/r/electronics
Discussion and news about component-level electronic circuits.
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/r/electronics
I started tinkering with transistors because it’s what I am mostly learning this semester. First I tried to control output using the PWM pin from my RPi. After that I got the idea of building an RC car and doing the input to the motor from scratch. My first working test is an H-bridge using 4 npn and 2 pnp transistors with modulation through the Q2 and Q4 npn.
Right now I can generate a rectangular wave. The 2 LEDs are in opposite directions, so a positive voltage turns one and a negative the other. The This week I want to bring it to uni and test the sinusoidal generation and efficiency with the oscilloscope.
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Just wanted to share my first dc circuit, it is for my first circuits class, as a end of semester project.
It consist in just a relay, a 1000uf capacitor and a 330 ohm resistor.
It still is not the proper or final circuit, as I'm using a 5v relay with 12v as power source. Also it is conected in the "inverse way" as the leds need to imitate signal lights from a car.
Tomorrow I will buy the correct parts but for the moment I'm happy to see that this works and I can do the math to understand it !
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I have mad respect for anyone who nails a well-designed PCB on the first go. Meanwhile, I'm embracing the 'iterative approach'—which is a fancy way of saying I make a lot of prototypes and have a constant love-hate relationship with my own designs.
Take, for instance, my simple mix-mode display side project. All I wanted was a nice combo of a 7-segment displays, LEDs, and a bargraph, controlled by a MAX7221 for some other projects. Easy, right? Well, fast forward two years, and I've got a beautiful timeline of my trials, errors, and the occasional "Aha!" moments. Honestly, it's been a journey. My first design was basically a cry for help, but now it's evolved to the point where I am okay with it. But hey, it works now for my main projects.
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In ireland we call rain sensors outdoor normally closed switchs
Alarm that counts using a 7-segment display. Added the ability to use a single scr to latch and power an led with a battery, since the most important element is to have a way to know whether someone is inside waiting to do you harm. A single led accomplishes this. Here's the pcb, and Photoshop even gives me the ability to label it. I simple head over to my local library, and have them print this onto this special paper with their laser printer, and then iron & etch it.