Beginner circuits / ↓ the voltage & ↑ the efficiency

[SCHROEDERFPM]

TL;DR Summary

Hi.

So I'm beginning to teach myself the basics and I'm working on a motorised lamp made from two camera lenses taken apart and assembled together.

I'm looking for help with wiring the motor and led together, and how to best set up my circuit.


(Mind you, I have literally just begun and have basically no clue what I'm doing but I'm making strides, so please as much detail as you would like to share would be helpful)

So far this is what I have:
I have the power source, two triple in a battery case, negative to the T emitter, T output to the (-) of motor, T base through a resistor to the switch, switch to the (+) of motor.

I tried wiring the Led to this junction and the switch, but either the motor or the switch works not both simultaneously.
I tried wiring them parallel but I'm having some of the same issues, that or the led just stays on all the time or needs a seperate switch so I'm doing something wrong.

The second thing I'm working on is another lamp thing but with a fan inside, and this uses a 15v 3a wall input. For this one I tried to follow a blueprint for a system using two transistors to manage higher voltage as I'm just using a small cal and maybe one led in this.
This is a bit more out of my experience but I'll post a photo and any advice would be helpful.
(This is not connected yet just trying to figure out how to wire it.)

 

[DaveE]

I have the power source, two triple in a battery case, negative to the T emitter, T output to the (-) of motor, T base through a resistor to the switch, switch to the (+) of motor.

Sorry, but this verbal description is a poor substitute for a schematic. I could draw it myself (maybe), but I'd rather YOU do it for YOUR problem.

You simply can't do electronics well if you can't draw simple schematics. You also won't get as much help if you make us do the grunt work for you.

The second thing I'm working on...

Should probably be a second thread.

 

[SCHROEDERFPM]

This is my reference for the second one, although I'm not sure my layout is perfect and I'm missing a diode,.

 

[SCHROEDERFPM]

↓

 

[Baluncore]

Are all electrical engineers nasty people?

Mentor note: the post that contained the quote above has been deleted for violating forum rules.
No. They just appear that way to beginners, some of whom think that engineers must be mind readers. We can be quite good at guessing sometimes.

The language of electronics, is the schematic circuit diagram.
A clear picture is worth a thousand words.
https://en.wikipedia.org/wiki/Electronic_symbol

Regarding the big, black, three-terminal components, in post #4, what are their full part numbers?
Please give us a web link to the source of the circuit(s) you are building.

 

[SCHROEDERFPM]

Https://itp.nyu.edu/physcomp/labs/m...-a-transistor-to-control-a-high-current-load/

 

[SCHROEDERFPM]

Three terminal components

 

[Dullard]

some advice (per your request):
Get an introductory book. Read it. You are literally trying to have a conversation in a language that you don't speak.

 

[Baluncore]

The picture you show has two NPN power transistors, marked D2394. They are part number 2SD2394, as a "2S" prefix is assumed on bipolar transistors numbered in the Asian series.
https://z3d9b7u8.stackpathcdn.com/pdf-down/2/S/D/2SD2394_SavantIC.pdf

While that 2SD2394 device is OK for the transistor, one of those devices needs to be a voltage regulator. The 5 volt regulator will have a part number like 7805.
See figure 14 in your web reference.

 

[SCHROEDERFPM]

The picture you show has two NPN power transistors, marked D2394. They are part number 2SD2394, as a "2S" prefix is assumed on bipolar transistors numbered in the Asian series.
https://z3d9b7u8.stackpathcdn.com/pdf-down/2/S/D/2SD2394_SavantIC.pdf

While that 2SD2394 device is OK for the transistor, one of those devices needs to be a voltage regulator. The 5 volt regulator will have a part number like 7805.
See figure 14 in your web reference.

Thankyou.
I appreciate the help Does it matter which one?
And is it just a matter of time and learning these part numbers / looking them up? I understand a voltage regulator and transistor are different but not quite sure how to tell .

 

[SCHROEDERFPM]

You are literally trying to have a conversation in a language that you don't speak.

I'm pretty good with foreign languages, and you gotta start somewhere right?

No reason I can't tinker while I learn.

 

[Baluncore]

Does it matter which one?

Yes, because the connections are different, and they are in different places in the circuit.

And is it just a matter of time and learning these part numbers / looking them up?

Yes. I have been doing it for more than 50 years. I would have learned quicker, if I'd had someone to ask for help.

I understand a voltage regulator and transistor are different but not quite sure how to tell .

The only visible difference is in the part numbers. The physical package is standard.

 

[berkeman]

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