sp300b Napisano Novembar 6, 2010 Share #551 Napisano Novembar 6, 2010 100 Ohm is not a must ....ZM advice is starting with 47Ohm and going up and let the ears decide......ZM don't know Link to comment Podeli na ovim sajtovima More sharing options...
Zen Mod Napisano Novembar 6, 2010 Autor Share #552 Napisano Novembar 6, 2010 ZM weiß Bahnhof:Viannen_loungelizard: Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Novembar 6, 2010 Share #553 Napisano Novembar 6, 2010 Test Setup connected, Concept is Working and here comes the measurements done tonight. Seems to be very stable, On osciloskope over 100 KHz there is no problem with Square input. Additionall small tweeking of the elements seems to be required.... for ZM - I didn't changeR25 trimmer from the starting position. edit : schm deleted by ZM Link to comment Podeli na ovim sajtovima More sharing options...
Zen Mod Napisano Novembar 6, 2010 Autor Share #554 Napisano Novembar 6, 2010 Test Setup connected, Concept is Working .........:buehehe:you have doubts ? ........Seems to be very stable, On osciloskope over 100 KHz there is no problem with Square input............and even more , at least with my parts/outputs/gate resistorsI have some notes in my workshop , along with CRO screenshots , but they're completely boring - nothing to write home about .........Additionall small tweeking of the elements seems to be required....for ZM - I didn't changeR25 trimmer from the starting position.whatever it needs ; these Jfets are trickier to set , comparing to big ole mosfets , due to smaller Ugs .... and wild xconductance ; but - as I said before - nothing to worry aboutplain boring amp - to make Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Novembar 6, 2010 Share #555 Napisano Novembar 6, 2010 I've just started playing with this toy....Myth will be 100 % Busted in a coming days Link to comment Podeli na ovim sajtovima More sharing options...
Zen Mod Napisano Novembar 6, 2010 Autor Share #556 Napisano Novembar 6, 2010 I like that ........ sp300b & ZM ........ Mythbusters and - one member on Big Diya Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Novembar 6, 2010 Share #557 Napisano Novembar 6, 2010 I like that ........ sp300b & ZM ........ Mythbusters and - one member on Big Diya Yea, One really BIG FuLLrange man Link to comment Podeli na ovim sajtovima More sharing options...
Zen Mod Napisano Novembar 6, 2010 Autor Share #558 Napisano Novembar 6, 2010 Yea, One really BIG FuLLrange man http://www.diyaudio....-spavleski.html"Spavleski" Slobodan Pavleski is an electronics engineer and his professional bio is even longer than this article! He is 42 years old, audio and music are his hobby and ZM sez: “One hell of an engineer!” Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Novembar 6, 2010 Share #559 Napisano Novembar 6, 2010 Busted ! Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Novembar 7, 2010 Share #560 Napisano Novembar 7, 2010 Here comes Schematic Nomenclature according to my PCB edit : schm deleted by ZM Link to comment Podeli na ovim sajtovima More sharing options...
Zen Mod Napisano Novembar 7, 2010 Autor Share #561 Napisano Novembar 7, 2010 yup - nomenclature made by mistake of pcb maker:rofl: Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Novembar 7, 2010 Share #562 Napisano Novembar 7, 2010 Here comes Schematic Nomenclature according to my PCBAnd according to previous picture, here comes where to measure Link to comment Podeli na ovim sajtovima More sharing options...
Zen Mod Napisano Novembar 7, 2010 Autor Share #563 Napisano Novembar 7, 2010 :connie_nutzo:taking in account that just 6 pairs are made ....... and that's probably all what will be made:cheers: Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Novembar 7, 2010 Share #564 Napisano Novembar 7, 2010 :connie_nutzo:taking in account that just 6 pairs are made ....... and that's probably all what will be made:cheers:Anyhow, Do you agree with a measurement points shown previously (where and how) ? Link to comment Podeli na ovim sajtovima More sharing options...
Zen Mod Napisano Novembar 7, 2010 Autor Share #565 Napisano Novembar 7, 2010 yes , indeed .......... certainly ...... why not ........ how else .......... Link to comment Podeli na ovim sajtovima More sharing options...
Magura Napisano Novembar 7, 2010 Share #566 Napisano Novembar 7, 2010 Anyhow, Do you agree with a measurement points shown previously (where and how) ? Now that I've spent a lot of time tuning the Donuts, one thing I learned was that next time I make a PCB, I will make pads for measuring points. You seem to have plenty of room for that (so did I, but did not think of it back then).Magura Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Novembar 7, 2010 Share #567 Napisano Novembar 7, 2010 Now that I've spent a lot of time tuning the Donuts, one thing I learned was that next time I make a PCB, I will make pads for measuring points. You seem to have plenty of room for that (so did I, but did not think of it back then).Magura Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Novembar 7, 2010 Share #568 Napisano Novembar 7, 2010 Some more thinking given as comments in red edit : schm deleted by ZM Link to comment Podeli na ovim sajtovima More sharing options...
Sipi Napisano Novembar 7, 2010 Share #569 Napisano Novembar 7, 2010 Slobo, zaista je nesto manji napon na R69 - probaj da stavis manji R70 (recimo 1k), ili je Q26 malo van specifikacije (mada ne bi smelo tol'ko)... Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Novembar 7, 2010 Share #570 Napisano Novembar 7, 2010 If You have Vgs measured as 1,32V at 2A, then expect Vgs+Rds to be around 2,4V, not 2,7V.... Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Novembar 7, 2010 Share #571 Napisano Novembar 7, 2010 Slobo, zaista je nesto manji napon na R69 - probaj da stavis manji R70 (recimo 1k), ili je Q26 malo van specifikacije (mada ne bi smelo tol'ko)...Hvala sipi...Ja sam svuda umesto 12K stavio 15K...verovatno je tu zez....Mozda promenim sva3 komada na 10K. Link to comment Podeli na ovim sajtovima More sharing options...
Sipi Napisano Novembar 7, 2010 Share #572 Napisano Novembar 7, 2010 Stavi i manje (1k) jer taj otpor limitira struju kroz bazu Q27 i kolektor Q26 - sa tako visokom vrednoscu R70 kroz Q26 jedva teku neki tanki mikroamperi a posto ima visok beta faktor naravno da ce Vbe biti jako mali. Link to comment Podeli na ovim sajtovima More sharing options...
Preporučeni Komentari
Kreiraj nalog ili se prijavi da daš komentar
Potrebno je da budeš član DiyAudio.rs-a da bi ostavio komentar
Kreiraj nalog
Prijavite se za novi nalog na DiyAudio.rs zajednici. Jednostavno je!
Registruj novi nalogPrijavi se
Već imaš nalog? Prijavi se ovde
Prijavi se odmah