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Simple JFET Audio Preamps - Ciphers By Ritter
http://www.ciphersbyritter.com/RADELECT/PREJFET/JFETPRE.HTM
The N-JFET Audio Preamp Schematic. The input transistor Q2 is an N-channel JFET. Each particular JFET sets a particular output bias voltage, so the JFET must be selected from among multiple devices for the desired bias value. Fortunately, due to the low current involved, desirable devices can come from a wide range of device types.
Audio Amplifiers - JFET - InterFET
https://www.interfet.com/audio-amplifiers/
An All-JFET Amplifier: Exploring Modern JFETs Circuits ...
https://audioxpress.com/article/an-all-jfet-amplifier-exploring-modern-jfets-circuits
The input stage is the complementary JFET differential pair, the second stage is symmetrical differential amplifier with two pairs of opposite polarity JFETs, and the output stage is a complementary source follower. The amplifier can drive loads up to 150 . So, the all-JFET amplifier can be used for various audio applications.
JFETs: The New Frontier, Part 1 | audioXpress
https://audioxpress.com/article/JFETs-The-New-Frontier-Part-1
The basic circuits on which Erno Borbely based most of his projects are described in “JFETs: The New Frontiers, Part I and II,” published in Audio Electronics AE 5/99 and 6/99. Referring to these articles frequently, the author admits, these were the “building blocks” on which many - if not all - of his amplifiers are based. This article is the first part, as originally published …
Audio Compression Amplifier /AGC - ElectroSchematics.com
https://www.electroschematics.com/audio-compressor-agc/
This is an audio compressor/AGC (automatic gain control) with an astonishing 75db input voltage range. A P-Channel JFET is used as a variable resistance element that is applied as a variable attenuator. Distortion is minimized by keeping the signal voltage across the JFET extremely low (1.3mV). This is an improvement over similar circuits that ...
How to design JFET as an amplifier? - Circuit and ...
https://electronicscoach.com/jfet-as-an-amplifier.html
It consists of N-channel JFET, a capacitor, AC signal input, a load resistor and battery to supply gate to source voltage. More precisely, the battery here is used for providing a reverse bias to the input circuitry. Working. The working procedure of JFET as an amplifier can be easily conceived even if we know a little about vacuum tube.
Simple Audio Circuits - Making Easy Circuits
https://makingcircuits.com/blog/audio-amplifier-circuits-using-fet/
Video Amplifier. From Figure 2.15, you can see the circuit of typical video amplifier utilising a sole 2N3819 FET. The circuit delivers a voltage gain of 5: the maximum signal input before output-peak clipping, at 1 MΩ load, is 0.6 V rms for 3 V rms output. For increasing gain, you may cascade the stages.
MOSFET AUDIO AMPLIFIER(Low Noise and High Gain) : 6 …
https://www.instructables.com/MOSFET-AUDIO-AMPLIFIERLow-Noise-and-High-Gain/
"An audio power amplifier (or power amp) is an electronic amplifier that strengthens low-power, inaudible electronic audio signals such as the signal from radio receiver or electric guitar pickup to a level that is strong enough for driving loudspeakers or headphones.". This includes both amplifiers used in home audio systems and musical instrument amplifiers like guitar amplifiers.
KR1S Medium Wave FET Regen
http://qrp.kearman.com/html/mwregen01.html
The added FET helped drive an LM386 amplifier directly, with the audio-gain control connected across its output (through a 0.1-uF capacitor), for headphone-level listening. I wanted more gain than the LM386 audio amp (a noise generator all its own!) could provide.
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