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Recent content by jumpjack

  1. J

    Tuning DC1924 and DC2009 demo boards from Linear for Buck/Boost DC/DC conversion

    So just replacing an output mosfet by, say, 10 mosfets in parallel to carry 10X current is not feasible?
  2. J

    Tuning DC1924 and DC2009 demo boards from Linear for Buck/Boost DC/DC conversion

    No answers? Nobody working with buck and boost converters here? :sad:
  3. J

    Cascading two different dc-dc converters

    Could you please be more specific? I don't understand from datasheet if, to reach 100A, I need multiple DC1924 developer boards in parallel, or if adding multiple mosfets in parallel is enough. I also can't understand if the board and/or the chip are bidirectional as I need: if I get 60V from 3V...
  4. J

    Cascading two different dc-dc converters

    I found something very interesting from Linear Technologies! https://www.edaboard.com/threads/295163/
  5. J

    Tuning DC1924 and DC2009 demo boards from Linear for Buck/Boost DC/DC conversion

    Linear Technologies has two interesting demo boards to manage buck/boost DC/DC conversion: DC1924 (LT8705 based): input 36-80V, output 48V/5A DC2009 (LT3791 based): input 12-58V, output 24V/5A Actually LT8705 has 3-80V input and 2-80V output and can handle up to 250W LT3791:5-60V, 2-60V, ? W I...
  6. J

    Cascading two different dc-dc converters

    Digging up this old thread because I have a DC/DC cascading issue too: I need a DC/DC converter capable of turning 30-70V into 60V constant... but with up to 100A output! (It's for an electrich vehicle). I can't find any suitable ready-made circuit for such an application. Can small DC/DC...
  7. J

    DC/DC converter: 0-60V to 60V

    So? Suggestion? How can I determine which coils and capacitors to buy? How would frequency and voltage range reduction affect circuit complexity?
  8. J

    DC/DC converter: 0-60V to 60V

    I want to add ultracapacitors to the battery pack of my scooter. Scooter has 1500W/60V motor and 60V battery. I'd just need, for now, 2 seconds of high energy. How can I build, or where can I buy, a DC/DC converter capable of using whole voltage range of a 60V ultracap (0-60V) to give a...
  9. J

    how to input I/Q signal to soundcard for DSP

    I just found out that my PC audio card is capable of sampling up to 3MHz sampling frequency 8O . And I think I cuoudl even put it over this value . Although it's useless for sound sampling, it's very useful to use audio card as an oscilloscope... but I'm currently using Audacity, an audio...
  10. J

    Sending data from weather station to PC

    I bring up this old thred because I successfully sniffed and decoded signals sent by an Oregon Scientific wireless temperature sensor: ImageShack® - Online Photo and Video Hosting I attached an Arduino board to the receiver in the base station, but I think any 433 MHz receiver should be good to...
  11. J

    RF problem with interference between transmitter & recei

    This ancient thread never had a solution, but I have same problem: I'm using an **broken link removed** and I see very high noise on RX pin. Datasheet says "at least 100.000 pF ceramic capacaitor is needed"; I do not have it, so I used a 0,10 uF polyester cap: is it ok? What else could...
  12. J

    Which phone to use for serial connection to arduino/PIC?

    I know NOKIA phones (all of them?) do not use standard serial protocol but FBUS/MBUS. Is this correct? Which other phone should I buy to just use 2 wires connected to TX/RX pins of an RS232/TTL converter to communicate with a microcontroller? In other words, how can I know if a phone has...
  13. J

    old GSM phones for microcontroller projects?

    thanks to all! Added after 7 minutes: p.s. does anyone of this support GPRS?
  14. J

    old GSM phones for microcontroller projects?

    Who can suggest me which old GSM phones are suitable for easy connection to any microcontroller through standard serial connection? An old GSM phone can cost even less han 10$ on ebay! But nokia phones, for example, does not usually support AT commands, they use FBUS and MBUS protocol, so...

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