Electronics is sensational! We are going to make a homemade electronic piano. It is a very fun circuit, and easy to assemble.Materials:1 - ci 5551 - 510R resistor1 - 36k resistor1 - 24k resistor1 - 27k resistor1 - 15k resistor1 - 18k resistor1 - 100k resistor1 - 2 - 10nf resistor (103)1 - 10uF Electrolytic Capacitor1 - Loudspeaker1 - Cell phone charger or 9v battery5 - Push buttons, 1 - LeD

MSX Expert - Adaptador de teclado PS2Montado e testado em 15-abr-2021:Clicar em BOM (Bill of materials) nessa pagina para baixar o arquivo com o .HEX a ser gravado no PIC.Existe algumas falhas no layout da placa (descobertas apos a montagem):Os furos (3) para prender a parte externa no conector Minidin estao pequenos, foi preciso alagar com a furadeira e bronca de metal (1mm). O furo do pino 13 do conector do teclado esta um pouco distante, mas como usei cabo, nao tive problemas.Nao esquecer de liga o pino do terra, que esta acima dos 13 furos do conector do teclado do Expert, soldei dentro do conector, mas pode ser conectado no gabinete do Expert.https://luca.msxall.com/teclado_ps2_msx/teclado_ps2.htmNessa página, tem as configuracoes necessarias para a gravacao do PIC, tem um item que precisa ser alterado antes de gravar (CKDIV8 ! on ! off !) desmarcar.Se atentar sobre a opcao de gravacao definitiva (em alguns gravadores tem essa opcao, nao achei no gravador que usei). Recomendado deixar desmarcado.Esquema (também está dentro do arquivo BOM):https://luca.msxall.com/teclado_ps2/avr/teclado_avr_Expert.BMPO conector do PS2 precisa ser soldado para baixo pois está invertido no layout da placa, em caso de dúvidas, conferir no esquema.Pinagem do ATMEGA: https://datasheet.octopart.com/ATMEGA48P-20PU-Microchip-datasheet-62319947.pdfApesar do layout da placa ter sido feito para os 13 pinos do teclado serem conectados direto na entrada do teclado do Expert (devido ao tamanho da placa que fica encostando da entrada da impressora), recomendado soldar um cabo ou soldar pinos e conectar um cabo de extensao da placa para a entrada do teclado (deixando o adaptador como externo e afastado do gabinete pelo cabo).A ultimas tres fotos sao do prototipo que montei. Colocar soquetes para os CI′s e' opcional, coloquei apenas para facilitar na hora de testar.Teclados testados:Funcionou perfeitamente com teclado Compaq branco (antigo, BRAZIL 166516-206)Funcionou perfeitamente com teclado HP preto com prata (model no.: KB-0316, BRAZIL)Funcionou perfeitamente com teclado FABOR (86-SCNB/03-X)Funcionou parcialmente com teclado Logitech preto (Logitech Deluxe 250, falhou as teclas de funcao, setas, ESC e STOP (nao testei home, select, insert)).

PT2258 Volume ControlerThis circuit controls the volume of up to 6 channels from 0dB to -79dB.Connect this through I2C to a microcontroller, like an Arduino to control the volume. Sample code for Arduino below using this lib: https://github.com/sunrutcon/PT2258#include <PT2258.h> PT2258 volume; void setup() { volume.init(); volume.setMute(0); } void loop() { for (uint8_t i = 1; i < 80; i++) { volume.setMasterVolume(i); delay(100); } }

This project consist in a shield for ESP32 LoRa TTGO.The board contains power interface (Jack P4) and pins connection with screw terminals.Now with a huge 3 Amperes regulator. This shield is excellent for rf transmission!!!

This is a GPIO Extender for RaspberryPi or Arduino, based on SDA/SCL

Its my project about a Battery-Luminary only 3.7V and used 21 Leds 5mm and 21 Resistors 33R 1/4W

GRINTCH XMAS BADGEScary the cuddly? we don't know how to saythis is a PCB badge from the greenest cute Christmas monster.The leds under the eyes and details on the hat give all the charm to the project.

A christmas tree ornament made with 90 LED matrix, a buzzer, 8 touch buttons, powered by a rechargeable Li-ion battery. It uses a ATSAMD21 microcontroller, so it's compatible with Arduino and CircuitPython.It can show animations in the buit-in LED matrix, reproduce Chiptune sounds using the buzzer and interact with a user by touch buttons present in the circuit board. You can use it to play some simple games!The USB Type-C connector is used to charge the lil-ion battery and to upload firmware to the microcontroller.

I developed this project so that my students could learn about electronic solder of SMD and PHT components and also introduce knowledge about microcontroller and IOT programming. Each student will weld their own plate and take it home to continue their studies and solve homework during the course.

C1 - 100nf /50v 0805

This is a 100x65mm 555 timer heavily based on Evil Mad Scientist's Three Fives, almost identical. Buy theirs if you can. All Three Fives specs should apply. Works between 4V to 15V.Build instructions:Solder the brass nuts to the pads on the back side of the board. Use flux and a high power iron, or a heated plate, or a heat gun or a reflow oven.Solder the remaining components according their position. Every component value is labeled in the board.Install the 3D printed legs using the M3 bolts and nuts.Install the knobs with the M4 bolts.

Xmas tree that creates a 555 timer from transistors and resistors and configures it as an astable multi-vibrator to blink some LED's.Should be powered through 2x CR2032 batteries or through the pins at the bottom. Works between 4V to 15V, but may need higher value dropper resistors for the LED's when powered by more than 6V.A great way to learn soldering some pesky SMD components, mainly 0603 sized resistor, capacitors and LED's and SOT-23 sized transistors.This circuit has not yet been tested, but should work as it's based on a working model.

so i did a desing this board and is my first time, and was really hard, but now will be diferent because i now how to do. I just did this project because of Julia from Eletroblocks, she got a coupon of 20$ so thank you so much Julia and Pcbway S2. Explaining my project, i put a attiny85 to control the led the way i wanted, a buzzer to play songs and just that :)

I created this PCB for a championship, it was very hard becuase I didn't know nothing about PCB and PCB desing, but with some pratice I did this guy up here. This is to be an decoration for xmas tree, so when someone touch on thesse pads a buzzer will satrt playing Jingle Bells Music, all controlled by an ESP 32, everything energized by an CR2025

A simple PCB Badge for JuliaLab's Christmas PCB Contest

Decodificador BCDEste projeto é uma placa com dois displays de 7 segmentos, com um CI CD4511 (Decodificador BCD de 4 bits para displays Catodo Comum) para cada display Catodo Comum.Excelente para práticas e/ou projetos de Eletr?nica Digital.