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jbozek

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About jbozek

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  1. hi! i would like to share my work with you. i am working on a small susy dynalo but with grlv psu and much better cooling capacity. also i will change the pzta tranzistors with toshiba 2sc2881 and 2sa1201 because they do not heat as much as pzta for some reason, and they are smaller (sot 89). it is a work in progress. for now i only developed an amp (one channel) and psu section without anything else. in following pictures you can see one amp channel and psu with meanwell switchers feeding the grlv (maybe i will put a transformer). bottom side of the pcb has exposed copper (large white s
  2. can i replace jfets with that340 in old dynalo SE circuit without any mods? some resistor are different
  3. do you maybe sell LSK489 / LSJ689 ?
  4. if i have a 50k pot, but need a 10k, can i put a 10k resistor parallel to amp input (or pot output)?
  5. thank you very much, all of you!
  6. can i maybe replace the jfets on original dynalo with that340? and what mods should i do? i think i must tune the ccs, and change pot from 50k to 10k. correct me if i am wrong
  7. i would like to build it, but i am a student so cost is a big problem unfortunately
  8. thank you for your response. maybe i will have the chance to build one someday
  9. yes. it is an old jfet input dynalo. i was lucky to get matched jfet pairs, but they were expensive. i followed the old schematic with tht components, but made some modifications because i used smd components. and my version has slightly more power. power supply is not modded, equivalent smd components are available and i want to ask you something. is there much benefit to using balanced output? lets say i will use this amp only with sennheiser hd650 and it has enough power to drive it and it is completely silent.
  10. biggest reason is cost. i am a student so cost is a problem. second reason, i wanted a somewhat small and compact all in one. maybe in the future i will make a balanced version
  11. Hi! i would like to share my work with you. I made an dynalo amp powered by grlv power supply and a pcm1794a/cm6631a dac. Everything is totaly made by me. I also designed the pcb nd ordered it from JLCPCB. Amp offset voltage stays at max +-1mV and it is totally silent. Case is DOUK AUDIO. pictures: https://drive.google.com/drive/folders/1a6cbGFpN6s5EadR8DA_lb21ZFwOwzK4R?usp=sharing
  12. Hi! i would like to share my work with you. I made an dynalo amp powered by grlv power supply and a pcm1794a/cm6631a dac. Everything is totaly made by me. I also designed the pcb nd ordered it from JLCPCB. Amp offset voltage stays at max +-1mV and it is totally silent. Case is DOUK AUDIO. pictures: https://drive.google.com/drive/folders/1a6cbGFpN6s5EadR8DA_lb21ZFwOwzK4R?usp=sharing
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