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Type: Posts; User: doncarlosalbatros

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1. ## Thread: Questions about a circuit interfacing a DC fan via open drain way

by doncarlosalbatros
Replies
7
Views
470

### Closed: Re: Questions about a circuit interfacing a DC fan via open drain way

For -10 to +10 diodes will clamp from -0.5V to 5.6V which is dangerous for the micro. Opmap clamps between exactly zero and exactly 5V.
So only diode solution is not fine to me. You can simulate and...
2. ## Thread: Questions about a circuit interfacing a DC fan via open drain way

by doncarlosalbatros
Replies
7
Views
470

### Closed: Re: Questions about a circuit interfacing a DC fan via open drain way

Opamp clamps the possible x>10V input to 5V. Analog input of the Nano should not exceed 5.5V. The diodes are for reverse polarity protection.
I can also use Zener but they are not stable for the...
3. ## Thread: Questions about a circuit interfacing a DC fan via open drain way

by doncarlosalbatros
Replies
7
Views
470

### Closed: Questions about a circuit interfacing a DC fan via open drain way

I have a small project for part of an experiment where a speed will be controlled by a -10/+10V function generator's analog DC output. So basically the chain will be:

Analog voltage(0..5V)------>...
4. ## Thread: How to prevent floating input for this on-off control circuit driving an SSR?

by doncarlosalbatros
Replies
7
Views
520

### Closed: Re: How to prevent floating input for this on-off control circuit driving an SSR?

Hi,

You wrote "A good transducer output should be push-pull. It can handle currents in both directions." I really never heard of it. Interesting. I thought a transducer can/should only output ...
5. ## Thread: How to prevent floating input for this on-off control circuit driving an SSR?

by doncarlosalbatros
Replies
7
Views
520

### Closed: Re: How to prevent floating input for this on-off control circuit driving an SSR?

Hello and thanks for the answer,

For practical reasons I will use separate power supplies, 24VDC for transducer and 12VDC for the comparator circuit.

I want to go through your suggestions and...
6. ## Thread: How to prevent floating input for this on-off control circuit driving an SSR?

by doncarlosalbatros
Replies
7
Views
520

### Closed: Re: How to prevent floating input for this on-off control circuit driving an SSR?

I think you misunderstand what I'm asking.

My worry is if the temperature input is unplugged the heater will be on forever.
So I need the comparator's inverting input to go high(which turns off...
7. ## Thread: How to prevent floating input for this on-off control circuit driving an SSR?

by doncarlosalbatros
Replies
7
Views
520

### Closed: How to prevent floating input for this on-off control circuit driving an SSR?

I was doing on-off temperature control for around 40‎°C for an enclosed big enclosure manually by switching on and off a 1100W heater(with a fan) with my hand. The accuracy is not very important...
8. ## Thread: VFD power input causing RCD to trip

by doncarlosalbatros
Replies
3
Views
364

### Closed: Re: VFD power input causing RCD to trip

Thanks for all of you nice replies.
9. ## Thread: VFD power input causing RCD to trip

by doncarlosalbatros
Replies
3
Views
364

### Closed: VFD power input causing RCD to trip

This VFD drive ACS550-01-012 which was used before has its inputs is wired as L1 L2 L3 and PE as in following diagram without any motor installed causing an RCD to trip the moment I turn on the 3...
10. ## Thread: Cascading amplifier with a line driver for an analog signal transmission

by doncarlosalbatros
Replies
2
Views
327

### Closed: Cascading amplifier with a line driver for an analog signal transmission

Hello,

I'm planning to implement the circuit below I have drawn. But because there is no SPICE for such components I couldn't verify or test any overall workings.

151256
(left-click to...
11. ## Thread: Need help with fully differential amplifier

by doncarlosalbatros
Replies
5
Views
726

### Closed: Re: Need help with fully differential amplifier

Hello,

What is "a -1 amplifier" ?
12. ## Thread: Need help with fully differential amplifier

by doncarlosalbatros
Replies
5
Views
726

### Closed: Need help with fully differential amplifier

Hello,

I have a uni polar balanced/differential output transducer where wiring can be seen at page 41 of this manual.

The transducer outputs around +/-200mV and I want to amplify this with a...
13. ## Thread: How to make a better design for this SMPS post regulator filter circuit?

by doncarlosalbatros
Replies
21
Views
1,182

### Closed: Re: How to make a better design for this SMPS post regulator filter circuit?

Dear all,

Here is my final version:

151143

I also attached a rar file where I put the asc file for you to run if you use LTspice.

These mortification came after I read this document.

by doncarlosalbatros
Replies
17
Views
1,033

### Closed: Re: Quick way for an adjustable low pass filter with roll-off frequency display

Yes it is changing and the instrumentation also changing. I want to build for test purpose. I also added a diagram in my new post below.

- - - Updated - - -

Hello all,

Here is my final...

by doncarlosalbatros
Replies
17
Views
1,033

### Closed: Re: Quick way for an adjustable low pass filter

I think the previous answer also mentioned that. Do you mean the following types of filters?:

https://www.analog.com/media/en/technical-documentation/data-sheets/10641fa.pdf
...

by doncarlosalbatros
Replies
17
Views
1,033

### Closed: Re: Quick way for an adjustable low pass filter

Hello,

This is interesting to try.

But in the document I couldn't find the minimum and maximum ratings for the input voltage and the clock frequency hence the roll of freq.

by doncarlosalbatros
Replies
17
Views
1,033

### Closed: Quick way for an adjustable low pass filter with roll-off frequency display

Hello,

I want to build an adjustable low-pass filter for 0 to 10 kHz range as general purpose but especially to be used as an anti-aliasing filter.
One should be able to adjust the cut-off...
18. ## Thread: How to make a better design for this SMPS post regulator filter circuit?

by doncarlosalbatros
Replies
21
Views
1,182

### Closed: Re: How to make a better design for this SMPS post regulator filter circuit?

Hello all,

I came across this document https://www.maximintegrated.com/en/app-notes/index.mvp/id/883

The third option in document cascading two regulators. But I also saw designs using common...
19. ## Thread: How to make a better design for this SMPS post regulator filter circuit?

by doncarlosalbatros
Replies
21
Views
1,182

### Closed: Re: How to make a better design for this SMPS post regulator filter circuit?

This one shows for 15V model 1.34A. I also deal with ones between 500mA to 1A.
20. ## Thread: How to make a better design for this SMPS post regulator filter circuit?

by doncarlosalbatros
Replies
21
Views
1,182

### Closed: Re: How to make a better design for this SMPS post regulator filter circuit?

Here is an example of SMPS datasheet I use(they dont write about Zout explicitly). Here is the datasheet of it https://docs-emea.rs-online.com/webdocs/1292/0900766b8129224d.pdf 15V model.

Maybe...
21. ## Thread: How to make a better design for this SMPS post regulator filter circuit?

by doncarlosalbatros
Replies
21
Views
1,182

### Closed: Re: How to make a better design for this SMPS post regulator filter circuit?

Hi,
It is just the worst case for the current for low frequency. Maybe it is not realistic.?
It could be a 50Hz noise I thought.

Please let me know if you think I need to change anything for...
22. ## Thread: How to make a better design for this SMPS post regulator filter circuit?

by doncarlosalbatros
Replies
21
Views
1,182

### Closed: Re: How to make a better design for this SMPS post regulator filter circuit?

Can you give me a realistic estimate for Zout? Is 20mOhm too big or too low?
Is it in order of Ohms or milliohms? What could it be for min to max roughly?
23. ## Thread: How to make a better design for this SMPS post regulator filter circuit?

by doncarlosalbatros
Replies
21
Views
1,182

### Closed: Re: How to make a better design for this SMPS post regulator filter circuit?

Do you mean 1V is too much and non realistic? What value would be a good estimate?

Do you also have any other recommendation for this circuit or component values? Do I need parallel caps for C2 to...
24. ## Thread: How to make a better design for this SMPS post regulator filter circuit?

by doncarlosalbatros
Replies
21
Views
1,182

### Closed: How to make a better design for this SMPS post regulator filter circuit?

For minimizing SMPS ripple and especially noise, I’m trying to make a small interface which is a post regulator cascaded after an LC filter. I have come across some papers related to this topic and...
25. ## Thread: Does this term mean AC coupled output?

by doncarlosalbatros
Replies
1
Views
386

### Closed: Does this term mean AC coupled output?

Regarding this single to diff ended converter module, it is written "Output:Transformer Balanced".

Does that mean it is AC coupled and will not output DC input? What will it output for a constant...
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