Home › Forum › Hardware › DIY KIT1 assembly roundup/lessons: transistors swapped, high-resistance inductor › Reply To: DIY KIT1 assembly roundup/lessons: transistors swapped, high-resistance inductor

July 24, 2018 at 10:21 pm #5981
uRADMonitor
Keymaster

Hi @Sam,

Indeed the MPSA42 and the 2.2mH inductor are critical in terms of quality. But I wouldn’t blame the Chinese channels. After all, everything is made there, just be careful when you select the goods and the provider.

Please increase R1 from 100 to 1K and R2 to 47K.

What duty cycle does this give you? NExt try to change the frequency, in inverter.h, in the code. Try to reduce it by 1kHz until down to 10kHz. What do you see?

Here’s a nice chart I made from a similar circuit: https://www.pocketmagic.net/global-radiation-monitoring-network/#131005