Recent content by AVRFreakMan1

  1. AVRFreakMan1

    FM Radio

    You should NEVER attempt to measure resistance in a powered circuit. Anyway, remove R4 and it should work. You didn't see the scissors?
  2. AVRFreakMan1

    FM Radio

    Explain more! Did you use a program? What program? What OS? My program runs  only in plain old DOS environment. That means DOS, Win95, Win98(SE) but not any NT based Windows. Have you measured the voltage in B point with a multimeter? Does it change in regular steps?(0 to 5V, @ 5V/255 steps) If...
  3. AVRFreakMan1

    FM Radio

    Found another scan image of the PCB.
  4. AVRFreakMan1

    FM Radio

    I haven't done any changes in this circuit. This is my reply in MP's email notification that I got yesterday: However, I should say a few more words that may not be obvious. 1) The operation range of the varicap in this circuit is 0..5V. The BB329 works up to 32V but here is used up to 5V...
  5. AVRFreakMan1

    My new project

    The idea is doable but I'm not convinced that you have the skills to do it. You could use a microcontroller with a touch LCD but you can't do that with C++ and Win32 API. For that convenient programming enviromment you have to use a Pentium board, like those PC104 style. It is also expandable...
  6. AVRFreakMan1

    LC Metre

    Hi BOHDA, nice to hear that it works. I followed the schematic in analog section. In my experience, it looked ok. It wasn't ok, that's why it doesn't show stable/correct values? The PCB is unclear too and I was too lazy to try to extract the schematic from it! In the breadbording circuit that...
  7. AVRFreakMan1

    CB transmitter

    Some microphones have three leads, othes have two leads. One of those leads is surely the ground(or -V or 0V or GND or Common). Both of these two categories might need supply that take from the third lead, if they have three, or from the second(which additionally serves as MIC_OUT), if they have...
  8. AVRFreakMan1

    CB transmitter

    This circuit is a CB transmitter, not "reciever"(the correct spelling is "receiver"). CB means Citizen's Band. There are microphones that need a small supply voltage(and limited current which is done by the help of the resistor R5) to be able to work(because they have embedded preamplifier)...
  9. AVRFreakMan1

    Looking for to buy a schottky diode

    pdmr, How about this site: http://www.xs4all.nl/~barendh/Indexeng.htm It hasn't the BAT29 diode but it has many other RF schottky diodes which might suit your needs. Look under RF diodes ;-) Kyriakos
  10. AVRFreakMan1

    FM Radio

    L2 is the tuning coil. Just make it: take a thin wire(0,6mm) and make 5 turns of 4mm internal diameter. If it doesn't work try to stretch/squeeze it and if it doesn't work add/remove turns and repeat.(adding turns reduces frequency). If no success, check the PCB and components for errors, or...
  11. AVRFreakMan1

    LC Metre

    I gave up! It doesn't work in any way. Even though I would bypass the LCD because it has a workable connection for a PC COM port, I cannot bypass the fact that it doesn't measure any coil or capacitor. The readings seem random. :-( Kyriakos
  12. AVRFreakMan1

    FM Radio

    If it cannot tune to any station, experiment with the coil. Stretch it, add more rounds...
  13. AVRFreakMan1

    LC Metre

    Thanx MP! Useful info. So the 16x1 LCD that I tried is actually from those 16x1A. I'll test the whole circuit with this LCD in the weekend and see if it's worth the trouble so far. Kyriakos
  14. AVRFreakMan1

    A stand alone sine wave generator using Atmel chip

    Groovy, you haven't seen this? http://www.myplace.nu/avr/minidds/index.htm Kyriakos
  15. AVRFreakMan1

    LC Metre

    Well, the circuit in general is unclear as for the values of many components(L,C) but it is easy to test the digital section without building the analog. A majore error was in LCD data pins. They must be swaped. Where B0 must be B3(B0->B3,B1->B2,B2->B1,B3->B0). The rest data pins...
See more
Top