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What is the length of your Lanczos filter?well this is quite embarassing
iirc i set "wing" length as small as possible due to some complication i encountered earlier, extra ringing? iirc... length only like 2 or 3 
i dont have indepth knowledge about it and its effect. thanks for your info, i'll looking into it deeper later...
. Still, it eventually came off OK. I replaced it with a new part, and replaced R4 with a series combination of 100Ω and a BZX84C3V3 zener, which I happened to have in stock. Gradually winding up the supply voltage showed the Vdd supply still reached 18V with only 218VAC at the input - clearly the zener was not dropping enough volts at the very low operating current.
Get out your red-blue anaglyphs, and see the footballIt worked! 👍
But what do you want to find? As I understand, the noisier the tube amp is - the better. Or not? If you don't want noise at all - use metalfilm resistors.
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/*
*/
/*
*@Note
*Multiprocessor communication mode routine:
*Master:USART1_Tx(PD5)\USART1_Rx(PD6).
*This routine demonstrates that USART1 receives the data sent by CH341 and inverts
*it and sends it (baud rate 115200).
*
*Hardware connection:PD5 -- Rx
* PD6 -- Tx
*
*/
#include "debug.h"
#include <ch32v00x_i2c.h>
#include <ch32v00x_rcc.h>
/* Global define */
/* Global Variable */
vu8 val;
/*********************************************************************
* @fn USARTx_CFG
*
* @brief Initializes the USART2 & USART3 peripheral.
*
* @return none
*/
void USARTx_CFG(void)
{
GPIO_InitTypeDef GPIO_InitStructure = {0};
USART_InitTypeDef USART_InitStructure = {0};
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD | RCC_APB2Periph_USART1, ENABLE);
/* USART1 TX-->D.5 RX-->D.6 */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOD, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOD, &GPIO_InitStructure);
USART_InitStructure.USART_BaudRate = 115200;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
USART_Init(USART1, &USART_InitStructure);
USART_Cmd(USART1, ENABLE);
}
//
/*
*@Note
7-bit addressing mode, master/slave mode, transceiver routine:
I2C1_SCL(PC2)\I2C1_SDA(PC1).
This routine demonstrates that Master sends and Slave receives.
Note: The two boards download the Master and Slave programs respectively,
and power on at the same time.
Hardware connection:
PC2 -- PC2
PC1 -- PC1
*/
#include "debug.h"
/* I2C Mode Definition */
#define HOST_MODE 0
#define SLAVE_MODE 1
/* I2C Communication Mode Selection */
#define I2C_MODE HOST_MODE
//#define I2C_MODE SLAVE_MODE
/* Global define */
#define Size 6
#define RXAdderss 0x02
#define TxAdderss 0x02
/* Global Variable */
u8 TxData[Size] = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06 };
u8 RxData[5][Size];
/*********************************************************************
* @fn IIC_Init
* @brief Initializes the IIC peripheral.
* @return none
*/
void IIC_Init(u32 bound, u16 address)
{
GPIO_InitTypeDef GPIO_InitStructure = {0};
I2C_InitTypeDef I2C_InitTSturcture = {0};
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO, ENABLE );
RCC_APB1PeriphClockCmd( RCC_APB1Periph_I2C1, ENABLE );
/// SDA : ///
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init( GPIOC, &GPIO_InitStructure );
/// SCL : ///
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init( GPIOC, &GPIO_InitStructure );
I2C_InitTSturcture.I2C_Mode = I2C_Mode_I2C;
I2C_InitTSturcture.I2C_OwnAddress1 = address;
I2C_InitTSturcture.I2C_ClockSpeed = bound;
I2C_InitTSturcture.I2C_DutyCycle = I2C_DutyCycle_16_9;
I2C_InitTSturcture.I2C_Ack = I2C_Ack_Enable;
I2C_InitTSturcture.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_Init( I2C1, &I2C_InitTSturcture );
I2C_Cmd( I2C1, ENABLE );
// #if (I2C_MODE == HOST_MODE)
I2C_AcknowledgeConfig( I2C1, ENABLE );
// #endif
}
//
/*********************************************************************
* @fn main
* @brief Main program.
* @return none
*/
int main(void)
{
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
SystemCoreClockUpdate();
Delay_Init();
USART_Printf_Init(115200);
printf("\r\n\r\n: I2C_MPU6050_003_2 : \r\n");
printf(" SystemClk:%d\r\n",SystemCoreClock);
printf( "ChipID:%08x\r\n", DBGMCU_GetCHIPID() );
USARTx_CFG();
//
// u8 i = 0;
u8 j = 0;
// u8 p = 0;
u8 res ;
// __IO uint32_t i2creg=0 ;
__IO uint32_t i2cxbase=0 , i2cxbase1=0 , i2cxbase2=0 ;
i2cxbase = (uint32_t)I2C1 ; // = (uint32_t)I2Cx;
// i2creg = I2C_FLAG >> 28;
// I2C_FLAG &= FLAG_Mask;
// if(i2creg != 0)
// {
// i2cxbase += 0x18;
i2cxbase1 = i2cxbase + 0x14;
// }
// else
// {
// I2C_FLAG = (uint32_t)(I2C_FLAG >> 16);
// i2cxbase += 0x18;
i2cxbase2 = i2cxbase + 0x18;
// }
printf("> main(): IIC mode\r\n");
IIC_Init( 80000, TxAdderss);
while( 1 )
{
printf("= main(): for(0..5) \r\n");
for( j=0x01; j <= 0x7F ; j++ )
{
while( I2C_GetFlagStatus( I2C1, I2C_FLAG_BUSY ) != RESET );
printf("= main(): ->I2C:Start() \r\n");
I2C_GenerateSTART( I2C1, ENABLE );
while( ! I2C_CheckEvent( I2C1, I2C_EVENT_MASTER_MODE_SELECT ) ) {}
printf(" = main(): ->I2C:SendAdrId() = x%02X \r\n" , j );
// I2C_Send7bitAddress( I2C1, 0x02, I2C_Direction_Transmitter );
// I2C_Send7bitAddress( I2C1, 0x68, I2C_Direction_Transmitter );
I2C_Send7bitAddress( I2C1, j, I2C_Direction_Transmitter );
// while( ! I2C_CheckEvent( I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED ) ) {}
res = I2C_CheckEvent( I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED ) ;
printf(" => MTM=%d " , res );
res = I2C_CheckEvent( I2C1, I2C_Direction_Transmitter ) ;
printf(", DirT=%d " , res );
Delay_Ms(1);
res = I2C_CheckEvent( I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED ) ;
printf(", MTM=%d " , res );
// res = I2C_GetFlagStatus( I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED ) ;
res = (*(__IO uint32_t *) i2cxbase1);
printf(", St=%d " , res );
res = (*(__IO uint32_t *) i2cxbase2);
printf("%d " , res );
/*
while( I2C_GetFlagStatus( I2C1, I2C_FLAG_TXE ) == RESET ) {}
I2C_SendData( I2C1, TxData[i] );
while( ! I2C_CheckEvent( I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED ) ) {}
*/
printf("\r\n= main(): ->I2C:Stop() \r\n");
I2C_GenerateSTOP( I2C1, ENABLE );
// res = I2C_GetFlagStatus( I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED ) ;
res = (*(__IO uint32_t *) i2cxbase1);
printf(" , St=%d " , res );
res = (*(__IO uint32_t *) i2cxbase2);
printf("%d \r\n" , res );
Delay_Ms(100);
}
printf("\r\n---\r\n\r\n");
Delay_Ms(1000);
} // - while(1) .
//
while( 1 )
{
;
}
//
}
///
All 4 channels on.this is what i meant... perfect sine reconstruction.. i tuned my sim files to this setup, 220MHz sampled at 500MSps (f = Sr / 2.27), here is what i come up with. so it seems Rigol and VisaDSO got broken implementation.