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  1. MP1

    Making PCBs with magazine's paper

    Billy, There are many ways to make PCBs and these are as different as using any one of the many circuit layout programs. Some of it has to do with taste, but a lot of it has to do with features. The same is with the many methods of fabricating PCBs. In my workshop, the transfer method will not...
  2. MP1

    Datasheet for CXA1110AS/B

    The CXA1110AS/B is an obsolete chip. Last buy date, according to Sony, was 12/97. The best two choices might be: (1) Contact Sony on their website and ask for an alternate (2) Search the obsolete parts vendors to see if they have some available. The following link has a list of obsolete parts...
  3. MP1

    STi5518 Datasheet

    Hello HA, I have found the following link at ST Electronics. http://us.st.com/stonline/press/news/year2000/p845p.htm It is the press release for the STi5518. This is a pretty interesting chip with a lot of features. If you do not find the data you need from this link, they have a contact link...
  4. MP1

    3-Axis Stepper Controller

    This is a bipolar stepper. This actually has wires to each of the coil ends in your motor. If you have a diagram of your stepper, you will see 4 coils in sets of two. A 6 wire stepper simply has these connected together inside the motor. You will connect the 2 wires at the center of the 2 coil...
  5. MP1

    how real is it to power an inverter of 1.5kva with a solar panel

    p.s. - Nice sites, Mixos. :D MP
  6. MP1

    how real is it to power an inverter of 1.5kva with a solar panel

    How real it is to power this much from a solar panel is dependent solely upon (1) how many panels you have (Panels are usually rated by Watt) (2) how much backup power you have (batteries) (3) how much sun is in the region you live in. (closer to the equator is better) #3 is the biggest...
  7. MP1

    Sine wave power inverter

    Kasamiko, Some information on Inverters: There are 3 major types of inverters - sine wave (or "true" sine wave), modified sine wave (actually a modified square wave), and square wave. Sine Wave A sine wave is what you get from your local utility company and (usually) from a generator. This is...
  8. MP1

    Tranformer questions

    Sometimes it is easier to get the specs on the receiver. If you can find the schematic of the receiver, it will probably have the transformer information on it. You might try a search with the model name and the word schematic to see if someone has it on the web. MP
  9. MP1

    Need Datasheet for TA8680N

    Kasamiko, I cannot tell you what this part does, but I can tell you that you can get this part at this link--> http://www.slelectronics.net/sem-ta.htm for $5.95. Perhaps the owner of that site will have some information for you. MP
  10. MP1

    CAD Program opinions

    Thanks Staigen. Since I like to make my own PCBs for small jobs and shop around for larger ones, ExpressPCB would be inhibitive for me. I did try it at one point but did not care for the lack of gerber output. Their prices for boards are not bad, I just worry that at some date in the future I...
  11. MP1

    Please help me OTA required

    The CA3080A is an excellent OTA for sound applications. I think the spec is up to 2 MHZ. Is this what you are looking for? MP
  12. MP1

    3-Axis Stepper Controller

    Ahh! The last post reminded me. Here is some information regarding the CNC programming for those who want to write their own programs or for those who are just interested. Not sure where I got this file, but it has lots of information regarding the CNC commands. MP CNC_Programming.pdf
  13. MP1

    CAD Program opinions

    I find that I use a number of different programs for creating schematics and board layout. The different programs all have their features and also some dislikes. If I want a small simple board, for example, it is not always easy or quick to do in OrCad or Eagle. In such a case, I just use a...
  14. MP1

    Temporary power shut off

    Bonanz, What you are looking for is a RS Latch. You might be able to use a JK flip flop in place of this. Either of these should be readily available as they are both very common devices. MP
  15. MP1

    burried cable dector

    There are two different methods used for this. One is a simple metal detector. This is what is used for finding buried cables before digging. You do not have to have a power source in the cable to find it. The other type is an inductive pick up which pulses an amplified votage, then is sent to...
  16. MP1

    LM317KCS From Texas Instruments

    There are a number of ways to do this. What you are looking for is automatic switching. This can be accomplished with transistors and comparators. If you are familiar with comparators, you can use them to switch the base of a transistor that is rated for what you are going to run through them...
  17. MP1

    Wireless remote power supply

    Sounds like an interesting project. What are you making? there are a number of alternatives to battery. One option is what is known as super caps, which is what is used in many computer systems. Once they are charged they will hold a charge for a very long time and thus are used in the place of...
  18. MP1

    electric fencing on indicator

    I am assuming that there is a low power side to this circuit. The electric fence amplifier box is stepping a smaller voltage up to this level. Why not use a voltage divider on the low voltage side to bring it down to 2 V or thereabouts and run that through a resistor to the LED? It will be much...
  19. MP1

    Open Circuit Test

    Looks like this has been here a while, so I will take a stab at it: Depends upon the circuit it is measuring. If it is not too fragile of a circuit, I guess you could just make a simple probe from an LED, a 1.5 battery, and two probes. If the probes are connected across an open circuit, the LED...
  20. MP1

    stepper motor

    Try this site: http://home.planet.nl/~meurs274/ Some stepper projects with Atmel AVR. I know you have the 89C51, but there is enough similarity that this should be what you need. Basically, your port pins send the pulses and the ULN2803A drives the signal. Very simple layout. Even has a board...
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