Search found 3 matches
- Tue Dec 06, 2016 12:02 am
- Forum: DSO Shell
- Topic: Is the kit supposed to come with a knob?
- Replies: 2
- Views: 4994
Is the kit supposed to come with a knob?
I ordered my kit from Banggood as soon as I saw that it was available. I recently put it together, and discovered that it didn't have a knob for the rotary encoder. I recall previous pictures that showed the assembled version with a knob, but the current pictures do not show it. Was there supposed t...
- Sun Oct 09, 2016 5:59 pm
- Forum: DSO138
- Topic: DC measurements not accurate
- Replies: 4
- Views: 8700
Re: DC measurements not accurate
The DSO138 is fairly sensitive to the power supply. I've found that the minimum voltage needed to operate correctly is somewhat over 6.8V and somewhat under 12V. This low voltage level is due to the reverse voltage protection diode, a 1N4004 that will drop 0.6V - 0.7V, and the LM78L05 positive volta...
- Tue Oct 04, 2016 4:59 am
- Forum: DSO138
- Topic: Smoke whilst connected to 12v
- Replies: 1
- Views: 4643
Re: Smoke whilst connected to 12v
As you probably know, that resistor in the supply path for the LCD backlight. I'm guessing that if you can see the LCD, no further damage has been done. The input power feeds only three circuit directly: The +5V regulator, a LM78L05 in a TO92 package. The 78L05 is good to about 35V input voltage. At...