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I removed the buffer and connected the AM directly with the delay crcuit. But I added a 100nF cap in between the AM output and the delay input. I am able to get the correct signal after this procedure.
I will get back to this conversation if problem occurs again in the next few days. Guys...
When I replace the AM signal to a functional generator signal, I am able to get the output signal from the buffer. Is it due to some interface between the AM and the buffer ?
Added after 3 minutes:
Can I use a small signal amplifier to amplify the signal before feeding it to the LM7121 buffer?
Hi flyingSky, Actually I am not able to get any signal from the buffer.. The signal from the AM is lost probably due to noise. My project supervisor told me to increase the amplitude to about 2 to 4 Vrms before feed the AM signal to the buffer(LM7121). Which mean I may need another buffer to do...
+conclusion about small signal amplifier
1) The frequency is between 36 kHz to 44 kHz. Fc=40kHz, fm=4kHz. Therefore, the signal outputs are fc+fm, fc-fm and fc.
2) The LM741 is only able to generate the same signal. unable to amplifly it.
Initially, I was using LM7121 (as in the attached...
lm6628 datasheet
The signal that is supposed to be fed to the amplfier is a signal output from Amplitude Modulation IC. It has very low amplitude (about 500 mVrms). I need to feed this signal to a time delay circuit.
When I connect both circuits together, I am not able to get any signal out...
lm6628
Hi all, I need to amplify a small signal which is about 500 mVrms (an AM signal) to about 2 to 4 Vrms.. What kind of amplifier ICs I could use? I tried using LM741 but it is not able to do the job. I need to build up this circuit urgently. Please help.. Thanks
How do I design an unity buffer (non-inverting) using a transistor(2N3904) ? The input comes from an amplitude modulation circuit with carrier frequency of 40kHz. Therefore, the bandwidth should also be considered.
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