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Recent content by kelvchan

  1. K

    RE: LOOKING TO SELL LAB EQUIPMENT

    The prices are as below 1) HAMEG INSTRUMENTS (2400 Euros) - PROGRAMMABLE POWER SUPPLY HM7044 2) TEKTRONIX TDS3014B & TCP202 CURRENT PROBE (2600 Euros) - 4 CHANNEL COLOR DIGITAL OSCILLOSCOPE 100MHZ 1.25GB/S DIGITAL PHOSPHUR OSCILLOSCOPE - COMES WITH ORGINAL PROBES 3) TOPWARD 8150 (400 Euros) -...
  2. K

    RE: LOOKING TO SELL LAB EQUIPMENT

    RE: LOOKING TO SELL LAB EQUIPMENT I HAVE THE FOLLOWING EQUIPMENT FOR SALE, IN EXCELLENT CONDITION. 1) HAMEG INSTRUMENTS - PROGRAMMABLE POWER SUPPLY HM7044 2) TEKTRONIX TDS3014B & TCP202 CURRENT PROBE - 4 CHANNEL COLOR DIGITAL OSCILLOSCOPE 100MHZ 1.25GB/S DIGITAL PHOSPHUR OSCILLOSCOPE -...
  3. K

    Re: Exporting from Altium to Pro-E

    Re: Exporting from Altium to Pro-E Hi I have a pcb layout in Altium Designer and wish to export it out with its components on to an acceptable file format accepted by Pro-E so that I can check for mechanical fit in my project. Please advise on the procedure and file formats to convert from...
  4. K

    What kind of TVS diodes will withstand a 100C DC surge for 50ms?

    Hi, I am designing a system to be compliant to MIL-STD 1275E. It has to withstand a 100VDC surge for 50ms, what kind of TVS diodes can place upstream to handle this surge? What levels of current am I looking to suppress? Any idea?
  5. K

    Re: Converting inductance to microstripline

    Re: Converting inductance to microstripline Hi, I wish to convert inductance value to its equivalent length of microstrip line with a given substrate height and dielectric permittivity, any closed form expression? Values are: Inductance Value: 0.87nH Substrate height: 0.35mm Thanks
  6. K

    Re: Relay Design for DC Source

    Re: Relay Design for DC Source I have a 28V 50A source. I wish to implement a relay to handle this source and have a switch for switching ON/OFF this relay. Any advice or sample circuit design for this implementation? I prefer a SMD mount, low profile, small footprint relay.
  7. K

    Re: Impedance matching of quadband antenna

    Re: Impedance matching of quadband antenna But what if there is a need to do dual band matching then, not necessarily a handset, but an antenna with two band with a PI network? How would it be done then? Do you match to the upper frequency first or the lower one first or do you find an average...
  8. K

    Re: Impedance matching of quadband antenna

    Re: Impedance matching of quadband antenna Hi I am looking to match a quadband antenna, basically, two resonances for a handset. I only have a pi configuration matching network to play. How should I match to both resonances since I have only one matching network to use? Please advise. Many thanks
  9. K

    sliding mode controlled Boost Converter

    Re: Boost Converter Design Hi I took apart a dog collar. There was this decently big cube like transformer, measuring 1.2cm by 1.2cm by 1.2cm. The input pair of leads are shorted while the output leads are open circuit with a resistance of 1.5Kohm. I would think this is a current transformer...
  10. K

    sliding mode controlled Boost Converter

    boost converter design Hi, I am working to design a boost converter for dog barking control usage, the electrical discharge circuitry. Does anyone have a circuit for reference as I am looking to boost from coin cell battery of 6V to kV region. Any reference will be great!
  11. K

    Re: electronic dog collar

    electronic dog collars I am working on an electronic dog collar. I am looking for the electric discharge device and am wondering where can I get it, i.e. who are the suppliers? Many thanks.
  12. K

    Re: Extracting decals from Eagle library to ASCII file

    Re: Extracting decals from Eagle library to ASCII file Hi, I am interested to find out if I can export pcb decals or pcb decals in eagle layout editor to ASCII format or netlist and be imported into other CAD software such as PADS Layout? This would facilitate me as I am using PADS layout but...
  13. K

    Casira Development Kit

    casira development kit Hi, I am trying to use the bluelab development software on two casira development kits. With the casira plugged into my pc via parallel port to SPI and RS232, I was unable to access the PSTOOLS on bluesuite, an error message saying that HCI communication failed and to...
  14. K

    Re: Casira Development Kit

    csr bluesuite download Hi, I am trying to use the bluelab development software on two casira development kits. With the casira plugged into my pc via parallel port to SPI and RS232, I was unable to access the PSTOOLS on bluesuite, an error message saying that HCI communication failed and to...
  15. K

    Which Bluetooth chips can communicate simultaneously with two devices?

    I wish to enquire if bluetooth chips like the CSR bluecore 4, 5 and 6 are able to communicate with a bluetooth headset and data transfer with the PC simultaneously? This means I have a third device having the bluetooth chip communicating with both PC and headset at the same time.
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