# Search:

Type: Posts; User: Blue10

1. ## Thread: NE555 astable frquency

by Blue10
Replies
10
Views
375

### Closed: Re: NE555 astable frquency

But by using your equation the frequency will be : 9 * 10^(-5) Hz !!
2. ## Thread: NE555 astable frquency

by Blue10
Replies
10
Views
375

### Closed: Re: NE555 astable frquency

So the frequency is : f = 1.44 / ((R1 + 2*R2)*c) = 13KHz ?
3. ## Thread: NE555 astable frquency

by Blue10
Replies
10
Views
375

### Closed: Re: NE555 astable frquency

Why is R2=5k?
4. ## Thread: NE555 astable frquency

by Blue10
Replies
10
Views
375

### Closed: NE555 astable frquency

Hi,
How do I calculate the frequency of this circuit?
153952

Thanks.
5. ## Thread: 24V to 5V Buck converter

by Blue10
Replies
33
Views
1,666

### Closed: Re: 24V to 5V Buck converter

The input voltage is fixed at 24V
Output voltage : from 5V to 24V
Imax > 200mA
Frequency : 20kHz
Duty cycle : 0% to 100% (not necessarily)

Please suggest MOSFET to be used as a switch.
Note...
6. ## Thread: 24V to 5V Buck converter

by Blue10
Replies
33
Views
1,666

### Closed: Re: 24V to 5V Buck converter

That was corrected by using another of mosfet (2N7002 instead of IRF54), now I should design the control loop, any suggestions are welcome.

I have another question : How to calculate the...
7. ## Thread: Are DC to DC converters a type of SMPS?

by Blue10
Replies
5
Views
368

### Closed: Re: Are DC to DC converters a type of SMPS?

The wikipedia article says that buck, boost, buck boost... are SMPS but a doctor at my university once told me that they are just DC-DC converters not SMPS, that's why I am asking.

by Blue10
Replies
33
Views
1,666

153474

Thank you.
9. ## Thread: Are DC to DC converters a type of SMPS?

by Blue10
Replies
5
Views
368

### Closed: Are DC to DC converters a type of SMPS?

Hi,
Does DC-DC converters like buck, boost, buck boost... belong to switched-mode power supply?

Any replies from you are really appreciated!
Sincerely,
10. ## Thread: 24V to 5V Buck converter

by Blue10
Replies
33
Views
1,666

### Closed: Re: 24V to 5V Buck converter

After simulating the circuit using the values you provided, i got the same previous result (Higher output voltage).

153466

Have a nice day.
11. ## Thread: 24V to 5V Buck converter

by Blue10
Replies
33
Views
1,666

### Closed: Re: 24V to 5V Buck converter

I want to make a discontinuous conduction mode (DCM).
12. ## Thread: 24V to 5V Buck converter

by Blue10
Replies
33
Views
1,666

### Closed: Re: 24V to 5V Buck converter

It is a white LED so the Vf must be between 3.3V and 5V.
13. ## Thread: 24V to 5V Buck converter

by Blue10
Replies
33
Views
1,666

### Closed: Re: 24V to 5V Buck converter

No, I want at least 20mA to turn a LED on.
14. ## Thread: 24V to 5V Buck converter

by Blue10
Replies
33
Views
1,666

### Closed: Re: 24V to 5V Buck converter

Here is the modified circuit:
153455

The same problem persist.

The multivibrator is 2.2kHz and the duty cycle is 30%.
15. ## Thread: 24V to 5V Buck converter

by Blue10
Replies
33
Views
1,666

### Closed: Re: 24V to 5V Buck converter

The switching frequency is 20kHz.
16. ## Thread: 24V to 5V Buck converter

by Blue10
Replies
33
Views
1,666

### Closed: Re: 24V to 5V Buck converter

Because that answer doesn't solve my probleme.

by Blue10
Replies
33
Views
1,666

Yes I did.
18. ## Thread: 24V to 5V Buck converter

by Blue10
Replies
33
Views
1,666

### Closed: Re: 24V to 5V Buck converter

What could be the reason for the high output voltage?
19. ## Thread: 24V to 5V Buck converter

by Blue10
Replies
33
Views
1,666

### Closed: Re: 24V to 5V Buck converter

Thank you for your fast response.
The circuit still doesn't work even after applying higher voltage.
20. ## Thread: 24V to 5V Buck converter

by Blue10
Replies
33
Views
1,666

### Closed: Re: 24V to 5V Buck converter

The gate driver voltage is 10V.

How to do that?
21. ## Thread: 24V to 5V Buck converter

by Blue10
Replies
33
Views
1,666

### Closed: 24V to 5V Buck converter

Hi,
I want to design a simple buck converter that convert a 24V input to a 5V output.
I made a schematic but it doesn't work, it gives a higher output voltage (even when I reduce the duty cycle to...

by Blue10
Replies
5
Views
538

### Closed: Re: [SMPS]Flyback converter

Could you explain with more details the functioning of the transformer?
Have a nice day.

by Blue10
Replies
5
Views
538

### Closed: [SMPS]Flyback converter

Good morning,
Could anyone please clarify for me how this flyback circuit work?
You'll find attached the circuit and the properties of the transformer TR1.
153440153441

P.S: this circuit...
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