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  1. MP1

    Shift Registers

    There are delay chips and sample-hold chips on the market that can be used to achieve what you are trying to do. Also, the music industry is pretty well accomplished in delay techniques to get echo. Some of these devices will give you as much as 4 seconds of delay. You might want to research...
  2. MP1

    Led display Digital Voltmeter question

    There are many 7 segment displays which will work. Compare the specs in the data sheet. You will come across two types. Common anode and common cathode. This is the most important difference. Choose the correct one. Also look at the other voltmeter project in the projects section. It uses a dual...
  3. MP1

    i need help

    You have posted in the wrong area. Also, your subject line does not give anyone a hint that you are using a micro or building a stop watch. I doubt you will get much help. You should re-post in the micro area and use a subject line. Not a "help me" statement. MP
  4. MP1

    Volume

    Ante has given you good advice. I cannot imagine the tone is very good with this amp, either. A preamp will give you tone control and volume control. This circuit is not a good stand alone circuit. You might be able to add a pot to the front end, but this depends upon what you have connected to...
  5. MP1

    "Desperate Housewife" with Remote Control Project

    Don't forget to put some kind of release or safety switch in this thing. You do not want to injure a child (or adult, for that matter) if he or she gets their hands or head in the way of this panel when it is moving. Safety should be built into the plan. MP
  6. MP1

    Use a battery while charging it.

    Wkng, As you can see, this is not a general question. Do you have a schematic of the charging system on this device? If it is a commercial unit, perhaps it can be found on the internet. If you can post more information regarding this, I am sure you can get help on this. It is a simple task but...
  7. MP1

    Subject Line Descriptions

    It is so frustrating for me to go into one of the forum areas and filter through the topics to read when I see subject lines like: "Newbie needs help", or Help me!" or " I have a question" or "Need your assistance." Etc. Having a question or needing help is not a subject. "Laser Communication"...
  8. MP1

    PCB Design/Power supply for board

    You state that you are "Re-Designing" a board. What program was it originally designed in? Tutorials are specific to the program that is used for the PCB artwork. You will want to find a tutorial on that particular software. The other alternative is to completely lay out the board again in...
  9. MP1

    LM78XX & LM79XX questions

    Don't worry. Your motherboard will become obsolete way before the caps dry out with the way they are changing recently. MP
  10. MP1

    Chip Identity?

    felto and others: Here are some links from a site that primarily is geared toward arcade devices. They have some pretty good general info, though.... Component Marking Codes: http://www.ionpool.net/arcade/tech/component_markings/component_codes.html Lots of IC data includes pin outs and logic...
  11. MP1

    please help a newbie

    terrakota, It is hard to come up with any kind of accuracy with series parallel resistors that have a 5% or 10% tolerance. All of the resistors have the plus and minus inefficiency, so the error is multiplied. If you are making something that needs high accuracy, there are 1% tolerance...
  12. MP1

    Chip Identity?

    Dual Bipolar Comparator. Cross reference says it is close or the same as: TA75393 - NJM2903 LM293 LM393 LM293 LM393 LM293/A LM393/A LM293/A LM393/A LM393 LM293/A LM393/A MB47393 BA10393 LA6393 KIA393 - LM393 The most common equivalent is the LM393. Here is the pin out. MP
  13. MP1

    This place is great!!!

    Yes, we moderators feel very free to use the delete button in such cases. And we will delete any posts which are offensive or abusive to others. There is no reason for such posts on a forum. MP
  14. MP1

    Logic Gates IC Chips

    connect +5 VDC to Vcc and connect Ground to -Vcc. Use ground as a logic 0 and use +5 VDC as a logic 1. Test the following truth table for each gate of the NAND gate 74LS00: Inputs Output A B Y 0 0 1 0 1 1 1 0 1 1 1 0...
  15. MP1

    Logic Gates IC Chips

    You will need a voltage source. Use the voltage source to set the gate pins high and a ground to set the pins low. Use this procedure to test the logic table associated with the chip. MP
  16. MP1

    LED Chaser 3 x 36

    Looking up your previous posts is not going to show him how to make a 36 LED chaser. I am guessing cascading 4017s or making a twisted ring counter with JK flip flops is probably more of what he is looking for. MP
  17. MP1

    Relatively new, looking for some basic answers.

    Nice story. But when he put the cable in a trench and covered it up with dirt (earth), he was putting "Earth Ground" around the cable, which technically was the same as shielding your cable from interference. I can accept that this might not have been a real efficient shield, but to get enough...
  18. MP1

    Cutting PCB's

    I use a shear which is made for this purpose. I never liked the results from band saws, hack saws, etc. Depending upon the type of boards, some will melt and discolor if you fail to keep it cool while cutting with a high speed tool. Then there is the problem of fiberglass or phenolic dust in...
  19. MP1

    3-Axis Stepper Controller

    The inconsistency of your motor rotation might be due to not enough current. Setting the speed too high can also cause this. For a power supply, I usually use an old computer power supply. They are cheap, run cool, and have plenty of current at 12 volts. MP
  20. MP1

    Parts supplier

    I am pretty sure it is also available through DigiKey as a 20 pin Molex connector. MP
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