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Recent content by contau

  1. C

    Help about 5 Watt FM PCB design

    To work at radio frequency, i must build a simple L,C meter at operating frequency to calculate inductance, capacitance and resonant value. Sometime, i test 120pico capacitor and know that it is inductor at the working frequency but that is depended on the manufactor and often be right with...
  2. C

    Help about 5 Watt FM PCB design

    Would you pls explain the red line? The decoupling capacitor value in low frequency is very larger than rf but it also stay at power line of each part.
  3. C

    Help about 5 Watt FM PCB design

    The audio noise maybe come from power supply of vco. Due to high power, the high frequency loop current is very large. It makes electro-magnetic field that interference with driver stage. how to reject it?
  4. C

    Help about 5 Watt FM PCB design

    So how to revent interference between electro-magnetic field of high power part with driver stage?
  5. C

    Help about 5 Watt FM PCB design

    So is it possible to integrating high power with its driver stage in one circuit copper board?
  6. C

    Help about 5 Watt FM PCB design

    My question about PCB not circuit principle. If seperating power and driver stage on two different board, it will operate very good.
  7. C

    Help about 5 Watt FM PCB design

    Thanks your answer. The harmonics of transmitter can rejected by filter circuits, so it is not problem. The interference between high frequency current of 5 Watt circuit with driver stage make noise at the audio input and unwanted oscilation. I try to shielding and guarding, but it hardly...
  8. C

    Help about 5 Watt FM PCB design

    Hi all, I have a question about PCB. Pls help me. How to integrating 5 Watt FM cỉrcuit (100Mhz) with 0.5 Watt driver in circuit board?
  9. C

    Range of FM transmitter

    How many meters are range of 0.5W FM 100Mhz transmitter ?
  10. C

    Maximum clock frequency of 74hc393N

    Maybe easy for u but not for me. I have only 74hc393N, so i try to get the fastest clock as it can. - - - Updated - - - yes, when running beyond limit, the frequecy is easy to "drift". But i don't know the moon can make it change(^^)
  11. C

    Maximum clock frequency of 74hc393N

    Thank u for answer. I want to know the maximum clock of 74hc393 even larger than in spec. The max i test is 110 Mhz. I don't know the limit of clock. Anyone can tell me know?
  12. C

    Maximum clock frequency of 74hc393N

    Hi, What is the maximum frequency of NXP 74HC393N?. In Datasheet, the max is 106 Mhz. I used it for prescaler, the clock up to 108-110Mhz. Can i get bigger frequency?
  13. C

    Problem with converting S to Y matrix

    Hi, I have a trouble about converting S to Y matrix of 2SC3355 transistor. The converted Y matries are here: **VCE= 10 V, IC= 20 mA, ZO= 50:  200MHz: y =[0.0079 + 0.0028*i , -0.0001 - 0.0008*i; 0.1168 - 0.2403*i; 0.0004 + 0.0011*i] 400Mhz: y =[0.0095 + 0.0032*i ,-0.0001 - 0.0014*i...
  14. C

    Asking about transistor type

    Please tell me some transistors having same type with 2N3866, operating in 100Mhz, 0.8~1 W and easy to find. Thanks
  15. C

    Help me fix the noise in a FM receiver with AC/DC rectifier

    Yes, retransmit signal is oscilator signal inside the circuit. I have no any test equipment. I do this like a "amateur radio". The circuit receive the local signal and amplify audio, just simple like that. its performent is quite nice.
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