Re: Homebrew Valve Tester
Hi All,
Here is the PCB tracking and layout attachments.
The eagle eyed amongst you may notice some small differences between the layout and the photos. This is because I modified the original board, mainly adding a capacitor across the anode current sensing resistor and allowing a larger GM sensing resistor.
I havent built up the current board, although I have checked and re-checked the tracking I would recomend that you check for any errors yourself before etching. From past experience it is easy to overlook an error no matter how many times you look.
You will see that the LT mains transformer has no tracking connected to the pads. It seems that each manufacturer has their own pin connections, although most work on the same grid pitch. I have tried to make this as universal as possible, so connect links from the 240v input to the relevant pads on the transformer, likewise the secondary.
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