Another bad and potentially dangerous circuit from Facebook. This is supposed to charge LiIon battery from USB power. Identified problems: – no current limiting – can overcharge the battery – red charging LED will be always on when there is USB power coming in – green charged LED will not turn on when battery is →
https://www.facebook.com/share/r/1MqEUa6oyN/ A bad design that for most control range LEDs are off, then there is some brightness control and then turn a little bit more and you have your LEDs fried. Trying to control LED brightness without series resistor by adjusting voltage going to then is a bad design. The LM317 should have been configured →
I saw this bad circuit posted to Facebook: It at quick glance looks like a FET based solid state relay (SSR) design to control 230V AC. But actually it is not suitable for the application at all. If you connect the circuit like shown, it will not work as planned and many components will be →
Still, Ai is not capable enough to create correct diagrams on its own. I wonder if it is posible to post working circuits to Facebook…… mostly only AI crap seems to be posted Example from https://www.facebook.com/share/p/16vJCdn37B/ The left side circuit is almost correct, but for example the control button has only one wire in it, →
I saw the following circuit design posted to Facebook. Source: https://www.facebook.com/share/p/1HuYVvXHcf/ What is wrong with this design: No isolation from mains, potentially electrocutes if you touch any part of exposed LED strip. The circuit will only give around 220V/30000ohms=0.00766.. mA current that can light one normal LED but not any long LED strip like shown →
Find 5 errors, missing details, dangers or warning on this circuit from https://www.facebook.com/share/p/18e7rDBUPh/ →
I saw this at Facebook at https://www.facebook.com/share/p/1YitRKKmxy/ Can burn loudspeaker and transformer due DC flowing Dc quite probably saturates transformer core-> lots of distortion and very little sound Even if works the transformer is expensive and limits sound quality Very low impedance sound input is less than 30 ohms – which means this circuit does →
I saw this circuit at https://www.facebook.com/share/p/16HFEwzkcQ/ The diodes try to charge and discharge the mosfet gate based on static electricity of user touching. Depending on the amount of charge you happen have it might not work at all, might work or could fry the mosfet (they are static sensitive components). FETs are extremely vulnerable to →
In the ever-dynamic and fast-moving world of semiconductors, why do some old transistors like 2N3904 and BC547 keep on going for decades? The 2N3904 and BC 547 transistor is still available as a newly manufactured device after 60 years of their introduction. The construction of the 2N3904 and 2N3906 in the mid.1960s represented a significant →
This is a telephone line over voltage protector. This is basen on a design I did originally around 1995. Has been available for almost 30 years. That white thing is a deal gas discharge tube over-voltage protector that dissipates most of the over-voltage surge. It is followed with two other layers of protection (VDR and →