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  1. OLIVE2222

    30 ft wireless transmission

    Hi sarah11178, Welcome to this forum ! Already try wireless vga in google ? Olivier
  2. OLIVE2222

    Sinewave (~1.5 Mhz range) switching.

    You can go for a Maxim DG301 in place of CD4066 just remap the pin's accordingly. http://datasheets.maxim-ic.com/en/ds/DG300A-DG303A.pdf Free samples are available here: https://shop.maxim-ic.com/storefront/searchsample.do?event=Sample&menuitem=Sample&Partnumber=DG301ACJ%2B This Mux...
  3. OLIVE2222

    Sinewave (~1.5 Mhz range) switching.

    Hi Mono, You can go for a SPDT(2:1) Mux of the DG serie as stated by Resqueline and supply it symetrically. The unused mux connection must be grounded. Then the tricky part is to implement a zero crossing detection circuit to ensure you don' t "cut" a sine cycle when switching. Olivier
  4. OLIVE2222

    Sinewave (~1.5 Mhz range) switching.

    Hi Mono, Is your sinus genrator an analog one or do you sine re-shape a digital signal? Olivier
  5. OLIVE2222

    stop feedback noise

    Hi, You can maybe implement a voice activated trig circuit in the mike path. This should act as a switch. Olivier
  6. OLIVE2222

    Microclimate ministat300 repair help

    Hi Brett, Here an app. notes on transformer less power supply. http://ww1.microchip.com/downloads/en/appnotes/00954A.pdf indeed the big cap is part of the power supply. Olivier
  7. OLIVE2222

    Unknown metallic boxes

    Hi, With such opening at the top and 3 contacts I will say electret microphone. Olivier
  8. OLIVE2222

    Reset or Clear a ELMOS 10030A IC. Or datasheet!

    Hi, This is a ID chip for BMW keys. Do you believe that BMW spread the datasheet ? Olivier
  9. OLIVE2222

    Microclimate ministat300 repair help

    Hi Brett, The top resistor in the middle of the board, part of the main supply, as suffer a bit as becoming brown. ==>EDIT: OK you find it. The electrolytic caps (3 X black cylinder) are prone to fail, having them working for 12yeras is a good performance! That's a first thought, Olivier
  10. OLIVE2222

    MCU's, EEPROM's and Oscilloscope ?

    Hi MrWho, Having a scope is always a good thing to really see how your signals are looking. Some modern scopes are better as they include dedicated I2C and SPI bus analyzing (including data decoding). However having a combination of an old scope and a tool like the bus pirate should be handy...
  11. OLIVE2222

    Antenna help

    Hi, If you try the antenna solution here what's sma and reverse sma looks like. http://wificablepro.com/wp-content/uploads/2010/09/SMA_Connectors-Understanding_WiFi_Polarity_CR21.jpg and a common type of SMA attenuator (here 3dB) http://www.minicircuits.com/pdfs/VAT-3+.pdf or...
  12. OLIVE2222

    Antenna help

    Hi jackorocko, An attenuator can probably do the job (being reversed sma you probably need an adapter too) I let you the floor Davenn :) Olivier
  13. OLIVE2222

    SDRAM problem

    Jane, ==> made a repair flowchart based on your experience and the components datasheets. Also clearly define tespoints on the PCB That's the only way i see. Based on components datasheet you can made a partial reverse engineering and drawing a kind of schematic/building bloc mix with all...
  14. OLIVE2222

    SDRAM problem

    jane, Ok they are dreambox priced at around 200$ and using a very dedicated processor. Bought a development chain and acquiring skills to develop a test program can probably not be done profitably for such components. I guess myself how you can desold and resold such processor without big...
  15. OLIVE2222

    SDRAM problem

    Jane, -What's the used processor? -It's the BIOS socketed? -It's the CPU socketed? -Is the board have an extension bus? -What's making this board so specific? -is the board manufacturer still is business? -Can you please post board pictures? -Do you fell that, with a modified BIOS...
  16. OLIVE2222

    SDRAM problem

    Jane, Maybe better to do something like first cheeking the CPU sanity by locking at key signals like R/W, clock and few data bits. If it 's look OK you can check all signals before and after buffer (including control and direction pins ), gates .. then you can look at key sdram signals /CS, /WE...
  17. OLIVE2222

    SDRAM problem

    Jane, sure in practice you must adapt an existing tester via the CPU socket (if any) or an extension bus (if any), find maybe a way to pick-up the /CS signal... or indeed made/modify a bios or at least doing a test program to test the 4 pieces of SDRAM modules. Do you have the board schematic...
  18. OLIVE2222

    SDRAM problem

    Jane, To test the RAM you must : -Select it -address it -write it -read it back Exhaustive test involve write/read on all location's so. Olivier
  19. OLIVE2222

    SDRAM problem

    Hi, If the bios and the cpu are socketed maybe you can remove them and find a way to test the SDRAM's with the suggested tester. Olivier
  20. OLIVE2222

    Help about transmitter and receiver

    Asad, The means are almost the same to drive a relay from a pulse from one or 2 channels. You already find out that you can have the pulse width value being converter to a voltage. So an analog solution can be to integrate the pulse and amplify it to around 5 volts. A digital solution...
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