**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...
# 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/...
# Legendary LM311 comparator - addition for STM32 discovery/nucleo for L/C measure #
![LM 311 LC meter.jpg](//image.easyeda.com/pullimage/7Okxq5DykgHnCnwNFLRkTub2UYa9Lmh6a4129xz4.jpeg)
![disco sh plus lcm merged top.jpg](//image.easyeda.com/pullimage/LQC1eyRJZIRFOzxIL3IuzkEtYxhQRH4rhLdPK3nV.jpeg)
![disco sh plus lcm merged bottom.jpg](//image.easyeda.com/pullimage/QNkrlEUThEK3aEwsCeKzoxJosEpS...
![555 C METER.png](//image.easyeda.com/pullimage/mcOJA7x4P3U8o93umkhTMK6P1FIKYIFxnxxfelKd.png)
Using 555 as a multivibrator we can measure the capacity of the connected capacitor.
At all times, the 555 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 discharging cycle....
Old cartridge for Commodore 64 it talking :)
![Thanks to JLCPCB.jpg](//image.easyeda.com/pullimage/YvMSGRgWN1bOEOnXqZJF3mFo2vBzwQChiz6Gz1h9.jpeg)