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  1. walid1

    Antenna

    Hi Alun I read in some web page that we can match the final stage with the antenna using matching C-L-C If you want i give you the address
  2. walid1

    MIC coupling capacitor

    No Alun, I believe that AUDIOGURU is the king of this community and he can answer any electronic question. May be he buisy (worked)
  3. walid1

    Photodiode terminals

    No no no Alun If i removed one from some board and want to reuse it how can I identify its K &A
  4. walid1

    What are these abbreviatives mean

    Thank you Alun i hope somebody else tell us  the remaining two
  5. walid1

    Photodiode terminals

    If I have a photodiode on my table, how can i identify its cathode and anode using didital multimeter? tanks.
  6. walid1

    crystals in series or parallel

    In some circuits I see four 20MHz crystals in series or sometimes in parallel! What's equivalant value then?
  7. walid1

    MIC coupling capacitor

    Hi AUDIOGURU Where are you................I wait your answer thanks
  8. walid1

    What are these abbreviatives mean

    What are these abbreviatives mean: QRP QSO NFB circuit thanks
  9. walid1

    Voltage control oscillator VCO

    To AUDIOGURU (1) Quote [1) I built the circuit that someone complained about, it didn't work with a new 9V battery, and also didn't work when the battery was a little old.] Are you mean that when the battery become less than 9V old (2) Quote [2) I added a low-dropout voltage regulator so that...
  10. walid1

    Voltage control oscillator VCO

    To Staigen (1)   Quote [i usally dont calculate coils and resonanses the way you did here, i use a nomogram for this.]   I also use MATHCAD program, i made many pages to calculate any thing like LC and others, but i do what you see because there are other people read what we are writting so...
  11. walid1

    Voltage control oscillator VCO

    i want mor info about designing a VCO to Audioguru only put the analysis and calculations of you FM Tx cicuit
  12. walid1

    Voltage control oscillator VCO

    Hehe thank you staign but still........
  13. walid1

    100 uH coil

    I go to the 3W FM transmitter project which uses five RF chokes==> L2,L3,L5,L7,L9  5  6-hole Ferroxcube Wide band HF Choke (5 WDG) but i can't understand anything from this "6-hole Ferroxcube Wide band HF Choke (5 WDG)" can you explain? thanks
  14. walid1

    100 uH coil

    OK OK guys it is 100uH coil and i can't purchase it, can i use a piece of ferrite rod and wound some turns on it? IF this OK what values (rod length and diameter, n turns etc)
  15. walid1

    Voltage control oscillator VCO

    Hi Staigen Thank you very very much for this great explaination Ceq = (1/(1/20pF+1/3.9pF))+15pF+(1/(1/1nF+1/20pF+1/10pF)) as you said Ceq =      (3.2636pF)    +15pF+      (0.8696pF) ceq = 19.133 pF Now there are three caps to the left of L and three caps to the right of it. To calculate L i...
  16. walid1

    A chock coil

    I have not oscilloscope or other devices to monitor the change so i ask
  17. walid1

    Differences between MC3361 & MC3371

    Is there any difference between MC3361 & MC3371, and can one of these be used in place of other, thanks
  18. walid1

    Jr.Member

    What the meaning of Jr, thanks
  19. walid1

    picture under my name

    hi all, i want to put a picture under my name as you do but i don't know how! Please tell me.
  20. walid1

    Dots in transformer symbols

    hi Alun Assume that I have a transformer and I want to put its dots. I put it in a circuit, connect its primary with suitable AC volt then monitor the i/p & o/p on an oscilloscope if they are in phase I must put the dots on the primary and secondary points that connected to the +ve (center...
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