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.
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.
Additional RFI Protection for Line Input Circuits Diagram and components.
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.
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).
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.
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.
External Isolation Transformer Box for Mackie (and other) Mixers Eliminates RFI Problems.
JT-11-FL Isolates and Converts Guitar Amp Speaker Out to Line Output.
JT-11B-1 plus Phantom Buffer Provide Balanced Guitar Output.