Analog and audio

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Hi,I'm looking for advise concerning a low power voltage reference using NPN transistor as following :Q2 is used as diode (with negative TC)Q3 is used as zener diode (with positive TC)This circuit create a temperature-compensated +6V reference.So my question is what parameters of Q3 permit to obtain +6.2V ?With the same reference, provided by different manufacturer, we found different zener voltage.If someone have the answer of this issue (or an equation), I take it !By advance, thank you.BR

i read the data sheet about FDA801 and try to read DB data , the data i read were all 0x00 ,But none of the speakers came through , i think there is something wrong in my process procedure . Here's how I tried it:May I ask if this process is correct?thanks if i initial FDA801 to play state , and the i read IB data ,it works:Because it satisfies process figure 51.a

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I am trying to interface FDA903D EVK with S32K148 EVK, but not able to access I2C registers.Is there any sample code or Example code available that I can take as reference?

Dear Sir/Madam,One is from mouser and the other is also from an authorised distributor. When used, it was found that LM358DT part from mouser was working properly and the part from the other distributor was not working properly. I wanted to know why is there a difference between the working of both the parts. Hope you would help me.

Objective: I am trying to perform a basic comparison between two values via TS332 comparator. Details: The comparator's inputs are output from Nucleo STM32L432KC DAC. The code for DAC values generation is verified using the internal comparator which works perfectly. The Nucleo board is equally used to supply the comparator (3.3V & GND). A pull-up resistor of 10 kOhm is connected between the positive supply voltage and the output.Problem: The output is always HIGH except when the inverted input (-) of the comparator becomes equal to the supply voltage ! Does anyone have an insight on what may be the cause of such behavior? Thank you in advance.

I have a concern about using the TSX3704 due to a possible power-up glitch. The scenario is something like this:Each input will be driven prior to the application of power to the IC's VCC. The inputs will have series resistance on the order of 100kOhm to keep any appreciable current from flowing in the input's ESD diodes prior to VCC activation. This will cause both inputs to be approximately equal (VCC - ESD voltage drop) until VCC is great enough, at which time the ESD diodes stop conducting. In my application, VCC begins to rise about 5msec after the inputs are active, and rises from 0 to 12V in ~1msec. The voltage driving the inverting terminal through a series resistor is a 2V reference and there is no appreciable capacitance at the inverting terminal. Therefore, the inverting terminal will track VCC as it rises until VCC is greater than ~1.4V (2V - ESD diode drop). The voltage driving the non-inverting terminal is 2.2V, again through a series resistor. Similarly, a

The examples only support the digital MEMS microphones on the board. I'm uncertain whether the BSP actually supports using analog in. The wm8994.c driver supports analog in, but I'm not certain this function is actually being called by the higher abstraction layers. Again hardware background, so it's difficult to understand all these BSPs, HALs, drivers, callbacks and whatnot. I just need to verify this functionality before rolling out a board with the STM/WM8994 combo. Any advice is appreciated. Thank you very much.

As for the pins marked N.C. on the TDA7297. For ease of pcb routing, are they in fact not connected? Can I route power or ground via these pins? Thanks.

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Hi ST,I designed a TDA7498E evaluation board, but the power is only several Watts, do you know why? Another question is do we need to connect PGND (PIN18 ) to PGNDA or PGNDB, do we need to connect SVCC(PIN35) to PVCCA or PVCCB, and do we need to connect SVSS(PIN36) to PGNDA or PGNDB? Thank you!Best regards,Yuehai

We need your support, thank you!

Hello,I would like to know the difference between the timer TS555IDT and TS555IDTTR.Following the datasheet, it corresponds to the specific requirements : -TR for custom version and blank for public version.However, it is not explained the difference.Are they identical ? Is there a difference in terms of characteristics ?Regards,

What is the max signal input voltage for the TDA7266M? We will be trying to merge a tube preamplifier with a 7266 power amp to make a small guitar amplifier. We can always shunt input signal voltage with a zener as the tube pre has a fairly large output signal.

I am looking to drive 16 Infra Red Leds (1 per channel) at up to 100mA/25% duty Cycle. Doing the thermal calcs, I need to get the output much closer to the 1.35V led Vdrop to prevent excess heat at the STP16DP05 current sinks.

My question is about the 4th pin of 2N2907AHR transistor with UB package type.https://www.st.com/resource/en/datasheet/2n2907ahr.pdfWhat should I do with the 4th pin?Because of regulations and standards, I cannot let it flow. 

I now use sta311b+sta510f, how to configure sta510f output 4 independent channels, instead of 2 - Channel Bridge,Or how to make sta311b in each channel PWM output full  PWM not half PWM, I can only get half the signal, bridge is not a problem TKS!

Hello, I'm trying to measure the ambient noise level in decibels (dB) using the I2S channel for a project. I am novice at stm32 microprocessors. I just want to measure the noise level of the environment. Can you help me? Can you send me a sample project or set of commands. My processor is stm32f412. Thanks.

Hello community,I have been using Nucleo F413ZH for some time. So far I have used ADC for lower speeds and needed nothing more to read the data than STMstudio. Recently I have a problem that I don't know how to approach. I also don't know how to find a solution online (I feel like I'm wandering around). I have 16 microphones, each connects to one ADC channel and thanks to the use of DMA it directs data to the memory. However, I would like to do a cross-correlation of the signals, so I came to the conclusion that I would send the data to the PC or RPi 4b, and I would do the calculations there. But the problem for me is sending so much data from the memory. I don't know how to direct data from adc straight to USB. I read and watched a video about the CDC and its theoretical limitation of 1 MB / s which would be satisfactory for me, but I don't know how to write the code or which functions to use (i need 16mic x10bit x44.1khz ~= 7Mbit/s =882KBytes/s, also i can reduce some mics to 12 of t

Here I attached snap of circuit.

Hi all,My application requires to sample a sensor and send the samples out in real time, without saving the samples.I am required to run a low pass filter on the samples, but here is the problem cause if I want to do it on 20 samples for example then I will not be able to send out the samples each after I got it as required, and when I send them immediately each after I got it I use an ongoing average on 10 samples but that wasn't enough.what low pass filter algorithm is the best for this application?what is the accepted way to do this ?Best regardsJK

Hello everyone,I am trying to get data from 10 ADC channels and want to display all the data simultaneously on the LCD. I successfully get the data from ADC channels but unable to display it simultaneously .Please give me suggestions over it and i am writing code in C language.

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