I've built them from a kit of components.
- IZ1PMX VNA vector network analyzer from 2 Mhz to 180Mhz
- Multifunction tester, very cheap.
Is a Vector Network Analyzer, based on a projetc of Alfredo IZ1PMX
It's based on a Atmel Processor ATmega and a AD9951 DDS.
The instrument has a frequency range from 2Mhz to 180Mhz but test has been done to 250 Mhz.
It's a really cheap kit, has a good price to performace ratio
The reference site is:
I needed an Electrolytic ESR meter so searching on internet ad blogs I found this little an very very cheap instrument base on an Atmel atMega processor.
The funny is that this instrument reads completely automatically also:
- Electrolytic ESR
Detect and give information's about:
It's a really useful instrument especially when a component has to be tested or it's of unknown type.
The gear is electrically simple, all the operations are done by the microcontroller and the software.
It can be found on some online cinese shops.