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Recent content by ahmann

  1. A

    Need help with Colpitts crystal oscillator

    Thanks guys. I assume that I am done with Colpitts part. Now Iam working with differential amplifier part. However, It is difficult for me to determine capacitor and resistor values. What values I should use for bypass capacitor connecting my output of colpitts and input of amp for 10 Mhz...
  2. A

    Need help with Colpitts crystal oscillator

    Thanks so much E-desing! I have decided to go step by step to comprehend every details of oscillator design. Firstly, I decided to focus on Colpitts part without buffer. I dont want my transistor to get into SAT state. I designed my circuit by considering what you wrote before. This is the...
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    Need help with Colpitts crystal oscillator

    no idont think that it will affect much the circuit
  4. A

    Need help with Colpitts crystal oscillator

    It will be SC cut, 800K min Q, Co=4.3pF,C1=5.5fF, R1=10 ohm max. according to the datasheet. Since freq will be 10 Mhz, I calculated L as 47 mH. To satisfy Q value R must be around 4 ohm
  5. A

    Need help with Colpitts crystal oscillator

    Also R4 value should be 4 ohm for Q around 800 K.
  6. A

    Need help with Colpitts crystal oscillator

    thank you so much for your interest! I tried the circuit with 2N3904, and it seems working. However, I couldnt get pure sinusoidal and the FFT didnt seem promising. Then I tried the circuit with 2N2857 which I have to use. In this case the output was not even closer to sinusoidal. I am adding...
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    Need help with Colpitts crystal oscillator

    Thank you so much for your help! However i tried the values you gave me and my circuit doesnt start oscillating. Maybe it is because i am using different kind of transistor. Can you check the topic and share your precious ideas for me? thanks https://www.edaboard.com/threads/268534/
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    10 Mhz Colpitts Crystal Oscillator

    Ok Dave:) I will be more specific. The part until the just after first transistor is basic colpitts. So i just put necessary components to pre-specified places. However i dont know how to choose bias resistor and capacitor values. The second part is nothing but a buffer to isolate circuit from...
  9. A

    10 Mhz Colpitts Crystal Oscillator

    With all due respect but I think the link you posted is not about crystal colpitts.
  10. A

    10 Mhz Colpitts Crystal Oscillator

    Hello guys! I am new to this forum and new to RF circuit design. I am trying to design 10 Mhz Colpitts Crystal Oscillator with BJT. My input is 5V DC and my output will be 10mW sinusoidal on 50 ohm. I found a design from previous years and have been working on it, however, since I am not...
  11. A

    Need help with Colpitts crystal oscillator

    I have the same question. Are there any suggestions?
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