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Hi,
- The low frequency voltage has an amplitude of 1-10mV
- The higher the frequency of the signal the lower the amplitude. The amplitude decreases as a power law of the frequency. The 30-50Hz range is at least 10 times smaller that the <1Hz
- The ADC is irrelevant here because I amplify the...
The last parameter would be performance/quality. I see a lot of examples of high-pass filter with electrolytic capacitor, I was wondering why. I was also wondering if there was some sort of trade-off between size/price/life and quality.
Hello everyone,
I need to high-pass filter a signal before feeding it to an ADC.
Properties of the signal:
- Frequencies in the 1-100Hz range. I am mostly interested in the 1-50Hz range.
- Low ampltude (a few 1-10mV).
- Always positive.
I was considering a 20uF capacitor in order to filter...
Yes but this is the "theorical" throughput, not the real over the air throughput which is really lower.
The classic is a few times faster than the BLE. And the BLE is <10kBit/sec
Not sure about this.
The RN4020 (BLE) has an OTA Throughput of 7kBit/s
I looked into other non BLE module and they had about 40kBit/s maximum rate.
Really far from what is required. But I would love to be proved wrong on this...
This is why I think the second solution is better: Wifi handles the communication with the server (sends the large chunk of data), while BLE is used for the communication with the phone.
I think your question is also related to compression.
The signal is a chain of 16 bits integer coming from...
Hi,
I am currently working on a wireless device that needs to transfer about 20Mo of data in a reasonable time (< 5 min) to a distant server. The device is controlled by a smartphone so the data can navigate through the phone before going to the distant server.
I see 2 possibilities:
- A dual...
Hi!
I want to build an oximeter, and for that I need a bi-color led with wavelength of 760nm and 850nm.
I found some here: http://www.ir-led-shop.de/Zwei-und-Mehrfarbige-LED/Zweifarbige-LED/760-850-nm/, but the minimum quantity is 100, and I need only a few (3 or 4).
Do you know of any...
I would like to understand how to select an Instrumentation Amplifier for a given task, here low noise at low frequency (0-100Hz). The gain G is about 20 and the input signal has an amplitude of about 50uV. I am also interested in the CMRR but in this example we will ignore it and focus only on...
Yes, that is exactly why I'm trying to reduce the supply voltage of the circuit. A 3.5-4V battery is way cheaper and easier to find than 6V
Any comment on this?
Yes you are definitely right, I am using the 7805 to power the AD620 with 4 alkaline cells (> 6V).
But I am also planning to replace the AD620 (and the CA3130) that both require 5V supply voltage with newer pieces that use lower power (<= 3.3V if possible). Without loss of performance. And for...
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