Recent content by ryanleung

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  1. R

    CMOS

    What is the differences between the static power dissipation and the switching power dissipation in a CMOS inverter and what parameters that affact the switching power dissipation?
  2. R

    amplify the power (infrared)

    Yes And I have a some question to ask you.  My oscillator can not adjust the frequency to 38kHz.  I use 220nF capacitor and 180uH inductor and I can not decrease the frequency anymore.
  3. R

    amplify the power (infrared)

    How can i increase the transmit distance? now, it can work 6-8 inch only
  4. R

    amplify the power (infrared)

    The circuit can sucessfully received the signal.  If I want to add the Automatic Gain Control(AGC) to the receiver, how can I do????
  5. R

    amplify the power (infrared)

    The red circle voltage measured is not 5.9V, it is 9V same as the VCC Is it no current though the IR LEDs?
  6. R

    amplify the power (infrared)

    Ok, I will try it. thanks
  7. R

    amplify the power (infrared)

    how about the distance, the signal is very weak
  8. R

    amplify the power (infrared)

    hello audioguru~~ I have are few question about my project. 1.  I constructed your receiver already.  And I amplified the signal using opamp, then it was connected to the audio amplifier.  But the sound is very weak.  I try to adjust the volume but the sound is also weak.  I don't know how to...
  9. R

    amplify the power (infrared)

    The resistor is 40ohm and the capacitor is 0.1uF. The frequency is 38kHz. Is it right? f=1/(2*pi*R*C)
  10. R

    amplify the power (infrared)

    should I amplify the signal again?(tansmitter and receiver)
  11. R

    amplify the power (infrared)

    two resistors? the AM detector means the envelope detector?
  12. R

    amplify the power (infrared)

    Hello audioguru, I constructed your transmitter and the receiver circuits already.
  13. R

    amplify the power (infrared)

    hello audioguru. My AM transmitter output signal is 9.2Vp-p. And I changed the R1, R2, C and R3 to 2.7kohm, 10kohm, 0.01uF and 1Mohm.
  14. R

    amplify the power (infrared)

    sorry, I don't know your mean. can you draw a circuit to me, thanks!!!
  15. R

    amplify the power (infrared)

    umum...... How can I modify it now? Thanks
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