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See wikipedia for the voltage levels of RS232 and you will understand the problem. RS-232 - Wikipedia, the free encyclopediaHowever, it IS possible to connect a single supply circuit without a proper level shifter. If you only transfer data from PC to circuit, it is easy as you don't have t...
I use a 1 GBit serial flash. Very simple to attach through the SPI bus. You need to make a driver though and that can be a little bit tricky. If you can not find such a memory (mine is a BGA, you maybe do not want that), there are lots of parallell flash that you can use. If you are a hobby...
Everything will depend on your circuit design. A circuit board with GND plane or just a bunch of cables? Split power supplies?
- Make sure that the cables that feeds power are not also used for signals.
- Add LC filter to the motor/motor controller
- Reduce the switching speed.
What you are totally missing is the difference of UART and RS232. The signal levels are not the same so therefore you need a converter between these signals. See the schematic from lockman_akim and you will see such a chip. There are of course a lot of different circuits but is is not important...
Of course it works, it's a standard way to do it. Just be sure that the micro can drive enough current. It will of course not work in a 3V system as you are using a blue LED. Actually today with many very low power circuits and low impedance MCU i/O you can use I/O to power all kinds of stuff...
Finally I answer my own question. Copper cables do generate noise. The wires will induce an inductive current just because of the movement though the earth magnetic field and this small current can be a problem for very high sensitive sensors. Therefore there are non magnetic cables that is used...
Hi.
I know that this is a really long shot but you never know.
I'm trying to repair a lithium battery protection and/or balancing board. On this, compared to others similar I have seen, really heavy mounted board, there are two chips I can't recognize. It is one 5 pin SC-74A and one 6 pin...
Signal filter L or R
I am about to design in a filter on the RS232 signal lines from a Bluetooth module and other circuit. The purpose is to avoid the noise from the module. The RS232 is communicating in 230 kbit. It is a space critical application so the components must be small, 0402 or 0603...
The meaning of fan-out is usually the minimum distance from the pad to the via. The reason to have a fan-out and not put the via in direct connection to the pad is that you want to have solder mask isolation between the pad and the via to avoid the via steeling solder from the pad during the...
snubbers
For a lossless snubber I recomend to use a triac that does not need a snubber if you rapplication accept it. I do not remember any example triac though but I can check if you like.
ecg cables canada
That was fun. Do you know anything about measuring ECG? If you for example use an ordinary non-inverting OP-amp circuit and amplifies the ~500 times to get the ECG signal, you will have a 1000% saturated output because of that the power noise is so very much higher than your...
ecg noise
Hi.
Recently I noticed that the type of cable have great significance to the 50 (60) Hz noise in my ECG amplifier. And by type I do not mean if it is screened, twisted and such things but the wire type. I fI use a soft silicone cable with large copper area and get much higher noise...
remove dc from signal
The DC level is from 0V to 3V. The frequency depends on the sampling rate and can be from minimum 100 Hz to 10 kHz. The sampling rate is however tuned for a specific application and can be fixed somethere in this interval. The system will be designed for a maximum sampling...
remove the dc level
I need to remove the DC offset of a signal that consist of small pulses as a result of sampling. The problem is that the circuit must be very accurate as the resulting signal shall be amplified several undered of times afterwards and that the circuit must be very small as...
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