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by neilsm
Tue Dec 22, 2015 10:33 pm
Forum: DSO138
Topic: Yet another seller of fakes; noise problem [SOLVED]
Replies: 5
Views: 8306

Re: Yet another seller of fakes; noise problem

An auto battery is usually over 14 volts. I would not use this.
Sanja wrote:I will probably use few diodes to create necessary voltage drop then.
Are you in the USA?
No, Europe. Wall AC power is 50Hz.
I would find a wall power supply or use dry cells in a holder.
by neilsm
Tue Dec 22, 2015 1:26 am
Forum: DSO138
Topic: Yet another seller of fakes; noise problem [SOLVED]
Replies: 5
Views: 8306

Re: Yet another seller of fakes; noise problem

update: I changed the caps and the board works stable now. But the noise is still there. I wanted to test it with battery instead of wall ac/dc adapter, but don't have any 9V battery. Is it safe to test it with spare 12V car battery instead? An auto battery is usually over 14 volts. I would not use...
by neilsm
Tue Dec 22, 2015 1:19 am
Forum: DSO138
Topic: How to tell your board is counterfeit or not?
Replies: 34
Views: 120933

Re: How to tell your board is counterfeit or not?

I just bought a kit from roboticreep on eBay. Is this a trusted seller? I see no ID sticker and it came with no instructions.

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