- Last Updated: Wednesday, 30 April 2014 16:11
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Here is the description of a simple capacitance and inductance meter, easy to build, based around a PIC microcontroler. Simplicity does not mean poor characteristics. The precision is very good and even better than many commercial LCmeter !
The original description has been done by Phil Rice VK3BHR on his pages. I only did adapt it to my needs.
Here are the main characteristics :
- measures from 0 to 838 nF and 0 to 83.88mH.
- precision +/- 1%
- printed board eliminating any connecting wires.
- use of common case (at least here in Europe).
- use of common components.
- Last Updated: Saturday, 11 May 2013 06:27
- Hits: 21987
The orinality of this description is that the tone generation is made by the use of a DDS and not a sine wave generator made with transistors or a special circuit. It also does not use any special and expensive component but only junk box components, or at least cheap ones !
The main characteristics of this generator are :
- Two tone generator 800/ 1000 Hz or 400/2600 Hz (jumper selectable)
- Single tone generator of 1000 Hz
- Ajustable output level, max around 100 mV pp on 600 Ohm, or 35,4 mV eff. in single tone or 25,0 mV eff. in 2 tones
- Spectral purity between 0,3 and 150 kHz > 50dB !
- Distorsion <0,01% (in single tone) !
- Supplied by a 9V battery, consumption 7-8 mA that gives 50 working hours with an alcaline battery.
- Automatic PTT switching at power on.
This circuit has originaly been described by DH7AHN ,adapted and translated by myself for my usage. The original description can be found hereWrite comment (2 Comments)