Direction of diodes in an amplifier

Direction in #1 is a mistake, that can't work.

Lack of understanding? Pretty basic stuff.

The catch is they actually did connect the diodes in the circuit the correct way (if it works).
Maybe somebody else made the schematic, and the guy didn't look at it too closely.

Dyslexic?

adason said:

I thought so.
Why do they have it on their web page and youtube videos?
Thanks.

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Because they get many thousands likes, million views, exaggerated praise, etc.
You are scratching the bottom of the barrel as far as Electronics videos go, and that compared to a very poor average.

DIY Powerful Ultra Bass Amplifier Z44N MosFet, No IC, Simple circuit - YouTube

HOA KỲ
DIY Powerful Ultra Bass Amplifier Z44N MosFet, No IC, Simple circuit
1,450,374 views
Mar 18, 2021
20K

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adason said:

Can anyone explain why the direction of d1 and d2 diodes is opposite in these simple circuits? Thanks.

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Even with the diodes in the right direction the low-sideoutput pnp will never see any base current.

No stabilisation of output bias voltage at all.
The hole schematics is a pile of crap

What about this one? Is direction of D3 correct or not? ;-)

adason said:

JMFahey, I like it!
Fully understand that these people are trying to have as many hits on yt to earn some money.
Still, the link to webpage i posted looks like more serious stuff.

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The link you posted actually comes up with a fraud warning when trying to enter

Accessing this site is a waste of time. Like so many others...

adason said:

Can anyone explain why the direction of d1 and d2 diodes is opposite in these simple circuits? Thanks.

Click to expand...

If we look at the site Pictured Version then we also see that the Emitter of 2SC2383 is connected to Collector of 2SC1943, so this give already another circuit..
Also read the Text.. Blue highlighted in the screenshot
Also in this picture below we can see the diodes are connected the correct way, mistake or bummer one or the other..

One of the both isn't accurate or possible both..
The Circuit will run when diodes are connected the visa versa./.
Have run it in my Simulation program.

adason said:

At first i had no issue accessing the page, now it gives me warning too. You can access it on your own risk. Or run your browser in secure mode.

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It's just an expired security certificate! Browser tells me that Security Certificate has expired on day ago..
if you have a good firewall and Anti Spy - Spam then nothing to worry about..

franzm said:

Is direction of D3 correct or not? ;-)

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Yes, D3 is at the base of PNP transistor TR4.