http://www.fortunecity.com/rivendell/xentar/1179/projects/euridice/Euridice.html

An experimental RIAA preamp using no capacitors in the direct signal path

The purpose of this report is to describe an experimental RIAA phono preamp that uses several different concepts to derive a high quality RIAA compensated phono preamp.

http://members.aol.com/analogengineer/6gu5ph.html