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Showing content with the highest reputation on 03/14/2019 in all areas

  1. I am moving Kerry's mini GRHV\GRLV GB discussion to its dedicated thread here. I also included JoaMat's mini T2 here to see if we have enough interest for a GB. The table will be updated periodically as more people participate. Apologize if I missed someone or something - just let me know so I can correct the data. I put down one set for those that have not decided on the number of sets they want. The plan is to have assembled GRHVxxx boards, rest of boards will be PCB only. See discussions on the PS in this thread. mini T2 build discussion in this thread. Construction notes: R3 and R2 determine the regulated voltage for GRLV. The formula is Vout = (R2 + R3)/R3 * Vref. Vref is the reference voltage of U4 (LT1021). R7, R8, R9, R10 determine the regulated voltage for GRHV. The formula is Vout = ((R8 +R9 + R10)/R7 + 1) * Vref. Vref is the reference voltage of IC1 (LT1021). You want to keep R8, R9 R10 values close so they have even voltage drop across each of them. On the PSU Main board, R22 (100K) and C17 (470uf) set up the delay time for HV. The 100k/470uf combination provides a roughly 45 seconds delay. Increase R22 or C17 to increase the delay time. C17 needs to be rated 5VDC or higher. Board dimensions: mini T2: 160mm x 100mm GRHVxxx: 41mm x 31mm GR78xx/GR79xx: 30mm x 20mm Main board (PSU): 140mm x 90mm See BOM for boards at the bottom. Blank in the GRHVxxx-bare column indicates that the participant has not responded on this thread to indicate the preference for bare or partially-assembled boards and is deemed to opt for partially-assembled board by default as previously communicated. BOM: GRHV78xxx-BOM.xlsx miniT2v.22_Date_2020-02-16.xls GR78xx - V2 .xlsx GRHVBase-BOM - V2 production.xlsx GR79xx-V2.xlsx
    4 points
  2. ^ It was a pleasure meeting you for lunch, my friend! Hearing about the trip was as much fun as seeing the pictures.
    2 points
  3. Titular Burger Italian Pork Sandwich
    2 points
  4. The driver looks very well built. I'll get a pair too.
    1 point
  5. So much pressure!!!
    1 point
  6. Searching for an interesting hot sauce as a gift for a friend, came across this, and had to buy a bottle for myself!
    1 point
  7. I've tested this supply and it works nicely
    1 point
  8. Proof that FR graphs are useless as we all know?
    1 point
  9. Well, I rather not make recommendations but I would go for +400V/-460V and add one 20K/3W resistor on each board between +220V and +400V pads. I think I want something like this… ...for power supply.
    1 point
  10. Back from skiing. Zoom in on the Vishay CPF3 resistor and you can read 20K. 400 volts in at the blue wire. The meter is in Min Max mode and it went up to 225.5 V at start up and then immediately down to what you see in Picture. Seems to work. I’ll change the other channel and will test this for some time. I have run the amplifier on a unchanged T2 PSU with +/-500 V and +250 V for a while and that also seems to work alright. Edit: Both channels now with 20K resistors to achieve the +220V. 220.3V respective 219.6V with PSU +400V trimmed to 401.9V on the clocks.
    1 point
  11. Have some from PCBNet, 1.6mm and 3oz. Anyone who wants to build the Transconductance amp and post a few pics here, can have a set or two. Promise to show a few pics of the build here, and I'll cover the shipping as well ?
    1 point
  12. Yeah, but does it work with Spotify?
    1 point
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