•Channel on Youtube / Канал на Ютуб: https://www.youtube.com/channel/UCyVzmkYMe5pQK0HMWgyaE9Q?view_as=subscriber
•Vidio on Youtube / Видио на Ютуб: https://youtu.be/Mwh9Z-UxknA
•Project circuit / Схема проекта: https://easyeda.com/romans.dodu/LED_Vu_meter_LM3915
•Archive with LED Vu meter LM3915 files link: http / Архив с файлами светодиодного индикатора звука на LM3915 ссылка: http://tiny.cc/m...
CD Changer Emulator for Nissan Maxima, Pathfinder and Infinity I30. Allows to play mp3 and wav files from USB stick and micro SD card. Pretends to be cd changer to head unit, therefore all head unit and steering wheel controls supported. Based on DFPlayer Mini board and ATTiny85.
Source code available at [github](https://github.com/CppBaddy/Nissan-CD-Changer-Emulator)
> I got a lot of messages about the project, or the code, but the situation was I put the project on hold for a while, when waiting for parts to arrive, then modified multiple times without documenting etc... the project got finished working well, heat up quickly, but when I have time I will make a fully documented mark 2 version.
Old cartridge for Commodore 64 it talking :)
![Thanks to JLCPCB.jpg](//image.easyeda.com/pullimage/YvMSGRgWN1bOEOnXqZJF3mFo2vBzwQChiz6Gz1h9.jpeg)
**ECG Arduino shield**
it is the electrical activities of the heart. During each heartbeat, a healthy heart has an orderly progression of depolarization that starts with pacemaker cells in the sinoatrial node, spreads out through the atrium, passes through the atrioventricular node down into the bundle of His and into the Purkinje fibe...
Apesar do nome estranho, o projeto possui as funcionalidades do título.
A primeira é um "**caçador de vampiros**" de energia (baseado no projeto TOMADA INTELIGENTE do Br-Arduino.org com uso do Attiny85), que consiste em eliminar o consumo de energia dos equipamentos em espera (stand by). Diferente do Tomada Inteligente, este não faz uso de uma régua, mas sim de uma caixa que seria o "interrupt...
**Stun gun** is a device which generates high voltage at it’s output by taking low voltage as input. Concept of this device is based on High volt inverter. Here we are building this **Stun Gun circuit on PCB** and below you can find the required circuit diagram and PCB layouts to build this stun gun yourself.
For complete details about the circuit with instructions on how to design this circuit...
A high-quality microphone preamplifier using a single power supply, suitable for dynamic or electret microphones. All right reserved to Andy Collison, the author of this preamplifier, more info [here](http://www.zen22142.zen.co.uk/Circuits/Audio/lf071_mic.htm)
I want present to you my new version of the Bluetooth module for a car, home whatever you want.
This module base on the BK8000L module with an additional power scheme for working with car voltage. But it’s also can work by USB.
You can ask me why need to create something new if you can easily buy already exists solution from China?
Here are some pluses:
1. It works.
2. Noise reduction fr...
# Addition for STM32 discovery/nucleo for L/C measure #
![LM 393 LC meter.jpg](//image.easyeda.com/pullimage/Xf9og3xv0VKbZ6QSkXsz1Y2ViCPYv6ay1rW9pzmY.jpeg)
![disco sh plus lcm merged top.jpg](//image.easyeda.com/pullimage/PH0RNomSP4RWTe5KR26NjTiPTzkTe94ACJlbghgD.jpeg)
![disco sh plus lcm merged bottom.jpg](//image.easyeda.com/pullimage/thOhv5tdVPsLGIBEYk4NwwL7T9XWhP1WPlvRs2zS.jpeg)
![556 C meter 2 ranges.png](//image.easyeda.com/pullimage/sRbpQWtQFjjlgqhuY0fywZnC8BT5Q9rVEZ06BTHK.png)
Using 555/6 as a multivibrator we can measure the capacity of the connected capacitor.
At all times, the 555/6 charges to 2/3 VCC and discharges to 1/3 VCC the connected capacitor, supplying a rectangular signal at the output in accordance with the capacitor charging and dischar...
1. For L/C meassure by LM311 and oscillation circuit.
2. For FREQ meassure by special input circuit with a capacitive coupling
3. For C meassure by 556N freq to C - range 1-1000 pF
4. For C meassure by 556N freq to C - range 1-1000 nF
![multi freq meter V_02 cover.jpg](//image.easyeda.com/pullimage/YyWhE1CwRVAFl7XpCxxjQZ6YGdweU7GAEVO5MXL3.jpeg)
![multi freq meter V_02.jpg](//image.easyeda.com/...