Electronics > Beginners

Pulling my hair out. Circuit boards stop working once shipped to client and more

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mcinque:

--- Quote from: Jackster on June 06, 2019, 12:25:38 pm ---Will a £50 USB one be enough?

--- End quote ---

An USB like that has a very very low bandwidth; you need at least double bandwitdh of your clock.
However a proper real DSO with proper knobs on the chassis is much more confortable to use.

Like Mike said, without one you're really wasting your time.

tggzzz:

--- Quote from: Jackster on June 06, 2019, 12:01:50 pm ---I don't have an oscilloscope. Just multi meter.

--- End quote ---

That was the equipment I used as an amateur when I was still at school. It got me a long way, but I knew when it wasn't sufficient and used a scope where necessary.

Quite frankly I'm surprised you do still have paying clients.

tggzzz:

--- Quote from: mcinque on June 06, 2019, 01:43:08 pm ---you need at least double bandwitdh of your clock.

--- End quote ---

False. All that matters is the transition time; the period/frequency is irrelevant.

For an outline of the theory and some measurements, see https://entertaininghacks.wordpress.com/2018/05/08/digital-signal-integrity-and-bandwidth-signals-risetime-is-important-period-is-irrelevant/

tszaboo:
You dont have power supply bypassing. Whatever you put there is not enough, too far and so on. You dont even have a ceramic cap next to that FTDI chip. I'm not surprised it is not working.

Jackster:
So something like the Hantek DSO5102P?

Even so, would it even be worth it if I need to hire someone to remake the circuit anyway...
And it would take a while to learn how to use the thing..

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