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Recent content by letrongdtk4

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    Nurse call system use RF

    Thanks of all, if i use 433MHz or 915MHz band. can my system affect other equipment in hospital?
  2. L

    Nurse call system use RF

    Hi all, i need designed a nurse call system. Ex: 5 room, 21 bed - Nurse station : 01 - Nurse present : 01 - Corridor light : 05 - Bed head: 21 (1) I wanted use RF Technologies. But i don't know choose band: 2.4G, 900MHz, 433MHz, ..... (2) I have not solution for the battery Thanks,
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    Help me convert 0-10V to 0-2V

    Hi all, 1, Because i haven't precision resistor. I use a variable resistor to overcome this. 2, LTC1598LIG provide a built-in sample and hold function. How to adaptation of impedance ? I think just like the picture 1 in last attachment. 3, I have power supply 3V3. Can use it for LM358 ? (...
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    Help me convert 0-10V to 0-2V

    Re: Convert 0-10V to 0-2V Hi, I do not know much about this I see they have added a current buffer can you explain for me when need it ? Thanks,
  5. L

    Help me convert 0-10V to 0-2V

    Hi all, I need measure 16 channel 0-10V or 4-20mA. I use LTC1598 with VCC = 3V3 and Vref = 2V5 Now, i want convert be 0-2V. I have two ways to do this. You can see in the attached file But, i don't know a better way What are good OPAMP ? Thanks,
  6. L

    RS485 multiple transmitter/ multiple receiver

    Hi all, I have system as picture in attach file. in there, all the points are able to receive and transmit R120 ohm in N9 and Display I know such as not recommended. But I have connected. Is there any way to solve this error ? thanks,
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    Step motor circuit is hot

    Hi all, I repairing ICE 3300 - Thermo. Stepmotor circuit design same attach file. But i don't understand motor is hot. Hope, i receive guide. Thanks
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    PCB Design for the Spartan-3E FG320 BGA

    Hi, Sorry, i forgot to send file. Can you tell me more detail Thanks,
  9. L

    PCB Design for the Spartan-3E FG320 BGA

    Hi, Thank for your help. 1, I have reviewed. I use separate module power supply. I have edited the attachments. 2, i will read application you send. I i have problem. I will tell you. Thanks,
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    PCB Design for the Spartan-3E FG320 BGA

    Hi all, I have a PCB design for the Spartan-3E FG320 BGA in attach file. 1, Can you see schematic and send to me your remark ? 2, I will design PCB 4 layer. - Stackup : + TOP (Signal1) ---------------------- 9 mil...
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