Jfet problems and solutions

Posted on 27 February 2017

Simplistic NJFET RIAA - diyAudio - Home Forums Source Line Analogue Simplistic NJFET RIAA User Name Stay logged Password Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Community Search Turntables Tonearms Cartridges Phono Stages Tuners Tape Recorders etc. AMZFX Home Page Lab Notebook Main Guitar Effects Blog Jack Orman All Rights Reserved Privacy Policy. Salas View Public Profile Send private message to Find More Posts by September AM diyAudio Chief Moderator Join Date Oct Location AthensGreece Quote Originally posted Bonsai if you want something simple and reliable with adequate performance just use good quality opamp like . Quack Envelope Filter. As shown to the left resistor capacitor network provides reference voltage that may be used bias transistor opamp into best operating range

I just have SKBL left overs from my recent DC coupled Pass version and am monkeying around bit. Voltage divider biasing is also possible with the opamp and input impedance calculated same way transistor versions similarly biased. Will it work at all Build guide MC MM older version FSP reportMC onlyhardwired Official PCB How works schematic description Attached Images . Salas View Public Profile Send private message to Find More Posts by September PM diyAudio Chief Moderator Join Date Oct Location AthensGreece saw that link some put first stage second coupling capacitor after passive RIAA and say they got better subjective performance

Bb-D1 DIY Active DI Kit with Jfet Input | Bumblebee Pro

An alternate configuration is shown here that uses the voltage bias input same manner second jfet example above. The disadvantage lower input impedance available as compared to fets. I am not asking for very good performance. I will have to listen for that position exchange. As shown to the left resistor capacitor network provides reference voltage that may be used bias transistor opamp into best operating range. To argue with person who has renounced the use of reason is like administering medicine dead omas Paine kevinkr View Public Profile Send private message Visit homepage Find More Posts by September PM nicoch diyAudio Member Join Date Oct mad ska optvol good sound for will try first stage ground lower second armonic dist

Onboard JFET Preamp - Albert Kreuzer

I guess because they mainly small ones and response is linear after RIAA stressing less. Please consider donating to help us continue serve you. what I found lakeville mn car dealerships that this simple phone are very sensitive dr anna mirski to quality component for now use all dale rn non magnetic riaa caps vishay MKP series nf clarity Sa mf outcaps mundorf silveroil without parrallel psu near jfet will order more exotic part and report circuit not so good mm because have higth input capacitance pf mv Iuse denon dl mc nicoch View Public Profile Send private message Find Posts by September PM Salas diyAudio Chief Moderator Join Date Oct Location AthensGreece Quote Originally posted kevinkr Take look Richard Sears phono stage design works well sounds pretty . I typically Marona mia use jfets on inputs and bipolars for output buffers where their better drive characteristics are needed. The gain is unity and set by R . I did not see Rsource bypassing for more gain do aspire though. I just have SKBL left overs from my recent DC coupled Pass version and am monkeying around bit

At v there is possibility of battery and use small series caps. AMZFX Home Page Lab Notebook Main Guitar Effects Blog Jack Orman Rebelution good vibes acoustic All Rights Reserved koons locksmith cape coral Privacy Policy. Very effective. An alternate configuration is shown here that uses the voltage bias input same manner second jfet example above

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The gain is unity and set by R . Input impedance is approximately the value of . I have some Dynavector dB silver step up if things prove difficult

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Please consider donating to help us continue serve you. The Vr point on this circuit connects to a bias voltage source shown first paragraph

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The input impedance is value of R paralleled by or k ohms this example but you could easily increase their values to maintain Z. This the buffer used in TSseries distortion boxes

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To argue with person who has renounced the use of reason is like administering medicine dead omas Paine kevinkr View Public Profile Send private message Visit homepage Find More Posts by September PM nicoch diyAudio Member Join Date Oct mad ska optvol good sound for will try first stage ground lower second armonic dist. This an excellent addition in front of vintage wahwah or other circuit that can rob signal high frequency response

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To argue with person who has renounced the use of reason is like administering medicine dead omas Paine kevinkr View Public Profile Send private message Visit homepage Find More Posts by September PM nicoch diyAudio Member Join Date Oct mad ska optvol good sound for will try first stage ground lower second armonic dist. The gain is unity and set by R . I guess that my experiment to be falls in class

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KB views Salas Public Profile Send private message to Find More Posts by September AM Bonsai Account disabled member request Join Date Jul Location Europe if you want something simple and reliable with adequate performance just use good quality opamp like . It also has the lowest parts count of any simple buffers presented here

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What I found that this simple phone are very sensitive to quality component for now use all dale rn non magnetic riaa caps vishay MKP series nf clarity Sa mf outcaps mundorf silveroil without parrallel psu near jfet will order more exotic part and report circuit not so good mm because have higth input capacitance pf mv Iuse denon dl mc nicoch View Public Profile Send private message Find Posts by September PM Salas diyAudio Chief Moderator Join Date Oct Location AthensGreece Quote Originally posted kevinkr Take look Richard Sears phono stage design works well sounds pretty . An opamp is even better buffer amplifier though many believe they are somewhat colder sounding and more sterile than transistor versions

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Input impedance is again approximately the value of . The point marked Vr is connected to also notated as buffer schematic. e sufficent for dl nicoch View Public Profile Send a private message to Find More Posts by Page Last Previous Thread Next Tools Enhanced Print Regular Search this Advanced Posting Rules You may not new threads replies attachments edit your BB code On Smilies are IMG HTML Off Forum Jump User Control Panel Messages Subscriptions Who Online Forums Home Site Announcements Problems Amplifiers Solid State Pass Labs Tubes Valves Chip Amps Class Power Supplies Headphone Systems Source Analogue Level Digital PC Based Loudspeakers MultiWay Full Range Subwoofers Planars Exotics Live Sound Instruments and Design Build Parts Equipment Construction Tips Software General Interest Car Audio diyAudio Articles Music Everything Else Member Areas Introductions The Lounge Clubs Events Memoriam Moving Image Commercial Sector Swap Meet Group Buys Store Vendor Bazaar Sonic Craft Apex Jr Acoustic Fun Chipamp HiFi Supply Elekit Elektor Mains Cables Connexion Planet Quanghao Siliconray Electronics Tubelab Manufacturers AKSA Poutine Musicaltech Holton Precision CSS Dx Classic exaDevices Feastrex GedLee HiFiWalter Heatsink USA miniDSP SITO Twin Twisted Pear Wild Burro Need Help Register Participate Privacy Statement Contact Frequently Asked Questions Did forget password Mark All times GMT

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Salas View Public Profile Send private message to Find More Posts by September PM diyAudio Chief Moderator Join Date Oct Location AthensGreece saw that link some put first stage second coupling capacitor after passive RIAA and say they got better subjective performance. The point marked Vr is connected to also notated as buffer schematic. Mosfets have high capacitances between its electrodes and though there is no Miller Effect to multiply those their value can nonetheless enough cause frequency rolloff depending characteristics individual transistors

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Ads on off Custom Title More PMs album space Advanced printing Last Thread Tools Search this nd September AM Salas diyAudio Chief Moderator Join Date Oct Location AthensGreece Simplistic NJFET RIAA Hello people. Salas View Public Profile Send private message to Find More Posts by September PM kevinkr diyAudio Moderator Join Date Location Boston Massachusetts Take look Richard Sears JFET phono stage design works well and sounds pretty good

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This an excellent addition in front of vintage wahwah or other circuit that can rob signal high frequency response. I am not asking for very good performance

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If you substitute a mosfet transistor into the circuit of last example and tweak source gate resistor values essentially AMZ Booster buffer mode. Community Links Social Groups Members List Search Forums Show Threads Posts Advanced Google Wiki Pages Discussions to

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Buffers are simple easy and cheap to construct. Probably the easiest buffer is basic jfet common drain amplifier. Battery power works well with them but if used an AC adapter must be filtered and humfree noise will combined signal

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What I found that this simple phone are very sensitive to quality component for now use all dale rn non magnetic riaa caps vishay MKP series nf clarity Sa mf outcaps mundorf silveroil without parrallel psu near jfet will order more exotic part and report circuit not so good mm because have higth input capacitance pf mv Iuse denon dl mc nicoch View Public Profile Send private message Find Posts by September PM Salas diyAudio Chief Moderator Join Date Oct Location AthensGreece Quote Originally posted kevinkr Take look Richard Sears phono stage design works well sounds pretty . Community Links Social Groups Members List Search Forums Show Threads Posts Advanced Google Wiki Pages Discussions to . The basic jfet buffer shown in last paragraph may be improved upon by connecting gate resistor bias voltage instead of ground

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SRPP to drive the properly impedance sized RIAA BJT follower for output. I will have to listen for that position exchange