noise

Hello there, The backgorund: I'm working in an audio module using an electret microphone and a MAX4466 amplifier, I'm using the layout recommended in the MAX4466 datasheet (datasheet Figure 2), with the only difference being there is a 100 nF cap between the MIC+ and MIC-, the presence of said...

Hi, I want to plot frequency vs nv/√Hz in labview. My signal is collected with daq assistant. NI provides a vi for plotting noise in figure 2. But I have problem connecting daq assistant and this vi. Anyone can help me please? By the way I am not permitted to view NI community, so I couldn't ask...

Hello all, I have a Bidirectional, Dual Active Bridge board that is based on the TIDA-010054 from Texas Instruments. However, whenever a DC bus is applied (even as low as 50 VDC), the 3.3 V PWM signals at the power board exhibit strong ringing/glitches correlated with the switching edges (PWMs...

We've (@rpschultz) recently discovered that the buffer circuit we have in our upcoming tuner makes a nasty high pitch noise if the output is plugged into an amp and there's no input cable connected to an instrument/guitar. We're currently using the TL072 option (ignore the OPA1642 in the...

I have 03 different pairs of shielding twisted cable (STP) all going side by side and are connected to an LRU. 02 pairs are of input while one pair is of output from LRU. Pair 1 has power supply of 5v and ground. Pair 2 has voltage input in mv with ground. Pair 3 which is the output pair has 03...

Hello all, I'm having this issue where my Fly-back power supply is not outputting clean 24VDC. I have attached images of what the scoped waveforms looks like Gate voltage at FET: Scope CH1 Yellow FET drain voltage: Scope CH2 Blue Gate voltage at pin 19 of LT8316: Scope CH3 Purple Output...

How to SafeGuard against EMP/High Frequency Attacks, Forced System Reset and Force System Failure IMPORTANT: I cannot use a microcontroller because of my living conditions whatever electronic that I own which contain firmware/software is vulnerable to re-programming attacks hence I can only...

Hello everyone, I'm currently making a test machine for testing (voltage, frequency) PCBs. There are 5 test points on PCB where I need to measure frequency 20MHz. So, I'm using relay to switch around test point and connect to the probe of my oscilloscope (Keysight DSOX1202a). I've found out that...

Hey. I have a question about noise figure and attenuator. Lets assume we talk about 1Hz BW and the Thermal noise is -174dbm What happens if a signal with a power of -168dBm is going to a 10dB attenuator? is it possible to get below Thermal noise? and what happens if I put 50ohm at the input and...

Hello. I'm now designing the I/O Control Board by using ESP32 MCU. 24Vdc Relay will be used for Contact Output. During Turning ON the relay for the AC 220V load by using 24V relay, 5V, 3.3V, 24V DC Power is ringing fastly (tens of nano seconds). There's a freewheeling diode for coil. so, it's...

Hi. I have an RC circuit 1kOhm and 22uF that generates a sine wave from a PWM signal generated by a battery powered STM32F103C8T6 (Blue Pill). I take all measurements with a handheld oscilloscope (battery powered). The PWM frequency is 10kHz. I noticed that the connection order affects my...

Hi there A bit of an electronics novice here, forgive the lack of knowledge. But I'm trying to record my voice to my laptop via a USB-powered audio interface (it has USB cable for both power and data). A low hum has appeared which gets worse if I touch my mic body, and almost goes away...

While observing the audio output of my smartphone on the oscilloscope, I noticed a signal being generated when I touch the touchscreen. This signal is around 500Hz and appears in groups of 3 peaks, with intensity proportional to the skin/touchscreen contact area: The output is from an AUX cable...

Hello all, I have 2 almost similar PCBs for voltage and current measurement. I have used 230VAC from the outlet to test them both. The circuit in both boards is similar which is just a voltage divider to reduce the input voltage (see attached image). but I got some noise in one of them even...

Hello. I am trying to prepare a filter and amplifier circuit for a strain gauge (Wheatstone bridge in half-bridge configuration). Input power to the Wheatstone bridge is 1 VDC, and each output (+ve and -ve) of the Wheatstone bridge circuit goes the filter. The filter is a second order active...

Hi, I am still relatively new to microprocessor circuits. Please tell me how I can reduce or eliminate the noise introduced into the circuit below? I have a half-decent power supply with a stable output voltage(input about 12 volts, output about 5 volts): But there is noise in the...

Here is the circuit: Here is the solution (taken from the book RF microelectronics by Behzad Razavi): My attempt: First i tried to find the gain expression for this circuit, i noticed that M2 is in diode configuration so in the small signal model M2 is equivalent to a resistor (=...

Hello everyone. I have a sensor that I am continuously reading data from, at a constant rate, using python. Looking at the data there is obviously noise in it (bounces around when it should be zero or a constant value). After googling for 2 days I've not been able to find a way to remove the...

If I sample a thermocouple at a slow rate such as 1 Hz, do I need Low Pass Filters? I'm not aware of any noise sources that are that low in frequency, and since I'm sampling so slowly, does this by default eliminate noise contributions in the high frequency ranges?

Hi, everyone! I've made a LED buck-boost (BB) driver based on LM3429. It's for automotive lighting, so Vin = 9-14.5 V, LED string consist of 10 white leds. V_out is about 30V, I_out=1.3A. All components were calculated according to LM3429 datasheet for BB topology. All datasheet recommendations...