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Ok thanks. Its obvious now, regarding the specs. For some reason I didn't factor in the temp stuff.
The output is connected to a 4000 series schmitt at 12V power even 2V gives margin.
I'm still confused as it feels the wrong way round to me.
CTRmin 53% for Vo = 0.5V
CTRmin 93% for Vo = 0.4V
Surely this is the opposite of what you mention?
My Vout max is about 2V (2mA) and I was looking to select a resistor to limit I/F.
I dare say I can put loads of margin on so not...
I have designed in lots of OPTOs in the past and an looking to use the ACPL-K54L. I'm now confused about one of the specifications on the datasheet of this particular part.
https://www.mouser.co.uk/datasheet/2/678/AV02_2223EN_DS_ACPL_x5xL_2021_01_27-1828103.pdf
Top of page 10: CTR. So if I...
The part is the RL21 here:
https://www.spselectronic.com/fileadmin/user_upload/relais/datenblaetter/Data_sheet_RL_42-l_RL_42_RL_21.pdf
I queried by email and they stated that the pickup voltage is 24V-10% minimum and that there is no seperate dropup voltage.
Klaus - The voltage used for the...
I'm aware that relays generally have a large amount of Hysteresis. I am currently using quite a large model for High Voltage/Power.
The pickup voltage is 24V +/- 10% but the manufacturer does not gauratee dropout voltage.
I've measure it on one sample (about 1V). I want to save power (and...
In the past I have used a 431 (shunt ref/reg) to detect over-voltage (or sometimes under-voltage) conditions on a HV rail. I would normally have a LV rail in addition that has circuitry to "action" the overvoltage condition.
In the absence of a negative equivalent of the 431 the circuit becomes...
Given a curve of on voltage V current like figure 7 here...
/docs.rs-online.com/1716/0900766b814f6634.pdf
Is there a way of reasonably accurately extending this data beyond the curve to give say in this example the volt drop for a 1kA pulse. I didn't know if there is an underlaying relationship...
Hi,
That worked ok (I thought I had already tried that to be honest, but most have done something wrongly).
One thing is that if I make this variable "volatile", I get a warning everywhere its used in the ISR (stating that the volatile qualifier is discarded). It appears to work ok without...
You might be right in some respects; however, my input is from someone typing in a terminal and I need to react to every character.
I did it by interrupt as I thought there would be less chance of missing characters than polling.
I simply want to get around having to refer to inData[0] whilst...
Im using a STM32 with Cube IDE.
Im using the HAL UART libaries and using the function HAL_UART_Receive_IT which has decleration:
HAL_StatusTypeDef HAL_UART_Receive_IT(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size)
I am calling this fuction using:
HAL_UART_Receive_IT(&huart2...
In C, what's the best way write a generalized function to get various strings into a circular character array buffer?
Is there a better (more efficient) way that looping one byte at a time, bearing in mind that we (may) have to deal with buffer wrap around halfway though the string.
Is there a way in C to move individual binary bits from one int to another. I.E. say bit 3 of int a to bit 7 of int b etc.
It would be handy for mapping enable bits to various pins on a specific port on a micro.
Forced sharing using resistors seems a bit troublesome due to the very high currents.
Currently thinking of using 6 diodes in parallel to make one 3kA rated (ish) part - about 500A per device.
Above about 200A the parts in question cross over to the positive temp coefficient so that will help...
I have an application that has really high currents through diodes for say 100-200us a few times each second.
Diodes such as these.... https://www.vishay.com/docs/96475/vs-65eps16lhm3.pdf
.... specify surge ratings as non-repetitive.
Is there a generally accepted derating for repetitive...
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