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Recent content by udhay_cit

  1. udhay_cit

    TTL to fiber optic converter design

    Hi friends, I need to convert a TTL (UART) signal into fiber optic output using a 1x9 transceiver module (AFBR-5803). Please suggest a suitable level shifter IC to convert the single end TTL to differential output. Hope this module will accept PECL I/O. I need a single chip TTL-PECL and...
  2. udhay_cit

    Relay contact DC voltage rating

    Hi KlausST, Thanks for the replay. So the major deciding factor for voltage reating is the creepage distance between contacts and the conductor thickness is responsible for the current carrying capacity, right?
  3. udhay_cit

    Relay contact DC voltage rating

    Hi, I have a relay with 30V@5A DC rating. Assume its a resistive load. What will happen if I used it for 120VDC@1A? Will it damage or arc between contacts or degrade over the time? What will happen? where do I find the calculations or study material to understand this better?
  4. udhay_cit

    Position of tvs diodes

    1. What is mean by RJ45 side? Are you talking PoE power supply or data? Are you talking about before isolation transformer or after isolation transformer? TVS diode is advisable to use in PHY side. 2. TVS diodes will start to conduct above its breakdown voltage and it doesn't matter where its...
  5. udhay_cit

    MOSFET ORing circuit simulation (LTspice)

    Hi, My LTspice circuit simulation for MOSFET power supply ORing circuit is blocking the reverse conduction? Still I didn't tried this circuit practically. Now I need to use this circuit for one of my project and I did the simulation first. Unfortunately the MOSFETs are conducting in reverse...
  6. udhay_cit

    CR2477 Battery Parallel connection

    Hi, I need to power a Bluetooth module (Atmosic ATM2202) with CR2477 battery. The maximum power consumption will be 5mA peak for few mS time. Can I use two CR2477 batteries directly in parallel to increase the run time? Adding a schottky diode is not possible because of the voltage drop. I don't...
  7. udhay_cit

    How to remove layer pair in Altium 21

    I've created a mechanical layer pair for a project in Altium designer 21, but there is no option to remove the layer pair again. Only available option is to edit the layer pair where you can modify the layers, but now way to completely delete the layer pair. I did a google search but can't find...
  8. udhay_cit

    Altium- How to know component oriantation in BOM

    Thank you, but I don't get it. Can you elaborate little more. As you suggest I can add any parameter to display in the BOM, but what is the "keyword" to add the 'layer' in the parameter Value. For example: I can sort top or bottom side components (see the picture) from 'Rule', but how to add...
  9. udhay_cit

    Altium- How to know component oriantation in BOM

    Thank you, but is there any option or special stings or rule to automatically do this?
  10. udhay_cit

    Altium- How to know component oriantation in BOM

    Hi, We are planning for to purchase a SMD pick and place machine. Most of our PCB's are component are loaded in both top and bottom sides. We may need to solder any one side at a time and need to repeat the process once again for another side. I would like to know the possibility to include...
  11. udhay_cit

    Need current mirror circuit

    Thanks for all your suggestions. Sorry I have not given full details earlier. I have an instrument which is giving a 4-20mA current sink, where I have to connect to another instrument which will accept current source. I can't modify either of the device internal circuitry. So I have to insert a...
  12. udhay_cit

    Need current mirror circuit

    Hi, Is there any simple circuit (current mirror) to convert current sink to current source. Thanks in advance. Udhay
  13. udhay_cit

    Need suggestion to select an (1GHz) Oscilloscope (Tek 5 series Vs R&S RTO2000)

    Hi, For my company I need to select an oscilloscope with 1GHz BW, 4Ch analog. We have received an excellent offer from both Tektronix and R&S. Both are good and both has its own advantages and disadvantage which leads me confusion. Please give us your valuable opinions to select any one from...
  14. udhay_cit

    Atmel Qtouch PCB suggestion

    I need to use a touch key pad (4 key) for my IP67 rated plastic enclosure. I've selected the AT42QT2120 touch sensor IC and designed PCB to operate standalone mode. Unfortunately the IC giving random output and not functioning properly. If any one has experience with Atmel Qtouch or any touch...
  15. udhay_cit

    Designing a simple Isolated DC/DC converter

    Finally, its working:thumbsup: Only 2 transistor and single resistor. As I can understand from the operation, the switching frequency is depends on the toroidal core permeability and the number of turns. The switching frequency varies based on how fast the core is saturating. I managed to get...

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