sp300b Napisano Novembar 3, 2010 Share #529 Napisano Novembar 3, 2010 ... Best solution up to now, but commonly not recommended, no pre at all, only shunt attenuator 10k with Charcroft foils in the signal path and short cables to J2.................. simply marvelous! Most natural sound! May be bass is not totally precise, but all colors of sound are much better, which is more important to me. I suppose the high input impedance of J2 (220k balanced) and the high gain (20db) and as Zen Mod wrote, the very small input capacitance of J2 makes this direct solution possible. I recommend to try this possibility also ............... when you have your building of J2 finished. :headphone: Hello Generg, Better than this ? Link to comment Podeli na ovim sajtovima More sharing options...
AR2 Napisano Novembar 3, 2010 Share #530 Napisano Novembar 3, 2010 A few tips to J2 builders that might help you in your quest... • Definitely install protection Zeners, do not omit them "for the better sound" • Make sure that your Voltage across LED string measured to ground is around 12V. With my LEDs that I purchased brand new from Mouser, 20mA each, I was measuring 17V! Ended up removing two in order to get the right voltage. • Have closely MATCHED Semi South jFets, will make your life much easier After that, Dolce Vita Link to comment Podeli na ovim sajtovima More sharing options...
generg Napisano Novembar 3, 2010 Share #531 Napisano Novembar 3, 2010 Hello Generg, Better than this ? Hi sp300b, the "poor serbian mans" solution, I don´t have it. I tried the unbalanced, normal version from the DIYforum some months ago with BA-1 and F$ and I liked more my stepped attenuator.But the luxury version of Zen Mod and balanced could be a very good choice, did you hear it already with your J2? Link to comment Podeli na ovim sajtovima More sharing options...
generg Napisano Novembar 3, 2010 Share #532 Napisano Novembar 3, 2010 A few tips to J2 builders that might help you in your quest... • Definitely install protection Zeners, do not omit them "for the better sound" • Make sure that your Voltage across LED string measured to ground is around 12V. With my LEDs that I purchased brand new from Mouser, 20mA each, I was measuring 17V! Ended up removing two in order to get the right voltage. • Have closely MATCHED Semi South jFets, will make your life much easier After that, Dolce Vita Thanks AR2 I will look for the voltage and install the Zeners! Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Novembar 3, 2010 Share #533 Napisano Novembar 3, 2010 Hi sp300b, the "poor serbian mans" solution, I don´t have it. I tried the unbalanced, normal version from the DIYforum some months ago with BA-1 and F$ and I liked more my stepped attenuator.But the luxury version of Zen Mod and balanced could be a very good choice, did you hear it already with your J2? Not yet....I'm using it with Babelfish.Thanks to AR2 for advices Link to comment Podeli na ovim sajtovima More sharing options...
Tea-Bag Napisano Novembar 3, 2010 Share #534 Napisano Novembar 3, 2010 Not yet....I'm using it with Babelfish.Thanks to AR2 for advicesAnd PSM OB? Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Novembar 3, 2010 Share #535 Napisano Novembar 3, 2010 And PSM OB? Balanced PSMLS with modified buffer stage Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Novembar 3, 2010 Share #536 Napisano Novembar 3, 2010 So, Let's the party begin Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Novembar 3, 2010 Share #537 Napisano Novembar 3, 2010 In my case: All PNP transistor used are type BC560C Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Novembar 5, 2010 Share #538 Napisano Novembar 5, 2010 LTP Jfets selected and put in their position.Termal paste and heat shrinking tube Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Novembar 5, 2010 Share #539 Napisano Novembar 5, 2010 and some more parts soldered Link to comment Podeli na ovim sajtovima More sharing options...
AR2 Napisano Novembar 6, 2010 Share #540 Napisano Novembar 6, 2010 LTP Jfets selected and put in their position. Termal paste and heat shrinking tube Uhhhh, jFet manijak Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Novembar 6, 2010 Share #541 Napisano Novembar 6, 2010 Uhhhh, jFet manijak Somebody (JFet) likes it (constantly) Hot Link to comment Podeli na ovim sajtovima More sharing options...
generg Napisano Novembar 6, 2010 Share #542 Napisano Novembar 6, 2010 These JFets are female they like the treatment at the hairdresser ........ I am so eager to hear your impression sp300b........!Do you still hear your Sonido BLH with the 144 driver? Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Novembar 6, 2010 Share #543 Napisano Novembar 6, 2010 These JFets are female they like the treatment at the hairdresser ........ I am so eager to hear your impression sp300b........!I already know it will be superb....Do you still hear your Sonido BLH with the 144 driver?Yes, I do. Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Novembar 6, 2010 Share #544 Napisano Novembar 6, 2010 First PCB is almost let's say TEST READY :to_become_senile:p.s. I hate 3mm LED, so I (always) use 5mm LED Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Novembar 6, 2010 Share #545 Napisano Novembar 6, 2010 One more picture Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Novembar 6, 2010 Share #546 Napisano Novembar 6, 2010 And prove that I'm listening good advices :hi:Safety Zeners.... Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Novembar 6, 2010 Share #547 Napisano Novembar 6, 2010 ZM, please, take a look and approve this Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Novembar 6, 2010 Share #548 Napisano Novembar 6, 2010 And prove that I'm listening good advices Forgot to mention 100 Ohms for Gate Stoppers, too ;-) Link to comment Podeli na ovim sajtovima More sharing options...
generg Napisano Novembar 6, 2010 Share #549 Napisano Novembar 6, 2010 100 Ohm is not a must ....ZM advice is starting with 47Ohm and going up and let the ears decide......A good start for you and the gorgeous Sound for you we heard..... Link to comment Podeli na ovim sajtovima More sharing options...
Zen Mod Napisano Novembar 6, 2010 Autor Share #550 Napisano Novembar 6, 2010 ZM, please, take a look and approve this yes!especially that part about Philips 12" Link to comment Podeli na ovim sajtovima More sharing options...
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