**Capacitance meter with a current source to measure C from 1 pF to 400+ mF range**
At the beginning of a huge thank to you for the Dillon from EasyEDA Team for helping to make this documentation. Without him, t...
The EasyEDA "Tesseract" DIY Guitar Practice Amplifier is an LM386 based low power amplifier designed to deliver up to about 500mW into an
8 Ohm speaker when run from a 9V battery.
**Tesseract can be heard on YouTube here:**
The design given here - which includes a complete PCB design and Bill of Materials - is highly flexible and allows the several options...
This circuit is a charger for single-cell lithium (Li-Ion) and Polymer (LiPo) batteries. It can sources energy from DC jack connectors (two different dimensions) or USB-C or solar panel. It uses MCP73871 which has the peculiarity to smartly adjust the current sank, making it ideal for solar-powered applications, where the available energy could be really scarce and high-varying over time.
**[Buy ready to play ESPboy at Tindie.com](https://www.tindie.com/products/18194/)**
- [OSHWA certification record](https://certification.oshwa.org/ru000001.html)
- [Openhardware.io record](https://www.openhardware.io/view/786/ESPboy-Games-IoT-STEM-for-education-and-fun-ESP8266-core)
** ESPboy is an ultimate multi-gadget **
Absolutely open source,...
LiPo Power Board is a power manager for your battery-powered product. Since the *breakout* format, it is intended for prototyping and development. It is designed for a single cell LiPo battery (3,7V) and to supply 2 voltages: a fixed 3.3V and a secondary adjustable output, able to deliver higher voltage and current. A physical switch allows you to cut out the voltage on both channels. USB-C and Ja...
This is a simple arduino sheild that can run on it's own as an arduino uno once it's powered up using the power input. to upload a code, simply remove the **ATMEGA328p** from your reguar arduino board and place this sheild on top of it. Then plug ur arduino board and upload a code.If you want to burn the bootloader of ur ATMEGA328p chip, then udon't have to remove ur ATEGA38p chip from ur regular...
# Stefan Wagner assembled and running this cartridge #
Thanks Stefan for feedback.
Old cartridge for Commodore 64 it talking :)
![Thanks to JLCPCB.jpg](//image.easyeda.com/pullimage/YvMSGRgWN1bOEOnXqZJF3mFo2vBzwQChiz6Gz1h9.jpeg)
Modern earphones are not just (stereo) speakers, but they integrate a microphone and few buttons. All these components are available through a 4-pins 3.5mm plug (also known as TRRS). This schematic shows you how the microphone and buttons are connected through this connector. The common purpose of these buttons is music control, but in general, their behavior depends on the specific application. F...
Since somyone really cares about this project, I made it more readable ：）
This board contains:
Motor Drivers: Contains two l298n to drive two 550 motors, each chip allows 2A current, and 550 motor uses up to 3A current, that's why I made this special board to drive them. I fit the most common heatsink just onto these chips, CHECK if it fits your heatsink. They are critical.