Search found 13 matches

by viewu
Sun Mar 17, 2019 12:27 pm
Forum: DSO138
Topic: Changeup
Replies: 0
Views: 1834

Changeup

I would like to change my DSO138 LED the green lamp for a brighter one. I saw one online I wanted. They were rectangle 2mm wide and 4mm long. Does anyone know this ? Picture attached
by viewu
Fri Mar 01, 2019 7:37 pm
Forum: jyeLab
Topic: KIT DSO
Replies: 1
Views: 10058

KIT DSO

Where can the schematic for DSO-Shell DSO150 15002k be found?
by viewu
Wed Feb 20, 2019 6:05 pm
Forum: jyeLab
Topic: Diode
Replies: 0
Views: 4939

Diode

If you only have silicon diodes; but need some germanium diodes; what could be done to modify those silicon diodes? If this modification deals in doping, what technique has to be used? :geek:








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by viewu
Fri Aug 31, 2018 12:28 am
Forum: DSO138
Topic: +3.3v not simple
Replies: 3
Views: 3508

Re: +3.3v not simple

Rainer I believe your diagnosis is on the QT. I open J4 and tested U1 pin9 : D3 anode: JP4 the right point; J6 pin1, all were shorted. So now what can be done? I can not see though the replacement of U1. Can you? If you can, how? Viewv
by viewu
Fri Aug 24, 2018 11:20 pm
Forum: DSO138
Topic: +3.3v not simple
Replies: 3
Views: 3508

+3.3v not simple

My DSO138 has a problem I found was not simple. The +3.3v is short to ground. I first tried fix it by replacing U3. This did not fix the problem. So I removed other part in the area and test them with my meter. Parts tested good. I wanted to test U1 for the short, I had no way of doing this. Can any...
by viewu
Sat Aug 11, 2018 8:38 pm
Forum: DSO138
Topic: Tools
Replies: 4
Views: 4353

Re: Tools

To view when need.
by viewu
Wed Aug 01, 2018 6:17 pm
Forum: DSO138
Topic: Tools
Replies: 4
Views: 4353

Re: Tools

I found this circuit which test Xtal . No explanation how it works. Does anybody have any idea how it work?
by viewu
Tue Jul 31, 2018 2:57 am
Forum: DSO138
Topic: Tools
Replies: 4
Views: 4353

Tools

When no display, what tool must be used to check Y1?
by viewu
Wed Apr 18, 2018 12:36 am
Forum: DSO138
Topic: DOS TRACE VOLTAGE
Replies: 2
Views: 3014

Re: DOS TRACE VOLTAGE

This one is a hard one to find.
by viewu
Fri Mar 16, 2018 6:46 pm
Forum: DSO138
Topic: DOS TRACE VOLTAGE
Replies: 2
Views: 3014

Re: DOS TRACE VOLTAGE

I just got the traces, and man are they pretty. I can trace more. If you think the schematics are something, wait till you view the trace circuit.