UltraLow Noise, 2.4GHz Gain Bandwidth Large-Area Photodiode Amplifier - The combination of the ultralow noise JFET gain stage and the LT1806 low noise amplifier achieves the ultralow input noise performance. The circuit’s input voltage noise was measured at 0.95nV/rtHz. __ Linear Technology/Analog Devices App Note, Mar 22, 2010
Ultrapure 1kHz Sine Wave Generator - A lamp provides amplitude stability while the very low noise amplifier creates a pure sine wave signal. The R an C values set the oscillator frequency and the feedback resistor sets the lamp current and output amplitude. __ Linear Technology/Analog Devices App Note, Jun 21, 2011
Umble-A distortion stompbox, inspired by Dumble Amplifiers. Schematic & PCB/perfboard layouts. - A distortion stompbox, inspired by Dumble amplifiers. __ Contact: holler @ runoffgroove.Com
Uno-The Boogie MkI - One of the first amps to offer distortion at lower volumes was the Boogie MkI amplifier. As told by Randall Smith, the designer of the Boogie amp, these amplifiers were born of a practical joke on a guitarist friend. Mr. Smith modified a Fender Princeton to have considerably more gain and power, but appear stock. As the story goes, Carlos Santana play-tested the amp and was impressed. Carlos was quoted as saying the amp "really boogied!" Thus, the name of the amp was born. __ Contact: holler @ runoffgroove.Com
Use Resistor Noise to Characterize a Low-Noise Amplifier - 06/23/11 EDN-Design Ideas Measure gain or noise with an AC voltmeter. If you know or can estimate a low-noise amplifier’s gain or noise bandwidth, you can measure the other spec using only a handful of resistors and an ac voltmeter (Reference 1). The method in this Design Idea uses the Johnson Equation, which describes the amount of noise a resistor generates (Reference 2). To find the missing parameter, measure an amplifier’s output-noise voltage, first for a shorted input and then using a few resistors of different values. You can download an Excel spreadsheet that can calculate gain or noise bandwidth here. Design by Joe Geller, Whitesboro, NY
Using All four Amplifiers of the LT1397 to Drive Large zCapacitive Loads - Four paralleled amplifiers increase load capacitor current drive capability. A small ballast resistor at each output increases isolates the effects of each amplifier's different output offset. __ Linear Technology/Analog Devices App Note, Jun 29th 2012
Using an old Computer Box to build a guitar Amplifier - In the event of the new ATX computer boxes, the former boxes for PC will become and are becoming obsolete. It is almost unimaginable how many unused computer boxes will be unused or trashed very shortly in history. That's a lot of metal. They will be and are already common articles in junk shops, flee markets and garage sales. __ Designed by Jon Tirone, AKA John Fisher
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