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  1. OLIVE2222

    Boost converter

    You right jackoroko the UC3843 with the totem pole output stage is well adapted to drive MOSFET compared to the MC34063 open collector output stage. An "optimized" driver must be able to fastly drive the gate despite it's represent a capacitive load. Olivier
  2. OLIVE2222

    Boost converter

    Cheap FET driver are available from microchip http://search.digikey.com/us/en/products/TC1427CPA/TC1427CPA-ND/267372 to be used in combination with the MC34063. Here under a practical design,with technical highlights, based on a UC3843, same generation as the MC34063, i.e. not optimized for...
  3. OLIVE2222

    Boost converter

    Hi jackorocko, for almost the same price the MC34063 can be better at the task. He offer a regulation and a current limiting. Just need an external FET, as with the 555 anyway. Olivier
  4. OLIVE2222

    capacitors as batteries

    Hi, Indeed high value caps have many disadvantages but they are not submitted to (country dependent) recycling procedures or (air) transportation restrictions. A good compromise, if practical, can to use a cap and to make time adjustment with a Time Server or a GPS. Olivier
  5. OLIVE2222

    finding the right part?

    Hi, my bet is that it can be an optocoupler. According to the PCB layout the component is located across an isolation area and there is an agency approvals marking on the package. Olivier
  6. OLIVE2222

    PCB footprint question?

    it' s OK, you can maybe just move the decoupling cap close to the PIC pin 14. Olivier
  7. OLIVE2222

    PCB footprint question?

    OK Jackorocko, looks cleaner now! You can finalize the grounds filings as it: Reduce the isolation and/or via diameter a bit to allow filling between PIC and drivers pads. Avoid paralleling track to closely like RB7, +5V and RB6 tracks to allow the ground finding is way. You can move...
  8. OLIVE2222

    PCB footprint question?

    Hi, However it's probably electrically OK it smell auto-routing, you can improve it by routing the board manually as the density is low. By placing the main tracks part on the bottom layer you can free up the top for ground purpose. It's also easier to work with when tracks are...
  9. OLIVE2222

    PCB footprint question?

    Hi jackorocko, A rule of thumb is to have the pad diameter around 2 time the hole diameter, the current is not really limited here thanks to the solder join. for the tracks dimenssioning you can have a look here: http://www.desmith.net/NMdS/Electronics/TraceWidth.html National provide...
  10. OLIVE2222

    need help about Ultrasonic Range Finder

    Hi jameschia, Please post schematics (and maybe pictures) and tell what is working and what doesn't. Olivier
  11. OLIVE2222

    Gripper mechanism

    Hi Piyush Goel, Welcome to this forum. What's are your skills, do you want to build it from scratch, on kit form or a mix? Do you want it on wheel on legs.. What's about the controller, something in mind? for the grip part: http://www.robotshop.com/lynxmotion-little-grip-kit.html...
  12. OLIVE2222

    I think I need some prototype boards and a...

    Hi, You can find isa proto board at futurlec: http://www.futurlec.com/ProtoBoards.shtml#ISABUSBRD.shtml Not cheap but yes it's epoxy with golden plated fingers! A picture of the module inside will be helpful to estimate if it can be duplicated. Olivier
  13. OLIVE2222

    Need help with a schematic.

    Hi, Sometime I give a hand to special effects guys and they use models remote controls (Futaba,Hitec..) a lot. You can find receiver compatibles (inverting) relay modules to control your fan with the sticks. It's more flexible as you can decide yourself according how the inflating is looking...
  14. OLIVE2222

    Finding the Correct RFID reader?

    Hi Luke, Welcome to this forum! They are many frequencies (and protocols) used for RFID purpose. You can grab many information's one the web, here about the frequencies: http://www.rfid-handbook.de/rfid/frequencies.html And the protocols...
  15. OLIVE2222

    mega8, 1wire eeprom (DS2431) and bascom

    Hi Nik, If not already done I suggest you the Bascom dedicated forum: http://www.mcselec.com/index2.php?option=com_forum&Itemid=59 Olivier
  16. OLIVE2222

    need help to make an auto audio switch/interrupt

    Hi Todd, You can use a Voice-Activated Switch / VOX (just google that). You need to pick-up the existing microphone signal and to connect a relay in the heaphone path. Olivier
  17. OLIVE2222

    all in one cable tester

    If you go for the EDN scheme you can use a simple step-up to have (max) 30V as this one...
  18. OLIVE2222

    30 ft wireless transmission

    I don't have practical experience with VGA wireless products. At first I don't feel you will have losses. You can maybe shortlisted few products then look on the web for related information's on (computers) forums. Olivier
  19. OLIVE2222

    all in one cable tester

    Hi, here enclosed my favorite KISS cable tester scheme published by EDN. Olivier
  20. OLIVE2222

    Please Help (Steth o Tracer)

    Lovely vintage item ! I love the smell of germanium in the morning
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