# Search results

1. ### Magnetic switch for disconnecting the circuit

Hi, I have a cirucit operated from a 12V battery. I am designing a circuit for charging the batteries using inductive charging. The cirucit should be disconnected from the batteries when charging and also when not in use. As the system will be in a closed packaging, I want to access the system...
2. ### Units at the Correlator Output

Hello, I have a confusion about a very basic question I guess. I have a pulse of a known waveform measured in volts. I use a matched filter to detect the presence of the waveform in the singal. The impulse response of the matched filter as we know is the time-reversed version of the...
3. ### Output resistance of an audio amplifier

Hi, I am using LM4950 audio amplifier and I am interested to know its output impedance. There is nothing mentioned in the datasheet except that it can provide 7.5W at 8 ohm load (at Vdd = 12V, 10% THD, and 1 kHz). How do I calculate the output impedance? Regards
4. ### BER when number of received bits less than transmitted bits

Hi, I want to calculate the BER when the number of received bits is less than the number of transmitted bits. For equal number of transmitted and received bits, I can just compare bit by bit and then calculate the BER. The problem is when I miss some bits, then how do I calculate BER. For...
5. ### BMP280 Pressure Sensor Maximum Pressure

Hi, I have interfaced BMP280 Pressure sensor with the Raspberry PI. I measured the atmospheric pressure and it shows the correct value. Then I put the whole setup in a water tight bag and went to maximum 8m depth with 1m increments. The datasheet of BMP280 says that it can measure Max Pressure...
6. ### Sound Transmission loss in water

Hi, I measured the sound pressure levels at different distances using hydrophone as a receiver. Now I want to know where the transmission loss due to spreading is spherical, cylindrical or between the two from the measured data. My data is in volts which can be converted to Pressure using...
7. ### SNR measurements at the output of opamp

Hi, I have a very basic question. I want to calculate SNR at the output of the opamp. First I measured the rms value of the noise without any input using a digital oscilloscope. Then I input a sinusoidal input of 40kHz to the opamp. The voltage at the output was 0-5V. So to measure the SNR I...
8. ### Grounding of analog and digital components

Hi, I am designing a circuit but confused about the grounding. I have read analog and TI application notes but still have some confusion. I have one DSP board and with it I plan to connect my own designed board. In my board, I plan to include: 1) DAC for audio output 2) ADC for analog input...
9. ### Op amp output voltage

Hi, I have a basic question. Suppose my op-amp supply voltages are +/-12V and the input signal is 10V ac signal. Now if the gain (set by feedback and input resistor) is lets say 5. What would be my output? I think the opamp should clip the voltage above the max. supply and below the min...
10. ### Analog switch selection for differential signals

Hi, I want to select analog switch for my circuit design with the following requirements: I want to give differential signals as input to the switch whose common mode voltage is 1.65V and the voltage swing is 0 to 3.3V w.r.t ground. So, if one signal is at 3.3V, the other is at 0V w.r.t...
11. ### Analog switch input voltage levels

Hi, I want to select analog switch for my circuit design with the following requirements: I want to give differential signals as input to the switch whose common mode voltage is 1.65V and the voltage swing is 0 to 3.3V w.r.t ground. So, if one signal is at 3.3V, the other is at 0V w.r.t...