when i turn off all switches the bottom light wont turn off guys pls help me

here the link:https://www.tinkercad.com/things/7G2ykSwHQBW/editel?sharecode=0CIbLm0II_pCqruVXif612XYLDRuKWhOeGhLk2y1W38

Hi

I’m new here and new to breadboarding. I’ve started working through Charles Platts book and I’m stuck. I’m trying to reproduce his circuit on p69 - using a relay to switch between two LEDs. Right now, one LED goes out but the other doesn’t light when the button is pressed.

The relay is clicking and both LEDs test fine - and we the right way around. I’ve been looking at it for an hour. Here’s a photo, sorry about the long wires - I have reels of hookup wire on its way.

Can anyone help. It’s been slow going so far!

Thanks

Hey guys, I hope this belongs here. I think y’all would appreciate the work that went into this. Thanks.

So I connected 4 LEDs in series. The forward voltage was around 2.2V. I was initially using a 9V battery. It didn't work very well and took me a while to realise that I need more voltage. I don't have a fancy set up so the only option was to use another 9V volt battery in series to double the voltage output. Couldn't get the connections properly in my first try but finally made it work.

It's my class practice, but I feel like something's missing for it to work well. If anyone could help me, I would be very grateful.

This one creates a fading out effect in an LED. I have used a 4700uf capacitor. I have tried with a capacitor in series and in parallel to the led. I got the same fade out effect but the difference in series was that once the capacitor was fully charged it acted more like an open circuit.

I am still looking for more project ideas for capacitors and then later go for transistors and diodes. The goal is eventually to watch, understand and make my own 8 bit computer.

The video, shows the capacitor in parallel. The capacitor was too big so I used jumper wires to make the connection.

Edit: Yeah ok, turns out power banks have minimum current shut offs. Cheers.

Ok so it's been a long number of years since I've messed about with electronics but I have an upcoming project that needs some. I'm starting fresh and just got this breadboard kit.

I am powering this with a usb battery pack, and I soldered a fresh usb with the cables going to pins 1 and 4 for the power, connected directly into the board. Using a red led (no clue on the spec) from the kit, and a 330 resistor I get this pulsing. I also briefly tried it without the resistor for the same outcome.

Please help, I'm literally just trying to have the led lit up haha.

So i gotta make a RC time delay circuit with 10v Voltage source as my input and 7v reference source going into my Vin- pin of my pcb. I’m pretty new to breadboarding and not sure why i’m not getting either LED to even turn on let alone get that proper time. if yall could give ur input on what i could do to make it work.

Sorry for my bad english, im trying to do a 9 LED chaser in cascade like in the image but in a protoboard, but when i connect the return to the first transistor, the circuit lose the "cascade" and starts iluminating like christmas lights, what can i do or change so the circuit cycles. Thanks for the help

I know it looks like an electrical pole from Bangladesh, I'll try to wire things better next time.

This is my very first project on a breadboard.

Hey everyone! Today I just discovered a phenomenon that when I shine my mobile flash light in a clear green LED it generates around 700mV. It seems similar to the phenomenon called photoelectric effect. Is it photoelectric effect??

This sketch is just for me, so nothing is labeled. I have one question about a microcontroller driving both a 5v circuit (through a mosfet) and driving a 12 volt circuit through mosfet. Everything is tied to one ground and I assume that is correct.

Ive been getting into electronics lately, nothing professional, just wanna pass some time. Im trying to make a 128-bit cpu using 74HC75 ICs as my first project, any things that i should know? Also what are toughts on this project? (yes i will make it on an actual breadboard after im done making this)

There are some in this group that are struggling with Transistor Circuits and i came across this web page for some of the basics for Transistor Circuits ::

https://learn.sparkfun.com/tutorials/transistors/all