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Recent content by layoutdude

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    How to select drive strength model in H-lynx?

    Help with Hyper/lynx Greetings all! I have run into a small problem with H-lynx that I'm hoping somebody can help me understand. I am trying to simulate a DDR data route (just one for now). The part is a Micron MT46V16M16TG which supports two different drive output strengths (termed DQ_FULL...
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    Scanning Large Schematics

    scanning schematics PanaVue Image Assembler www.panavue.com Made for panoramic photos, but works great with scanned documents also...
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    Looking for 4/8-bit low power MCU for a battery application

    Why do you need a uC for a LED flashlight (torch)? Seems like a severe case of overkill to me...
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    What does mean Punch, Route and Hand Cut regarding to PCB ?

    Could also refer to board edge. Punch - The board is "punched" cookie cutter style (good analogy Flatulent) with a hardened steel tool. This is typically only done on single layer non-fiberglass composition PC boards. Its the cheapest if you are doing truckloads of boards. Route - Each board...
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    i need power schottky diode

    I think you are asking for too much. Consider the power in the part is going to be at least 0.75 watts (Vf * If), which is probably too much for a small package like SMA (SMB or SMC more likely, even better to use DPAK). Best of luck, but I think you are going to have a difficult time...
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    How to rotate a component in Orcad Layout Plus

    Or simply edit the components properties and set any angle you desire. Just keep in mind that the component with rotate about its origin, which is not necessarily the "center" of the component.
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    i need power schottky diode

    Also have a look ar International Rectifier www.irf.com I have used *many* diodes with VRR > 150 V and If > 10 Amps Your Vf will probably be lower because of your low forward current. For example p/n 10CTQ150 is right around 0.75 volts @ 1 amp @ 25 C (rated at 0.93 volts @ 10 amps)
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    pendrive - ist there a scheme?

    Windows NT 3.5/4 does not generally support USB devices. I believe there are a couple of devices, but each has a custom driver - not the generic support built into 98/2000/XP. Still, it would be interesting to see a schematic for one of those cool pendrives...
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    Buying an oscilloscope

    I must agree with koky. The best bang for the buck in scopes right now is the Tek 210 (60MHz Bandwidth) or 220 (100MHz Bandwidth). They even have a 4 channel 100MHz model, but its starting to get up there in price... They both have 1GSamp/sec, simple, useable (!) interface. I own a 210 and...
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    I'm searching for a pressure sensor with plain surface

    thomaz, Here is a datasheet and link for the transducer we were using. I don't have a current price, but I doubt its $300. When we were using the part it was made by Foxboro-ICT, but they have evidently been bought out by Invensys... w*w.pressure.invensys.com/tran5.html Best of luck...
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    I'm searching for a pressure sensor with plain surface

    Ouch! These parts were more like $30 to $50 USD, not $300. We were using over 20 per system, so $300 would have been a *major* problem. I'm still trying to hunt down the info, its from a project that was cancelled over a year ago so the files are rusty in the old brain pan. Happy hunting...
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    I'm searching for a pressure sensor with plain surface

    Well, a U.S. supplier that I have used in the past was Foxboro/ICT (I think they were bought out by someone...) They had (have?) a line of pressure transducers that were gel filled with a silicone pad for the contact area. I'll see if I can dig up a link or a datasheet and get it to you. Why...
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    [Question] Why PCMCIA and USB can hot-swapping, but ISA, PCI

    There are really two answers to your question, one hardware and one software. Hardware: PCMCIA and USB connectors are designed to make power connections on insertion before signals and break power after signals on removal. This provides a relatively safe "hot plug". The other bus connectors...
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    LDO regulators in very low noise rf designs

    You may be able to just increase the voltage and make the problem "go away" with the LDO (I didn't know that was an option for you). If you are using the LDO near the low drop-out (typically 1 - 2 volts) then it will increase output oscillation if you don't have adequate decoupling at both the...
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    LDO regulators in very low noise rf designs

    The noise you are seing is indeed most likely a feedback oscillation of the LDO's internal op-amp circuitry. Have you tried using tantalums on both input and output? Ceramics are great, but sometimes you need a little beef in your supply, especially if you have any significant transients in the...

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