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Guy Shemesh

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Guy Shemesh last won the day on October 29

Guy Shemesh had the most liked content!

About Guy Shemesh

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  • Website URL
    https://www.ePiccolo.com

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  • Gender
    Male
  • Location
    Israel
  • Interests
    Electronics, embedded software, PCB Design

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  1. Hi Paul Check your VRef circuit around U1, it seems very suspicious to me. To which Vref voltage you are designing for ? I would replace this small circuit altogether.. seems like a mistake in the schematics there. Best of Luck Guy ePiccolo Engineering
  2. Hi, A full diagram would have been more helpful to understand the circuit, with your provided circuit its hard to tell. You need to specify at the very least the other pins 16 and 3 of the TL494. However from the point of connection alone - trimpot touching the 0.1 ohm sense resistors - it looks like current limit control where the trimpot is controlling the current and the MCU setting the high side with GPIO - much like an enable signal. Again without further details I can't tell for sure. Good luck with your studies
  3. Oh! I'm sorry to see this, looks like there is further damage. The caps are severely damaged.. No I would not recommend to try and save this board. I would let it go
  4. Hello Jim, I think the fix would be fairly easy, assuming that P6 is the only diode that got burned. If the failure propagated elsewhere in the circuit there might be more damage but my gut feeling says you have a really good chances here. Looking at the Viper IC I see it is self protected, Overtemperature, overcurrent and overvoltage protection - so I wouldn't bother to replace it. You just need to pick a diode at a rating similar or high to the P6 diode. If you have the exact P/N that would be the best, otherwise just pick a diode with slightly bigger dimensions. Now the tri
  5. By the way, an extremely useful and free tool can be downloaded from here: saturnpcb.com/pcb_toolkit It does require installation on the PC, and it groups many useful PCB calculators in one program. I have no connection to it, other than using it. enjoy
  6. Sounds like you are already on your way 😀 Regarding schematics, some very well known mics have their schematics published, for example you can google "neumann u87 schematic" or "schoeps microphones schematic". The information is there.. I wish you much success with your efforts. Guy
  7. It looks very nice, I also like the layout and the fact you used polygon pours on both sides. I think one improvement would be to make edge plating on the sides, it helps dissipate the heat off the main board. If you can add schematics to the post that would also be interesting to see. Thanks
  8. Hi Peter. It's quite a difficult question to answer, since building microphones can be a full time profession. I'd start with the dynamic microphones first, in these there is usually not much electronics inside - there is the transducer and usually a transformer. So with good hands and a good soldering iron you can probably fix the microphones, i.e if there are loose connections or just swap in replacement parts. Ribbons are also simple in their internals. usually just a thin corrugated foil surrounded by magnets and a transformer. Here also you can fix but you need to be very care
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