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  1. MP1

    Temp. Compensation for linear power supply

    Smartsarath, I have used this chip. There should not be much current across this resistor.  You ask about temperature problems. Are your components getting hot? This is where you want to start. There are also comments in the data sheet regarding output impedance. What is your load impedance...
  2. MP1

    Parking Lot Counter Question

    I think I would use logic gates to determine whether it was up count or down count. This being determined by which sensor comes on first. MP
  3. MP1

    Re: Alun's low voltage alarm

    ...and once again audioguru shows his lack of ability to use a data sheet... MP
  4. MP1

    Built a menu

    Yes, Visual Basic is very simple. You just make a form for each of your menu items, then add buttons which have the links to go there. For example, (it is hard to tell you how without a form in front of me, but I will try) make 2 blank forms. Name the first form FrmMain and the second, FrmTwo...
  5. MP1

    LED driver

    kkyip, Welcome to the forum. To answer your original question: YES, you can use discrete components instead of a driver chip. The purpose of a driver chip is so that you save space and money when building the circuit. MP
  6. MP1

    small current amplifiers

  7. MP1

    Transducer digital output to analogue

    Johndervill, You already have an analog signal. You just need to amplify it and scale it to read correctly. We build quite a few variations of baro sensors. Are you going to display it on a LED display, LCD, or just use a voltage out like 0-1 or 0-5? Will you be feeding the input to a micro...
  8. MP1

    amplifier audio/video

    Some car audio systems are built so bad that they will not power better speakers very well. In such a case an additional power amp is needed or you have some volume loss. Changing to a lower impedance speaker will always add volume and in many cases, better sound quality unless it is so much...
  9. MP1

    Low Voltage Alarm?

    MOERATOR'S NOTE: The + and - markings have been fixed on the schematic on this site. The Bill of Materials now lists the IC as a comparator, not an op-amp. If you have built this circuit and used the bill of materials and pinout of the schematic, you would not have noticed anything wrong. If...
  10. MP1

    Parking Lot Counter Question

    Use two sensors for the cars to go through and some gates to give you some direction. One of the sensors is going to be blocked before the other depending upon the direction of the car.  Then it is a matter of an up/down counter. MP
  11. MP1

    telephone forwarding

    fc, Unfortunately, digital phone systems have severe limitations. Once the T1 line goes into the building, the digital phone system has all the control. You cannot use standard modem protocols, AT commands or DTMF to control anything. All of the signals are multiplexed to simulate lots of...
  12. MP1

    Led display Digital Voltmeter question

    I think there is a smart kit for this project. Search for Smart Kits. MP
  13. MP1

    Low Voltage Alarm?

    There is nothing wrong with the circuit. If you look at the data sheet you will see why. The + and - markings on the schematic are mis labeled. Breadboarding the circuit shows that it will work. MP End of Topic. Alun's improved circuit has been moved to a new topic.
  14. MP1

    Lowpass filter for subwoofer

    Roby, Why don't you make your own? Texas Instruments has a free program that you can download named "FilterPro". You can design low pass and high pass filters with different slopes and up to 10 poles. The program is free and there are lots of features including graphs to show you the response...
  15. MP1

    laser idea

    There are various infrared lasers on the market and most will not produce what you are looking for here. CO2 or YAG lasers are used for cutting and they usually employ the use of gases to aid in the cutting of most materials. This is why laser cutting equipment is so expensive. You will not...
  16. MP1

    multiplier

    What kind of multiplier? Voltage? Frequency? Current? video? Then, what are the parameters? MP
  17. MP1

    COMPUTER SYSTEM

    I should warn against using color of the connector to determine the type of buss. I have seen and purchased these connectors in different colors in the past. There are other obvious differences in the buss connection. You cannot insert a card into the wrong buss. You should look at the...
  18. MP1

    OPTOCOUPLERS

    Kevin, they are also called "opto-isolators" because of this purpose. In fact TI lists them as "Optocoupler/Optoisolators". They are very good at isolation as well as coupling signals. MP
  19. MP1

    741 op amp

    Prateek, It used to be standard to add a compensation capacitor between pin 1 and 8 on op-amps. This goes back to the days when op-amps were in a round "tin can" package. Then after some time op-amp manufacturers realized that frequency compensation should be built in for standard applications...
  20. MP1

    I'M Lost!

    I have tried FireFox and in my opinion it SUCKS! The latest version of IE will give you all the protection you will need. Pages on all websites will open, instead of stumbling on those specific sites which were geared for a standard browser. If you think you are going to protect your computer...
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