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Recent content by leonardo0

  1. L

    Altium productivity question...

    Hi to group I'm using Altium designer and i have one simple questions which i can't seem to find an answer. I have some old projects for which i want to change fonts , colors.I also want to change document color , system fonts .Is there an easy way except to work with inspector an through...
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    Altium Designer 3d modeingl frustrating question .

    Altium Designer 3d modeingl frustrating questions . Hi to group I have some questions that confuse me in AD14 . Is the best way to use Altium with a database linked to sch,pcb,pcb3d libs or an integrated library containing everything ?.I have experimented with database and find it very...
  3. L

    Can i use BAV99s as rectifier bridge ?

    thanks It is obsucre to me this characterization as swithcing or rectifier since if Vr,Vf,I is correct then why not use them ?
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    Can i use BAV99s as rectifier bridge ?

    Hi I have a need for smallest rectifier for 24 V 100 ma . I was thinking to use bav99s .I don't mind for 1.2 V vf . Is there a problem since it is not characterized as rectifier but rather as switching diode .
  5. L

    smple Analog Isolation circuit needed

    Hi betwixt thanks your solution is fine .It needs only needs 8xrelay cost + board space that i don't have . Possibly isolated solid state relays.Still expensive though My application requires 5 displays separated together by 5 meters . Along with signal lines are vcc and gnd lines that...
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    smple Analog Isolation circuit needed

    Hi to forum I have 5 boards equipped with 8 channel adc and display .The board inputs i need to connect in parallel with each other so signals can show wherever a board is located .In front of each input there are shunt resistors 10K working as selectable pull up or pull down . The problem...
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    Strange Altium behaviour and advise needed

    Hi to Group I'm evaluating altium 9 . I'm testing the autorouter and i found the following problem .After autorouter finishes i want to make some cleaning passes so i order the autorouter to run again the "clean or hug or spread " .I observe some vias are diassapearing leaving only top and...
  8. L

    nxp lpc2000 code read protection issue

    Hi to forum I plan to use an LPC2478 for an ambedded project .Has somebody a clear view about code read protection? .I read that it has been breached. Is it so ?. Or is it a previous fault of the ISP ?. Can somebody enlighten me since it will be a serious investement i plan to make . Can...
  9. L

    Information about audio broadcasting rf-link needed

    Hi I'm new to broadcasting. I would like to setup a radio link for an fm radio station . The operating frequency of the link must be in the 1.7 GHZ range. The channel bandwidth is 200 KHZ .As i understand a multiplex signal 0..57 KHZ coming from the fm-station must be digitized ,encoded and fed...
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    Information about audio broadcasting rf-link

    Hi I'm new to broadcasting. I would like to setup a radio link from an fm radio station . The operating frequency of the link must be in the 1.7 GHZ range. The channel bandwidth is 200 KHZ .As i understand a multiplex signal 0..57 KHZ coming from the fm-station must be digitized ,encoded and...
  11. L

    help on i2c eeprom wear-out

    Hi to group I have a serious problem with an 24C64 W6 from ST. After a few months of field operation in a device i can't erase some memory cells . I read several cells of the eeprom every 4 seconds. The device is powered continuously. Is it possible that this creates problem to the chip?.I...
  12. L

    ac relay drive problem .Help needed

    Thank's for the reply Mcu Man It has also driven me mad . The thing is with no AC load everything works ok. So i suspect that the problem is not in the winding of the drive relays rather than the winding of the load relays. So i'm oriented towards the zero crossings solution .
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    ac relay drive problem .Help needed

    Thanks guys for your answers . Now regarding mov the problem is that in case of mov failure they usually short so this would turn on permanently the exit which would cause a series of other problems . One time i've seen that so i can't go for that . The other solution with the diode shunt to...
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    ac relay drive problem .Help needed

    problem of ac relay Hi. I have a problem with the drive of a 220 V ac relay . I have an 8051 mcu with which i drive (with a uln2003 interface ) a 12 vdc relay. This in turn switches a larger 220V ac /6W relay . I have a snubber in shunt with my 12v relay board consisting of a .033 uF X2 cap. in...
  15. L

    @ltium Libraries help needed

    Thank's house_cat . It is a bit fuzzy but it works. In the end i figured out why global change doesn't work as in the schematic. If you are interested i can write it. It would be good though to have a single line excel type spreadsheet for each component where each "parameter field" represents...

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