Timeline for IR Demodulator Design
Current License: CC BY-SA 3.0
11 events
| when toggle format | what | by | license | comment | |
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| Apr 17, 2012 at 11:38 | comment | added | Telaclavo | I can. Just give me piles designed for fc=2 Hz. | |
| Apr 17, 2012 at 11:15 | comment | added | Russell McMahon♦ | @Telaclavo - brave the man who can locate a single RC pile to 1 Hz :-). But yes, a 2Pi in order. More or less. | |
| Apr 17, 2012 at 11:15 | history | edited | Russell McMahon♦ | CC BY-SA 3.0 |
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| Apr 17, 2012 at 11:06 | history | edited | Russell McMahon♦ | CC BY-SA 3.0 |
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| Apr 17, 2012 at 11:05 | comment | added | Telaclavo | And the cutoff frequency for the OP's C16/R31 is 331 Hz, not 2 kHz. That is too low. I would use C16=220 pF and R31=50 kohm, to have at least fc=10 kHz, and filter all the noise up to those freqs. | |
| Apr 17, 2012 at 10:57 | comment | added | Russell McMahon♦ | @Telaclavo - ah thanks - missed that. Writing too large for my brain :-). | |
| Apr 17, 2012 at 9:39 | comment | added | Telaclavo | R31 keeps the opamp biased at VGND (2.5 V), not GND. So, no distortion from that. | |
| Apr 17, 2012 at 9:36 | history | edited | Russell McMahon♦ | CC BY-SA 3.0 |
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| Apr 17, 2012 at 9:28 | history | edited | Russell McMahon♦ | CC BY-SA 3.0 |
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| Apr 17, 2012 at 8:29 | comment | added | Jason | I derived it from a few text references I have. :) I just realized that I screwed up when drawing AND simulating the circuit. R17 is supposed to feed back to the inverting terminal which gives the DC path. I'll have to edit my question in the AM. | |
| Apr 17, 2012 at 8:00 | history | answered | Russell McMahon♦ | CC BY-SA 3.0 |