Search results

Search Forums New Posts
  1. walid1

    Infrared Remote Control

    Hi guru are u mean the Tx freq? OR u mean the Rx freq through R1 and C1, and if it respond to some freq what the output at pin 3 of the nand gate thank you very much
  2. walid1

    Infrared Remote Control

    Try to forget this MOD I have one and its datasheet, i know its pins and wait your answer to costruct the circuits above i want to get logic 1 or 0 or any thing else at pin 3 of the nand gate when someone pass, is this possibe or not, or you have a better idea please tell me thanks
  3. walid1

    Infrared Remote Control

    Hi guru look at the two figs below, If i use these circuits as Tx and Rx, and put my idenyified MOD.... that is if i put and aligned these two circuit
  4. walid1

    Infrared Remote Control

    Hi guru ok, lets agree that Radio Shack doesn't have the specs for the MOD anymore so nobody knows what it does. i need you help in designing a gate guard using IR MOD as RX and IR diode as Tx i baught  the RX mod's i search the net but no circuit satisfied me i want your help guru so please...
  5. walid1

    Infrared Remote Control

    Hi from this link:  http://home.maine.rr.com/randylinscott/aug98.htm Iread the following: The MOD accepts a 40khz IR signal that is modulated at 4 khz. When a signal is received the MOD will go low. The sensitivity of the MOD is set by different values for R1 and C1. from that I understand...
  6. walid1

    a very new Idea

    Hi my friend asked my help in his design he wants some sensors placed some where in a gate that counts the visitors come in or out. when the number inside the room is say ten, the gate must closed and prevent more people from inteing i tell him that he may use a controller like PIC16F84A and...
  7. walid1

    Transistor combinations questions

    the two switches must not closed at the same time to avoid short circuit
  8. walid1

    Audioguru FM Tx

    Hi guru How to do this?
  9. walid1

    Audioguru FM Tx

    hi guru quickly =15, 30, 45, 60 .... hour!
  10. walid1

    fm

    are u mean that the tapped coil acts as a step down auto transformer!
  11. walid1

    fm

    hi Are u mean by "things getting near the antenna " my hands, and why when connected to the tap of the coil the osc be more stable
  12. walid1

    Tunning

    Hi the motor acts simply as your hand i have a remote controlled cd, when i press the + or - volume i can see the volume nob rotate it is connected by a motor rotate in two direction as the polarity applied on its terminals For the Varactor diodes, i can add to what my big friend guru said...
  13. walid1

    Transistor Question

    yes it is very small like that I'm pleasure, it is the first time i can help a friend in this great community good luck truf always I get all my project's parts from my old junk so i check them especially the transistors, you can say that i check more than 5000 transistors in that way and...
  14. walid1

    Transistor Question

    I understand his question in another way may be he ask like this if he has a transistor on the table and he wand to identify its terminals and type use your digital multimeter diode function, first assume your trans is npn type, then put the red wire in one leg and the black on another leg...
  15. walid1

    Audioguru FM Tx

    Hi guru I HOPE U READ IT ALL I understand u but i intend to use this inside a building of 4 floors, i want to talk while move from place to place, may be inside the lifter ........ when i first test it with that problem mentioned above my son talk near mic inside a room while i'm going away...
  16. walid1

    Audioguru FM Tx

    hi guru What did u mean by:"has a range to a good FM radio with nothing in between of more than 2km." nothing like what thanks
  17. walid1

    Audioguru FM Tx

    hi audioguru i can not discribe exactly what going with me but i'll try hope that u understand me 1) when i tune it to some freq i noticed that it be in a wide region that is it cover from 97 to 102 MHz, strong at the center and gradually weak to other sides 2) the recieved sound is 80% hum...
  18. walid1

    Audioguru FM Tx

    Hi again At first i hear my self near 106 MHz but it very weak voice strong noise then few seconds later Q3 was very very hot my power supply now is 12 volt 7A small battery why Q3 is so hot thanks 
  19. walid1

    Audioguru FM Tx

    Hi I do what guru told me, isolate the amp circuit and remove C4, then measure voltages at points mentioned at the above figure and i had the following results: Vcc 4.96v VB 0.74v VC 2.43v VE 0.12v AT MIC 3.14V not 2v as guru when connecting my 10 watt amp and talking near the MIC i hear my...
  20. walid1

    transformers

    Hi Jean-Noel Welcome to our forum 10 years ago when the electricity company suplied us only 170vac instead of 220, i had a step up transformer. One day it burned and emitt abig amount of smoke i decide to rewound it and simply did the following: got a paper and a pen to write notices open...
Top