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  1. MP1

    LC Metre

    Some manufacturers made 16 X 1 displays which were 16 characters on one line, but the on-board electronics were actually 8 X 2. These were referred to as 16X1a. MP
  2. MP1

    RJ45 network card to IR

    Serge, I am assuming that you have built this circuit and it is working good, yes? MP
  3. MP1

    A stand alone sine wave generator using Atmel chip

    As AVRFreakMan has said...check out the link. MP
  4. MP1

    0-30 Vdc Stabilized Power Supply

    juanpmoron, C7 is just a bypass cap on the output. Most likely, you have either connected it wrong or you are using a capacitor with too low of a voltage rating. Was it a used capacitor? What do you have connected to the output that audioguru thinks might cause your problem? In an earlier post...
  5. MP1

    Posts

    Yes, a salute to full members. I would also like to send a Welcome to all new members! I see the site at the time of this post now has 1959 members. MP
  6. MP1

    A stand alone sine wave generator using Atmel chip

    Groovy, are you making a sine wave inverter using the "magic sine waves" principal? If so, there was a discussion at Electronics Forums / Circuit/General Requests / True Sine Wave Inverter on this forum. You will find links posted there as well. MP
  7. MP1

    Remote Controlled on/off, reset and eject for computer

    Oooooh!!!! bypassing safety switches!!???!!!! How about adding a function to the remote to do this rather than a piece of wire? You might be glad you have these safety features some day. MP
  8. MP1

    Power Supply +5v with Zener

    They both dissipate power as I stated previously. How much a regulator dissipates in dependent upon what is put into it. Yes, when there is no load, this is a different situation. But sometimes, in looking at the trade-off, a zener is more desirable to use. ....and of course, when someone posts...
  9. MP1

    Light Switch

    Hate to pop anyone's bubble here, but the diagram from the data sheet is using PNP transistors. 2N2222 and 2N3904 are NPN. If you are going to change the transistor in the diagram, you should stay with PNP type. Also, PNP are better to use because a ground on the base will turn it on rather than...
  10. MP1

    Its about AC power distribution...

    audioguru, the original request was for a way to switch the power with a microprocessor. That is the first message I see in this thread. It was you and ante who went into a discussion of triacs. You might want to go back about 7 posts and read again. You would rather groovy has limited options...
  11. MP1

    AT computer power consumption

    Most AT cases were common with a power supply that can handle all of the devices you have mentioned. If you find that you are adding Y connectors to add peripherals it is time to stop and think about it. MP
  12. MP1

    regulators

    It really depends upon what the circuit is doing after it receives the regulated voltage. Try this, make a simple regulator circuit on a breadboard to power something on your workbench. Try this with and without a capacitor on the output of the regulator and watch the voltage fluctuations as the...
  13. MP1

    Light Switch

    Siddharth, The diagram below is actually from the 78XX data sheet. MP
  14. MP1

    Power Supply +5v with Zener

    The 7805 also dissipates power. That is where the heat comes from. Any device that generates heat has power loss. MP
  15. MP1

    Its about AC power distribution...

    Groovy, I would also like to offer another alternative. The circuit below could be duplicated for each control pin of the microprocessor and the relay controlling the 220V line. When you send a 0 to the microprocessor pin connected to the base of the transistor, the transistor is on. Now you...
  16. MP1

    Smart card PC emulator

    Thanks John, I was lost. Timaco welcome to the community: This circuit is dependent upon the device not sending and receiving at the same time. This is how half-duplex transmission works. I have seen quite a few manufacturers do this to save a few parts when full duplex is not needed for the...
  17. MP1

    Light Switch

    It seems that you are looking for this reaction between the trimpot and LDR to simulate a comparator. In that case it might work well enough for your purpose. It would not be hard to breadboard and see. I do not know the specs on the LDR. You might be able to get rid of the trim pot and make the...
  18. MP1

    Need help making a headphone amplifier

    I agree. Elliott Sound Studios has quite a few schematics on the web. I see several sites with links to his when I am searching for information on google. MP
  19. MP1

    Light Switch

    Not very effectively. The LDR will be fighting the trim pot with a parallel resistance. What are you trying to accomplish with this circuit? A variable power source dependent upon light? The center leg of the 78XX series regulators are meant to be at ground potential for the rated voltage. If...
  20. MP1

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

    ginji, thanks for the update on the project. I would also be interested in an easy method of building transformers if your dad would not mind sharing. There is a post and an article on this website but it is very difficult. If you could do this, please add as a new post so that the subject is...
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