**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...
Laser Alarm System Trigger V2
By: Tyler Le
This is the second model of the receiving end of a DIY laser-based alarm system. The first one will not be published. Also, this circuit has been tested on a simulator [http://www.falstad.com/circuit/] and it seems to work great.
This alarm will normally have a laser shinin...
Old cartridge for Commodore 64 it talking :)
![Thanks to JLCPCB.jpg](//image.easyeda.com/pullimage/YvMSGRgWN1bOEOnXqZJF3mFo2vBzwQChiz6Gz1h9.jpeg)
This is a small pcb that is designed to be used on an electric go-kart to display a stopwatch, motor RPMs, and cart speed as well as record this data on an SD card with a time stamp for analysis. The project is Arduino based and is ran off of 7-59 VDC or directly from a 5V source through any of the 5V or VIN pins on the data logger shield (this is not a protected input). It is designed to have w...
This is a conversion of my project C_meter_ATtiny2313
from Attiny2313 to shield for Arduino uno R3. All describe about a techique is actual.
Build is in progress.
![Arduino shield C meter.jpg](//image.easyeda.com/pullimage/cmcR4bp9r6REuaK0K7azckK9Ys9aIygHGYIIizTC.jpeg)
# 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/...