Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
Hello EDA Board,
Working on learning more about transistors and their operation and how to troubleshoot and check transistors.
Went back into notes and found
Tried searching for this circuit at the Engineer's Garage web site which has a link to this forum:
https://www.engineersgarage.com
But...
Hello KlausST and the EDA board forum,
Thanks to KlausST for the excellent reply on the 'Changing Voltages' post.
The circuit that uses a PIR to activate a 555 timer which times the current
to lights in a closet works well. But used LED modules with a half dozen
5 mm thru hole LEDs. Have daisy...
Hello EDA forum,
Have developed circuit that uses a PIR sensor to drive a 555 timer and turn on a group of LEDs for a specific time.
This circuit and the PCB based on this schematic works. The PIR to 555 circuit is connected to a circuit/PCB called the
LED module.
Have connected the PIR to...
Hello EDABoard forum,
Trying to keep this simple because I think I make things to complex.
This configuration works as designed. That is when the PIR goes high output from the Arduino activates the transistor
and turns on the indicator LED on the transistor board on the left and the six...
Hello Danadakk, D123, AudioGuru, KlaussT and the EDABoard,
Thanks for all the excellent feedback.
Got the LED to glow using this configuration. (AudioGuru, sorry breadboards are disliked, but don't know of another way
to prove electrical theory before committing to a PCB.)
First tried...
Hello Danadakk, Klausst, d123 and the ED Board forum,
Danandak:
...Checker One does have LED reversed. The LED in ....Checker Two has the polarity of the LED correct but the circuit does not work.
Not sure what this means. I am a bit of a newb, so I know Ohms Law and some other concepts but...
Hello EDABoard forum,
Working on system that will takes the 5v output from an Arduino and turns on eighteen LEDs.
So using a BD437g transistor because more current is needed than the Uno will output.
Having trouble working and understanding how the BD437g so a simple circuit was created
This...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
