DIY Buck Converter 

How did it go?

It shouldn't. The voltage drop across it is pretty low, most of the drop is across the load. If you short the load....yeah I think so.

Microfarad...

dwpetty3723 nothing here was warmer than room temperature

dwpetty3723 that's the thing about switching power supplies.... Because the current is just interrupted to reduce voltage instead of drawn off by a resistor like a voltage bridge, they are very efficient. Nothing is wasted to reduce the voltage, but the drawback is they are more noisy. So devices may still use both a buck converter for most of the voltage reduction and then a linear regulator (like a LDO) which will waste a little bit of power but ensure less noise and more even voltage under load.

Mosfets Gates must be driven by a voltage around 10-20v, 12v is a safe voltage, 22v is too much and probably would damage the mosfet gate

​@@VictorC173 the mosfet is being used in the high side so it needs bootstrapping to fully turn on

Inductor size is extremely important! In fact, the value of every component , the switching frequency, the input and output voltage, and the loading are all extremely important to proper operation. You generally can't expect to throw together parts and expect it to work.

Why would it not be important?

+Adeyemi Oladayo preset? I don't know what you mean?

@@learnelectronics he meant a varistor/pot

+Jason Burt haha thanks

A 7805 would generate a lot of heat via a heat sink if the desired voltage was 5v. They are inefficient for this spread.

Everywhere you need a power source of lower voltage than your other (available) power supply puts out...As an example, I have a 24V psu, but I need a 5V one. This is easy to implement by a buck converter.

Ne555

as i know, ic555 can't create duty cycle < 50% so could you explain for me why the output voltage can go down to 5V?

@@nguyeninhkhanh9020 it can go below 50%, he has wired the timer to increase the discharge compared to the charge rate. Clever setup really :)

fredlllll maybe, I was thinking a SEPIC😀

looking forward to it

There's no rectifier, so..

don g no, no Patreon. I appreciate you wanting to support the channel though. that means a lot.

exactly. And not practical for a buck. A lot of switching losses.

Hicham Bougaa a buck converter decreases voltage and increases amperage. so the maximum current would be a function of input versus output. but if you want to talk about maximum current by component, the 1N4007 diode has the lowest rating at 3A.

The circuit diagram is so simple we don't need that but you can find that on google 'buck converter using 555'.

He doesn't include the charge pump to drive n channel gate