ryanleung
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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?
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amplify the power (infrared)
ryanleung replied to ryanleung's topic in Electronic Projects Design/Ideas
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. -
amplify the power (infrared)
ryanleung replied to ryanleung's topic in Electronic Projects Design/Ideas
How can i increase the transmit distance? now, it can work 6-8 inch only -
amplify the power (infrared)
ryanleung replied to ryanleung's topic in Electronic Projects Design/Ideas
The circuit can sucessfully received the signal. If I want to add the Automatic Gain Control(AGC) to the receiver, how can I do???? -
amplify the power (infrared)
ryanleung replied to ryanleung's topic in Electronic Projects Design/Ideas
The red circle voltage measured is not 5.9V, it is 9V same as the VCC Is it no current though the IR LEDs? -
amplify the power (infrared)
ryanleung replied to ryanleung's topic in Electronic Projects Design/Ideas
Ok, I will try it. thanks -
amplify the power (infrared)
ryanleung replied to ryanleung's topic in Electronic Projects Design/Ideas
how about the distance, the signal is very weak -
amplify the power (infrared)
ryanleung replied to ryanleung's topic in Electronic Projects Design/Ideas
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 increase the signal. And the maximum distance only have about 5cm that is very short. 2. I constructed the envelope detector (R=40ohm, C=0.1uf) and connected to your receiver output but the envelope detector output have not output signal. thanks -
amplify the power (infrared)
ryanleung replied to ryanleung's topic in Electronic Projects Design/Ideas
The resistor is 40ohm and the capacitor is 0.1uF. The frequency is 38kHz. Is it right? f=1/(2*pi*R*C) -
amplify the power (infrared)
ryanleung replied to ryanleung's topic in Electronic Projects Design/Ideas
should I amplify the signal again?(tansmitter and receiver) -
amplify the power (infrared)
ryanleung replied to ryanleung's topic in Electronic Projects Design/Ideas
two resistors? the AM detector means the envelope detector? -
amplify the power (infrared)
ryanleung replied to ryanleung's topic in Electronic Projects Design/Ideas
Hello audioguru, I constructed your transmitter and the receiver circuits already. -
amplify the power (infrared)
ryanleung replied to ryanleung's topic in Electronic Projects Design/Ideas
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. -
amplify the power (infrared)
ryanleung replied to ryanleung's topic in Electronic Projects Design/Ideas
sorry, I don't know your mean. can you draw a circuit to me, thanks!!! -
amplify the power (infrared)
ryanleung replied to ryanleung's topic in Electronic Projects Design/Ideas
umum...... How can I modify it now? Thanks -
amplify the power (infrared)
ryanleung replied to ryanleung's topic in Electronic Projects Design/Ideas
oh....sorry..... I have some question about my transmitter. I constructed the receiver already and I used the remote control to test the receiver. The receiver can receive the signal. If I used my transmitter to transmit the AM signal, the receiver can receive the signal but the signal is small. how can i modify the transmitter? the input signal only have about 1Vp-p, should i amplify the signal first? -
amplify the power (infrared)
ryanleung replied to ryanleung's topic in Electronic Projects Design/Ideas
ok thank you~~~ -
amplify the power (infrared)
ryanleung replied to ryanleung's topic in Electronic Projects Design/Ideas
how to check the opamp which can satisfy the 38kHz operation? -
amplify the power (infrared)
ryanleung replied to ryanleung's topic in Electronic Projects Design/Ideas
I used two IR LEDs already. -
amplify the power (infrared)
ryanleung replied to ryanleung's topic in Electronic Projects Design/Ideas
1. can I change the value to R1 =100kohm ,R2=2.2kohm,R3=1Mohm and C=0.01uF??? 2. can i use the TL072? 3. should I construct the band pass filter to filter the fluorescent light and the noise? -
amplify the power (infrared)
ryanleung replied to ryanleung's topic in Electronic Projects Design/Ideas
I connected the pin4 to ground already and the signal was amplified. The problem occur at receiver or transmitter? Or the output power of the transmitter insufficient? -
amplify the power (infrared)
ryanleung replied to ryanleung's topic in Electronic Projects Design/Ideas
R1 = 470ohm; C1 = 0.1uF; R2 = 1kohm; R3 = 10kohm; IC = LM324 -
amplify the power (infrared)
ryanleung replied to ryanleung's topic in Electronic Projects Design/Ideas
but my project requirement must use AM to transmit the audio signal. How can i amplify the power and increase the distance??? -
amplify the power (infrared)
ryanleung replied to ryanleung's topic in Electronic Projects Design/Ideas
Sorry, this circuit is old version. I changed the frequency to the 38kHz already. But the distance between the transmitter and the receiver is very short. How can i increase the distance? increase the power? I don't know how to increase it. -
I would like to use this circuit to transmit the audio signal.