From low to high power and tube based audio amplifier

Electronics Infoline Web

LM386 Bench Amplifier

A small 325mW amplifier with a voltage gain of 200 that can be used as a bench amplifier, signal tracer or used to amplify the output from personal radios, etc. The circuit is based on the National Semiconductor LM386 amplifier.

http://www.zen22142.zen.co.uk/Circuits/Testgear/benchamp.htm

A4 Power Amplifier

This amplifier uses four LM4780s working in inverted parallel mode. Each of these offers around 50 watts into 8 ohms, but are capable of delivering significant peak currents into lower impedances. A large custom made torroidal transformer forms the heart of the amplifier, designed with a low flux density for reduced mechanical noise, and incorporating an electrostatic screen to attenuate interference.

http://www.mhennessy2.f9.co.uk/a4/index.htm

Additional RFI Protection for Line Input Circuits

Additional RFI Protection for Line Input Circuits Diagram and components.

http://www.jensen-transformers.com/as/as072.pdf

Build a Tape Linearizer and a Distortion Analyzer

No sane recording engineer would ever add distortion to a program intentionally - unless, of course, the goal was to increase headroom and lower tape distortion. Not talking about a new type of sonic exciter, but a well-known and accepted method to counteract the onset of saturation in analog recording tape.

http://www.ethanwiner.com/distort.html

Coaxial output page

The complete schema is drawn above (click on it for a real size image). I builded and tested it in this form. Some parts are optional or do not apply (it is an adaption of the SCMS-killer circuit).

http://www.xs4all.nl/~fjkraan/digaud/dtc790/coax.html

Defeat SCMS page

I modified a Sony DTC790 DAT recorder using a circuit designed for recorders with a CXD2601 chip. This schematic can be found at DAT heads home page, and with more info on Philipp Borns page.

http://www.xs4all.nl/~fjkraan/digaud/dtc790/defscms.html

Electronic projects by Roberto Barrios

Welcome and thanks for your interest. Here you will find info on practical projects I have designed and or built. I try not to reproduce here information that is already available somewhere else.

http://www.qsl.net/eb4eqa/