Just finished and tested my USB lc meter project.
Its basically just an oscillator and a PIC micro measures the oscillation frequency and passes that to the PC via the USB bus.
The switch either puts an inductor or capacitor in parallel with the component under test.
For capacitors over 1uf the PIC simply charges up the capacitor and measures how long it takes.
Its basically just an oscillator and a PIC micro measures the oscillation frequency and passes that to the PC via the USB bus.
The switch either puts an inductor or capacitor in parallel with the component under test.
For capacitors over 1uf the PIC simply charges up the capacitor and measures how long it takes.
An externally hosted image should be here but it was not working when we last tested it.
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Nigel, this might be of interest to you:
AVR Transistortester – Mikrocontroller.net
It details a multi-component tester based around the ATMega platform. While I know it won't be a 1:1 conversion (going from AVR to PIC) it still might help you algorithmic-ly. It is an open-source project (that most of the Chinese multi-tester boards are based upon). It is still under active development with the english language discussion thread here: https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/
AVR Transistortester – Mikrocontroller.net
It details a multi-component tester based around the ATMega platform. While I know it won't be a 1:1 conversion (going from AVR to PIC) it still might help you algorithmic-ly. It is an open-source project (that most of the Chinese multi-tester boards are based upon). It is still under active development with the english language discussion thread here: https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/
I had been thinking about a semiconductor analyser.
There are already a few on market that are quite clever.
On one you can connect a transistor up any way you like and it works out for itself which pin is BCE.
I have one which even does CE breakdown voltage.
They were both over £60 so a cheap alternative would sell well.
The ones made based off the design I liked to only run about $20 on eBay.
Got pcb's through for the LM393N version and built one up.
Works very well, the oscillator is very stable with clean edges on the waveform.
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