Jump to content
Electronics-Lab.com Community

mixos

Administrators
 View Profile  See their activity

  • Posts

    581

  • Joined

  • Last visited

 Content Type 

Posts posted by mixos

  2. BT9151 and 1200p60

    in Datasheet/Parts requests

    Posted

    You are pretty lucky HA :D . Here is what i found:

    BT9151 is equivelant to UM9151 and it is a Pulse Dialer with direct Phone line operation. 4 * 3 matrix keyboard interface. Supply voltage range of 2 to 5.5 V. 22 digit redial memory. Selectable make/break ratio. High speed test capacity.





    and this is a usage schematic:



    I attach you also the UM9151 Datasheet

    UM9151-3.pdf

  10. Site Downloaders

    in Announcements

    Posted

    After further investigation this can also be caused from OFFLINE browsers that download all the site.

    Important Notice: Don't use site rippers, copiers, downloaders or offline browsers. This kind of software causes overload and the site goes down!. Please respect this, otherwise your IP will be banned.

  16. Piezoelectric Transducers

    in Electronic Projects Design/Ideas

    Posted

    The conversion of electrical pulses to mechanical vibrations and the conversion of returned mechanical vibrations back into electrical energy is the basis for ultrasonic testing. The active element is the heart of the transducer as it converts the electrical energy to acoustic energy, and vice versa. The active element is basically a piece polarized material (i.e. some parts of the molecule are positively charged, while other parts of the molecule are negatively charged) with electrodes attached to two of its opposite faces.



    When an electric field is applied across the material, the polarized molecules will align themselves with the electric field, resulting in induced dipoles within the molecular or crystal structure of the material. This alignment of molecules will cause the material to change dimensions. This phenomenon is known as electrostriction. In addition, a permanently-polarized material such as quartz (SiO2) or barium titanate (BaTiO3) will produce an electric field when the material changes dimensions as a result of an imposed mechanical force. This phenomenon is known as the piezoelectric effect.

    Piezoelectric Effect (PPT, 89kb)

    Source: http://www.ndt-ed.org

    more here: http://www.ndt-ed.org/EducationResources/CommunityCollege/Ultrasonics/EquipmentTrans/piezotransducers.htm

    I think that Piezoelectric Transducers are used to our mobile phones to make them ring, or i am wrong ?!

  20. Simple PC thermometer

    in Projects Q/A

    Posted

    When i tryed to test the software alone (without hardware) the same error apears in Win XP Pro. This is clear that has to do with the software constuction. I suggest to e-mail the author here: natan[nospam]email.si (don't forget to replace [nospam] with @)

    Also try to istall this on your system: http://www.electronics-lab.com/projects/pc/020/port95nt.exe

    Or try this PC thermometer: http://www.electronics-lab.com/projects/pc/016/index.html

    I have tested it and it works nice, it works with the joypad port.

    Don't forget to report back any corrections.

  21. Free sample chips!

    in Electronics chit chat

    Posted

    Can anyone suggest any interesting chips that availaible as samples? I am starting with some:

    MAXIM
    MAX038 - High-Frequency Waveform Generator
    DS1869 - 3V Dallastat Electronic Digital Rheostat
    ICL7107 - 3 1/2 Digit A/D Converter LED
    DS1920 - Temperature iButton
    DS1620 - Thermometer Sensor

    TEXAS INSTRUMENTS
    TPA1517 - 6-W Stereo Audio Power Amplifier
    TMP100 - Digital Temperature Sensor with I2C Serial Interface
    UC3770 - High Performance Stepper Motor Drive Circuit

    MICROCHIP
    MCP42100 - 100 K Digital Potensiometer
    PIC16C765 - 24Mhz, 256 RAM USB, USART, 8ADC, PWM 2, 3+WDT

    any others?

  23. Led display Digital Voltmeter question

    in Projects Q/A

    Posted

    Great Work Billy. Thanks for doing that :D .

    Sometime ago an internet friend told me that the kit companies are making some small faults (not by chance) on schematics to prevend them from copying :o ! If you relly on the PCB, everything will work nice, becuase it's a copy of the original (already worked) board. So you can use it to debug the schematic.

    Please do the debuging and make the changes to the schematic... i will be very happy to see it here!

  24. Convert 0-30V 3A PSU to 5A or more

    in Electronic Projects Design/Ideas

    Posted

    The transformer i bought was rated at 3A, but seems to be able to give more that this :D ! Also i didn't touch anything on the current limiter circuitry, I just set the current limit to full, that the strange!

    Staigen: I haven't done the testing yet. Sorry for that, you will have to wait some days.. ::) By the way, I am happy you are an expert in PSUs that's give me some hopes to make this power supply even better :D, we hope to continue sharing your knowlebge with us! But can you be a little more detailed...

    Why the case must has a 25 C, and not let's say 120 C (200C is the max temp that can affort this part) with a radiator of course.

    "At 3 Amp output the rectifier is delivering about 100 Watts" Why so much watts?

    Please help us understanding how you think in every result you post. So less experienced peoples will learn something!

    Hope i am not getting bored.

  25. Transistor tester

    in Projects Q/A

    Posted

    Yesterday I received a report from a user, read it:

    I have an update for you regarding the transistor tester as I was having a few problems in getting it to work well it works now as a few modifications have been added such as connecting pin 8 of the 4027 to ground and then linking pins 3 and 9 of the 4027 together it then works.

    once again many thanks mike it is a good site.

    keep up the good work from kev Tellyaddict42[no-spam]aol.com .

    Anyone that don't succed with this transistor tester can try this solution and post comments here so i will make any suggested corrections on schematic.

    Thanks

×
×
  • Create New...