Search results for query: Patrick

  1. EUVL

    Very Simple, Almost Universal, Speaker Protection Circuit

    Fran is in the process of building and testing. Only when everything works for him as well before we can release for public use. Thank you for your interest, Patrick
  2. EUVL

    The M2 Output Stage in Class A/B, and maybe a Power WHAMMY?

    Speakers or headphones ? 2x is a bit thin for speakers. Patrick
  3. EUVL

    The Kaneda No.168 Preamp

    ...PM. We shall offer them curve tracer matched at working conditions, to enable you to build 2 channels. The TTC004B and J113 are currently available and can easily be obtained from Mouser, etc. But please wait until Fran has finished the audition this weekend. Thank you for your interest...
  4. C

    Chip Amp For computer speakers

    Hi Patrick is this PCB somewhere announced else? i am interested for a very small stereo amp. thx chris
  5. EUVL

    Mini speaker - Japanese 100 Yen shop "Daiso" - 300 Yen speaker's modified model

    Seems to have quite high distortion ? Patrick
  6. EUVL

    Ikea spherical speakers, first build done.

    Had to try a few before getting the right proportion. Patrick
  7. EUVL

    Folded Cascode CEN IV with fixed Rails

    It may be a slight mismatch of the input JFETs due to specific matching conditions. The 2SJ74 is pretty insensitive to Vds, but the 2SK170 is. You can try changing R3t to see how that affects the input offset. Is the offset positive or negative ? Patrick
  8. EUVL

    Help with W-One ladder relay attenuator remote control

    ...to the green screw terminal for power supply. This jumper should only be in place when you are supplying 5V. If you supply 7V, the jumper should be removed, as it bypasses the on- board 7805. The problem of dealing with AliExpress dealers. You don't get all the information you need. Patrick
  9. EUVL

    The F5 Preamp 2024

    ...months. In the end, he likes it so much that he decides to keep it permanently, with a very decent contribution to our development fund. :giggle: He also wrote a review detailing his own systems, how the F5Pre fits in, and how it compares to the other preamps he has. Worth a read, Patrick .
  10. EUVL

    Ikea spherical speakers, first build done.

    Alpair6 Gen 1. Patrick
  11. EUVL

    Preamp for Hiraga Le Monstr 2024

    Some spice files to play with. Patrick .
  12. EUVL

    Mini speaker - Japanese 100 Yen shop "Daiso" - 300 Yen speaker's modified model

    It sounds good and is loud enough. All that matters. The standard electronics is no use. Much better with a chipamp. Patrick
  13. lineup

    The Kaneda No.168 Preamp

    Nice!
  14. EUVL

    Very Simple, Almost Universal, Speaker Protection Circuit

    The prototypes are tested ok. :giggle: But I only have+/-25V supplies. So Fran will also solder one and test at +/-50V before releasing. Watch this space. Patrick
  15. EUVL

    Hybrid ZEN Amplifier + LM317 = Efficient and simple

    Why not use a single 1084 with cascode. The 1084 does not need much voltage headroom. Neither does the 240. Patrick
  16. EUVL

    Mini speaker - Japanese 100 Yen shop "Daiso" - 300 Yen speaker's modified model

    Seems very popular in Japan. Patrick
  17. EUVL

    Folded Cascode CEN IV with fixed Rails

    I mentioned before that R3t/4t want 3mA minimum. You are using jfets with Idss 8.5/9mA. So you want to have 12mA through R52/62. To understand how current mirror works, please Google. Patrick
  18. C

    Hybrid ZEN Amplifier + LM317 = Efficient and simple

    i guess just for the "normal2 version with "just" 1x LM317. post 97 but no gerber.. for Patricks version with 3x LM317HV.......no
  19. EUVL

    Linear Voltage regulators for power amps...

    This will solve your problem ? https://belleson.com/oc/en-gb/sphp-pos?route=product/product We made our own version, but we don't want to compromise on opamp choices by going to 55V input voltage. Patrick
    • EUVL
    • Post #20
    • Forum: Parts
  20. EUVL

    Group Buy - Very Simple Almost Universal Speaker Protection

    ...and R5/C1. High DC will speed up the former, not the latter. You can if course change all the default values to make one dominant over another. Best is to simulate first in Spice. The values we gave are the values we used ourselves, in multiple projects. So they are good enough for us. Patrick
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