Search results for query: Patrick

  1. M

    Unity gain inverting amplifier/buffer

    Thanks Patrick, I will think about it.
  2. EUVL

    Measuring Distortion on the Cheap

    But we use the Viktor balanced as source most of the time. Patrick
  3. EUVL

    Very Simple, Almost Universal, Speaker Protection Circuit

    Please be patient with us for a little while. We want to make things perfect. For example whether to include the SMD MOSFETs already soldered on the boards. They are a bit tricky to hand solder. But thank you for your interest, Patrick
  4. C

    Help with W-One ladder relay attenuator remote control

    Hi Jim, firstly to make things clear. I am no way affiliated to the aliexpress shop nor the original designer. I am a friend of Patrick who has helped Patrick communicate and purchase of the said step pots used in his Pre-Amps, even requested for custom firmwares. From my communication with...
  5. EUVL

    Very Simple, Almost Universal, Speaker Protection Circuit

    Many many thanks to Fran again who has been testing the latest version in his F5EXC with +/-50V rails over many evenings. He also repeated the trigger timing test multiple times at +/-12V, +/-25V and +/-50V to confirm that they are consistent with the design values. Patrick
  6. EUVL

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

    There is a horn kit being sold in Japan for the Daiso as well : https://www.fromjapan.co.jp/japan/jp/auction/yahoo/input/j1120985090/ Seems the Daiso is crazy popular there. Patrick
  7. EUVL

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

    It depends on the sound level of course. And he is probably using the original amplifier. The drivers are good enough for full range at near field, for me. Just need bass boost. Patrick
  8. EUVL

    Ikea spherical speakers, first build done.

    This has been the temporary solution for the last two years. Patrick .
  9. EUVL

    BRZHiFi 5V 1A "Audiophile Grade" Portable Linear Power Supply Review

    KiCAD is free, not ? Patrick
  10. EUVL

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

    The S track is important. You can make it wider. Patrick
  11. EUVL

    GB for Hiraga Le Monstre 2024

    No issue. Patrick
  12. EUVL

    All Hitachi Lateral FET amplifier for DIY described by Paul Kemble

    ...now built the BJT front end version exactly according to data book. We shall build the all FET version, thoroughly test both, and release details in a new thread when ready. We shall stick to the original as much as possible, and make no attempts to "improve" the original circuits...
  13. EUVL

    Are there any excellent inexpensive Chinese DACs?

    One of the very few posts in this thread which is relevant to the title. (y) Patrick
  14. triode_al

    An F5 with laterals

    Patrick, I bought a stash of these 2sk175 + 2SJ55 Toshiba's when I worked in Canton. I totally agree; your schema is in fact an integration of F4 with F5 as driver. i like that. Great. Bien conçu.
  15. EUVL

    Group Buy - Very Simple Almost Universal Speaker Protection

    ...dominant over another. If you reduce C1 by 10x, and increase R1,2 by 2~3x, the delay by R5/C1 is reduced by 10x, and the triggering time will be almost entirely dependent on the input DC voltage. The minimum trigger DC voltage is approximately : 1.2V + (0.05mA) X (R1 + R2 + R11 + R12) Patrick
  16. EUVL

    An F5 with laterals

    Try FQP3N30/3P20 for Q26,27. You will need to adjust R72/74 for proper biasing of the second stage. For 4 ohm load, I would use at least 4 output pairs and 2A bias. Will only give you 32Wrms class A. Patrick .
  17. EUVL

    MJL21193/94 replaced mica insulator with silicone and now a hum and DC

    2mm thick mica ? Patrick
  18. mabat

    Acoustic Horn Design – The Easy Way (Ath4)

    I'll look at this.
  19. A

    Featherweight Title Fight

    I did
  20. EUVL

    Very Simple, Almost Universal, Speaker Protection Circuit

    Yes, because the switching is done at a MOSFET gate which is on at ~2V. The optocoupler used has a saturation voltage of maximum 0.4V. Patrick
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