Search found 78 matches
- Mon Jul 06, 2015 12:14 am
- Forum: DSO138
- Topic: New kits - 13803/4K - F/W .050
- Replies: 43
- Views: 51557
Re: New kits - 13803/4K - F/W .050
Which area of the board would it be most appropriate to photograph?
- Sun Jul 05, 2015 11:17 am
- Forum: DSO138
- Topic: Has anyone updated their dso138 to make it better?
- Replies: 5
- Views: 7741
Re: Has anyone updated their dso138 to make it better?
046 is on their website
- Sun Jul 05, 2015 11:13 am
- Forum: DSO138
- Topic: New kits - 13803/4K - F/W .050
- Replies: 43
- Views: 51557
Re: New kits - 13803/4K - F/W .050
MorganFlint, You are correct. After I shut the computer down I thought I had got it wrong. I had a look through board.c and couldn't spot what I was looking for. However, we use the STM32 series at work so I'll talk with the guru. Also, bought mine from Banggood. There is one outfit (taibo?) selling...
- Sat Jul 04, 2015 10:45 am
- Forum: DSO138
- Topic: Wrong resistors ( may i burn it ? )
- Replies: 3
- Views: 6001
Re: Wrong resistors ( may i burn it ? )
Not obvious to me that wrong values for those components would cause your problem. Suggest you have made another mistake. Did you not use the SMD resistors supplied in the kit?
The resistors you mention would have some effect of the gains of the various stages, not their operating points.
The resistors you mention would have some effect of the gains of the various stages, not their operating points.
- Sat Jul 04, 2015 10:40 am
- Forum: DSO138
- Topic: New kits - 13803/4K - F/W .050
- Replies: 43
- Views: 51557
Re: New kits - 13803/4K - F/W .050
So, by reducing the gain of U2C significantly and doing something in S/W (maybe ADC setup) they manage to reduce the noise artifacts considerably.
Seems something else has to suffer here, ie resolution or ?
Seems something else has to suffer here, ie resolution or ?
- Tue Jun 23, 2015 8:48 am
- Forum: DSO138
- Topic: Firmware 113 13801 046
- Replies: 1
- Views: 4167
Firmware 113 13801 046
The unit I received from banggood.com has firmware version 113 13801 046
Are they any new features with this version?
Thanks,
Dave
Are they any new features with this version?
Thanks,
Dave
- Tue Jun 23, 2015 8:41 am
- Forum: DSO138
- Topic: Circuit modifications
- Replies: 0
- Views: 4620
Circuit modifications
Noticed a significant droop on low frequency square waves, say 10-100Hz. Changed C1 to a 1uF 50V mylar. Next, if thought I have a look at trying to get rid of the artifacts (noise spikes) which I see on the 1kHz test signal at a timebase setting of 0.5ms. With another oscilloscope and probing around...
- Sun Jun 21, 2015 10:48 pm
- Forum: DSO138
- Topic: Assembly and calibration hints
- Replies: 0
- Views: 4074
Assembly and calibration hints
Leave protective plastic sheet on display until everything is working. This will protect the screen from any marks caused by solder splashes, etc. Be careful when inserting the LCD module. Apply even pressure on both ends on the 40 pin header whilst guiding in the two 2 pin connectors. Adjusting C6 ...