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Hi, I am designing an industrial control board. I am optoisolating everything that goes to the outside world (field) which means I need isolated power/gnd as well. I have a 5V switching regulator (3 amp) that powers my board which is more than enough current (this is the power for the...
Anyone know the best most effective way to filter out contactor noise and AC motor noise on board? The noise is coming in through at least 2 ways: 1) through the step-down transformer that powers the circuit and 2) through the relays driving the AC motors, etc.
I am powering 240V contactors...
Thanks, Golden Electronics. So just shortening the cable length to your LCD fixed your problem?
I know I need some type of filtering on board since large inductive loads are on the same power lines that feed the power supply of my board. I just don't know what the best method is. I can't...
The chassis of the 208V transformer is tied to earth gnd.
Yes, that is 24Vac coming in. OK, so that's why the caps fried...electrolytic (thank you!). Well, I removed them after they fried, so the circuit that I have been testing only has the inductor (L4), common-mode choke, rectifier, and...
Hi, I am using a microcontroller to drive some relays that drive contactors. My board is powered by the 208Vac through transformer then through bridge then to LM2596 simple switcher which gives a 5.0V output. Then that 5.0V is sent through a LM3940 to generate 3.3V output needed for other...
I am trying to use the ADS1241 ADC with differential inputs. I attached 2 circuits (one is for a voltage input and another is for a current input).
I am a little confused on the input voltage range of the ADS1241. Datasheet pg. 3 says Analog Input Range (Max=AVdd+0.1 and Min=AGnd-0.1) but...
I used an LM317 to generate a +24VDC supply for the DAC (needs 10.8V to 40V supply). I also have an ADC that needs an AVdd of 5V. My 5VDC supply is generated by an LM2596 simple switcher from 24VAC(rms) (34VDC after rectified), so it has some 150KHz noise on the line. I plan on using the 5VDC...
Hi, I am trying to use the AD5412 (DAC). It requires an analog supply voltage AVdd of between 10.8V and 40V. I was thinking about using a step-up boost regulator such as LT1316 to generate a 12V DC output to supply the AVdd pin with on the AD5412. I am worried about the noise though since it...
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