3v to 12v boost converter

309

07:12:57

Third attempt. Added feedback loop for better efficiency per "Dave Tweed" on stack exchange: https://electronics.stackexchange.com/a/453315/227812

published 4 years ago

lenzrulz

4 years ago

Very good for a first attempt...👍

prinzrainer

4 years ago

Don't listen to lenzrulz he makes nonsensical comments. You need to switch your transistor on and off in order for it to work, the idea is to magnetize the inductor and then release that energy to the output capacitor.

ManuelPeh

4 years ago

@prinzrainer: Your comment is more useless than lenzrulz one. At least he wrote somdthing motivating. What you wrote is crap. Koga73 must have known about the way his circuit works, because the circuit works. The main reason for you to post was to write something against lenzrulz. Instead of answering the simple question the author asked for. @koga73: For this purpose I suggest to use any small signal transistors like BC547 (NPN) and BC557 (PNP). Or BC550 and BC560. Also 2N3904 (NPN) and 2N3906 (PNP) should work fine.

kiani

4 years ago

High disipation is only one problem, 1.5 v to provide 300mA pulses.

wyoelk

4 years ago

Sorry koga73, you ask "What transistors do I need (using the PNP and NPN defaults)?" No Lenzrulz isn't known for answering questions. Yes my web research says that any small signal transistors will work. But there is something else askew I just can't quite figure it out yet.

ManuelPeh

4 years ago

To make sure that the transistors will not be harmed by to much current, you also can use BC337 (NPN) and BC327 (PNP). They can handle up to 800mA.

kiani

4 years ago

The npn is not saturating, there seems to be 1 volts across it,, 300mA 1 v. = 300mW.. Just need watching out.

koga73

4 years ago

Ok I got it working for real but it doesn't seem to have enough current. When I plug in a single LED the voltage drops from 20v to 2v. Need help

lenzrulz

4 years ago

@wyoelk, love your snide remark all neatly tucked away...I answer your loadrd questions after you've done your "post & dash" routine...just saying!

lenzrulz

4 years ago

@ManuelPeh, thank you for your comment, much appreciated...👍🏻

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