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MP

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Posts posted by MP

  3. Make the cdw,mp3 to work off speakers

    in Electronics chit chat

    Posted

    This area is fine for this question. However, it might have gotten more exposure in the circuit requests area.
    It is really hard to answer this question without at least a block diagram of how your system is put together. There are so many different types out there that a generic answer would most probably be the wrong one. If you are distributing an NTSC signal over different inputs, you will need to make a video amplifier. If you are just needing to connect audio devices to speakers without going through the TV amplifier, then you will need to build an additional amplifier.

    MP

  4. SAD 1024

    in Datasheet/Parts requests

    Posted

    Not directly replacable by the MN1024, but you could use it instead if you lay out a different circuit board. It uses a different pin out and clock ckt. The SAD1024 was very prone to circuit noise whereas the MN1024 was not. In fact, the SAD chip was so bad with noise that you would almost always see a compander used in conjunction with it to get rid of the noise.
    BTW, the MN1024 is also obsolete. The digital delay lines took over, although this was after I quit fooling with these chips so I am not familiar with what is presently the popular delay line.

    Perhaps someone would like to continue this discussion in the "Circuit Ideas/Requests" area of this forum.

    MP

  5. SAD 1024

    in Datasheet/Parts requests

    Posted

    The SAD 1024 is a "Bucket Brigade" analog delay chip made by Reticon, discontinued several years ago. It is obsolete and you will not find one except in some rare surplus lots. If you happen to have one, you will find that they were used primarily for flangers, chorus, and echo music effects. I do not think I have an electronic copy of the data sheet but I am sure I have a hard copy somewhere. I will look around for the hard copy and see what it will take to turn it into an electronic copy if no one else posts one to this forum for you.

    What do you mean by "you need an application" for the chip?

    MP

  9. What resolution are you using?

    in Feedback/Comments

    Posted

    I access the site from a few different computers. One of these does use 600X800 and it is a little more work, but this does not bother me that much. I just move the pane so that I see the post and not the icons on the left.

    I have more problems with the pages loading slow. I have a pretty fast computer with a DSL connection, so I am not sure if I have a setting wrong on my computer or if everyone else experiences this also.

    MP

  14. OPAMP questions

    in Theory articles

    Posted

    I have never looked at this as a leniency. I have always looked at it as versatility. That is what makes the op-amp so popular. But there are rules. There are lots of publications regarding the use of op-amps and complete libraries of circuits built with them.

    MP

  17. motor controller protocols

    in Electronic Projects Design/Ideas

    Posted

    Steppers will not receive a serial protocol. They do not have any smart circuitry or logic in them. Just coils and the magnet basically. Whenever you see a serial communication to a stepper, the serial communication is sent to a micro or motor controller chip and the chip sends the data to the stepper in a parallel fashion. This is because the coils are energized in a sequence such as 1000, then 0100, then 0010, then 0001. (This also depends upon you using unipolar or bipolar). This sequence makes one step. To change the speed, you change the speed at which you send the bits to the stepper. To change the direction, you use the sequence above backwards. There are several motor controller chips that will do most of this for you and you only have to send a command for step and direction.
    The following is a link that might help. There is an in-depth tutorial on steppers here:
    http://www.cs.uiowa.edu/~jones/step/
    Hope this is helpful and I apologize if I have covered anything that you already knew. I really do not know what level of information you need, so I might have been stating the basics here.
    Will you be using a micro or one of the stepper controller chips such as the UCN5804B?

    MP

  20. Weird chip problem

    in Datasheet/Parts requests

    Posted

    SGS Thompson made several power amp chips like these which were a TDAxxxx, where the x is a number. You might try a cross there, and then try to cross a TDA number over to NTE as they seemed to have quite a few of their equivalent parts.
    I will also keep looking in some of the data I have.
    Here is a site with several of the TDA data sheets. You might find a similar one: http://users.otenet.gr/~athsam/database.htm

    MP

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