Analog and audio

Real-time clock M41T62 per day leave for 6 minutes henceforth. I found out that the quartz frequency is about 32.9 kHz. Program calibration does not reduce this inaccuracy. Do I have a defective chip or I don’t understand something?

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Hello,i want to use GM68020H to research ,but i can't find out its detail data sheet ,can you send one to me?My email :2664822931@qq.comThank you very much!

I have used STPM34 In my design. I am measuring voltage and current of single phase supply. Line is connected Pin number 9 of STPM34 and neutral is connected with circuit ground via ferrite bead. check R23 in schematic. I have attached schematicMy question is that what will be happen if i connected Line and neutral reverse?

Hi,I would like to know for how long these transistors will be produced, I have seen they are active, but I have heard rumors that their production will stop.Thank you

This IC i found in my car music system

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#define F_SAMPLE 48000.0f #define F_OUT 4000.0f #define PI 3.14159f   for(uint16_t i = 0; i < sample_N; i++) { sin = sinf(i * 2 * PI * sample_dt); dataI2S[i*2] = sin * 5000; dataI2S[i*2 + 1] =sin * 5000;   } HAL_I2S_Transmit_DMA(&hi2s3, (uint16_t *)dataI2S, sample_N*2);#define F_SAMPLE 48000.0f #define F_OUT 4000.0f #define PI 3.14159f   int a = 1;   for(uint16_t i = 0; i < sample_N; i++) { sin = sinf(i * 2 * PI * sample_dt); if(a%3) { dataI2S[i*2] = sin * 5000; dataI2S[i*2 + 1] =sin * 5000; } else if (a%2) { dataI2S[i*2] = sin * 3000; dataI2S[i*2 + 1] =sin * 3000; } else if (a%1) { dataI2S[i*2] = sin * 7000; dataI2S[i*2 + 1] =sin * 7000; }   a++; } HAL_I2S_Transmit_DMA(&hi2s3, (uint16_t *)dataI2S, sample_N*2);I am using the very above code to send sin wave to audio output and it perfectly creates sound. But I want to randomize the vawe and what I did is above. But it just generates the same s

Is the internal circuit of the terminal damaged if a surge voltage of 3.6V or higher is applied to the INP and INN terminals of the Class-D audio amplifier IC "TDA7498"?Is there an element in the chip to protect against the effects of surge voltage?

Figure 19 in the TS3011 datasheet is a recommended layout for this high-speed comparator. But there is no corresponding schematic diagram to indicate the purposes and values of the components. Where can I find this schematic diagram?

I use the TS922 as a non-inverting amplifier with a supply voltage of 0V / 10.5V. Since the TS922 is not short-circuit proof at the output, I am looking for a suitable circuit for it.

Dear Tech Support,I built up a stand-alone TDA7269A audio amp brd using one of the circuit app's of the data sheet. It worked well - clean, balanced, and the channels are independent of each other. So, I rolled the same design onto an integrated system board with a power supply and and separate signal conditioning for each of the inputs. I now get completely different (bad) behavior responses of the amp. I have verified the circuit design and the PCB layout, tried the 2 single-supply app's noted in the App Notes plus one not listed, and exhausted all the clean-up techniques I can think of.The behaviors I'm getting include:Unbalanced output Significant output signal mixing - change the input on Ch1 and Ch2 responds. I also get increased output when I turn both inputs up like an adding functionGet significant waveform distortionA strange behavior where as I increase the input level on one channel, it causes it cause the output(s) to increase, then fade to zero, then increase again. It's

Hello we have a circuit that is little sensitive, we are trying to read an analog accelerometer, our board is ready, but i noticed while working with LMV324LIPT as follower when the input voltage is higher than 4.5V the output saturates at this value, this probably is due the Common mode input voltage range (VCC-) - 0.2 to (VCC+) - 1, our input goes up to 5V so we need the AO does the whole range rail to rail. So we decided changing for LMV324IPT that has the same footprint , this one does not saturates and basically has the whole range, but I noticed that the gain is not 1, example if the input is 3 the output is 2.9 and so on, is this normal for this device? is not rail to rail device means that will give me the whole range same output than input?

Hello, ​I'm trying to tuning CO​ Gas reading value with the board P-Nucleo-IKA02A1.By the P-Nucleo-IKA02A1 BSP, Get_Gas_concentration function is belows..​float Get_Gas_concentration(float gain, float sens){ return ((float)Get_ADC_value(ANALOG_GAS_VALUE_PIN)-Get_ADC_value(ANALOG_REF_VOLT_VALUE_PIN))*805664/gain/sens; }What's the meaning of the constant, 805664, of above source code?

Hi ST team, I am using the TS332 comparator to do a pulse length protection. It uses a capacitor on an input which charges and discharges in function of the pulse length. At power off, this capacitor remains charged at around 700mV while the device is unpowered. The capacitor then slowly discharges through the input of the comparator.Can it be damaging for the device in the long run? There is no indication of the maximum input current allowable in the datasheet, what could be the absolute maximum input current for these device?Thanks in advance!

Hello.What is the component value of FDA4100LV ?!best regard , hoseyn.

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Hi,Hope this post find you well.My intention is to make an 3-phase power calibrator !Similar to this link, https://us.flukecal.com/products/ele...wer-calibrator My current AMP design might be class AB type.I am not worried to much about PWM generation ruther I am thinking how can I move class AB to Class D amplification.A lot of the design effort relates to maintaining linearity and avoiding crossover distortion.In this case, 2 amplifiers( current, voltage) output will feed to CT and PT!Lets consider transformer load .REQUIRMENTS :1. The amp input should be plus and minus 7volt AC, 45-65Hz( 1 Hz has been converted to 1024)2. Amp operating voltage should be more or less 24v.3. 2 channel signal (not sure PWM) should be use , one for current, one for voltage.4.Can run current transformer(input 16.5 V/1.5 A) and potential Transformer (input15v/2A). PT output may be 15VAC.5. If possible both voltage and current amplification is required in one IC.6. Both positive and negative half signal sh

hy,I would like to use your NUCLEO-F446RE board platform with X-NUCLEO-CCA01M1 and X-NUCLEO-CCA02M1 expansion board, using the FP-AUD-SMARTMIC1 software.In reality we have a configuration like the figure in the annexwhere external codecs are not used but only the adc and dac internal to the micro.Is there anything more suitable? it would seem so, as explained in your AN2812 application with analogue microphones. Are there more nearby boards or demo boards more suitable for using open source firmware as an echo canceller?

We are using "M41T80M6F" and "LM239ADT" in our design.We require power dissipation of this ic under typ,min and max conditions for thermal analysis.Also require "RθJB-Thermal resistance between Junction to Board",RθJC-Thermal resistance between Junction to Case ,RθJA-Thermal resistance between Junction to Ambient and Tjmax-Junction temperature. which is not available in the datasheet.Kindly help us to get the same asap.

We are using "M41T80M6F" and "LM239ADT" in our design.We require power dissipation of this ic under typ,min and max conditions for thermal analysis.Also require "RθJB-Thermal resistance between Junction to Board",RθJC-Thermal resistance between Junction to Case ,RθJA-Thermal resistance between Junction to Ambient and Tjmax-Junction temperature. which is not available in the datasheet.Kindly help us to get the same asap.

hello, Sircustomer inquiry for BTL up to 200W audio Amp.per checked TDA7498E data sheet, it can support mono parallel BTL output up to 220W.May I know how to configuration mono parallel BTL output and any EVKIT available for customer test?Thank you.

I have written code for the STM32F769-Discovery card to read in analogue audio, convolve it with a relatively long FIR, then output the result as analogue audio. My code compiles with no errors, no warnings, but I get no output from the card.  I am happy to email my main.c to someone who can tell me what I have done wrong.My code has been heavily derived from the audio_passthrough project by Francois Beaulier. The unchanged audio_passthrough project works fine.

Hello,I have a question about transistor's connection to the GND (pin nr.:10).To which one (SGND or PGND) E of this transistor is connected?Datasheet: Doc ID 13907 Rev 6, Figure 28.Thank you,Przemek

Hello; I have the electronic circut card including ST microelectronics IC component. 256D is written on the top of componenet , SOIC8 package I coudlnt find any tecnical information on the internet. According to electronic circuit it seems an OPAMP. Would you please help me what kind of IC is 256D?