One of these arrived a few days ago ,I had checked other reviews online and wasnt hopping for much ,
Cost 12 dollars ,presoldered and ready to go out of the packet .
I found a grounding mod which did help a bit with noise
but I also replaced the caps on the V+ rail with branded low impedence items ,still a bit noisey ,left the unit on over night.....
This morning it was alot quieter and Im typically able to get a noise reading of less than one millivolt pp on the 10mV per division range , there was short term spikes of almost 10mV pp before I did any of the mods ,of course this was with the input grounded Im just doing a few more tests now ,but over all the waveform looks a lot cleaner with less wobble than before.
Im going to put a rotary encoder on to make adjustment faster ,but its all seems to work fine and the interface is simple .
Ok bandwidth starts to fade at around 40khz and the screen is no bigger than a couple of postage stamps , but for a simple quick tester for audio its great, well worth spending the extra on better electrolytics too, I'll post a few pics later of the mods and comparisons between noise before and after.
Cost 12 dollars ,presoldered and ready to go out of the packet .
I found a grounding mod which did help a bit with noise
but I also replaced the caps on the V+ rail with branded low impedence items ,still a bit noisey ,left the unit on over night.....
This morning it was alot quieter and Im typically able to get a noise reading of less than one millivolt pp on the 10mV per division range , there was short term spikes of almost 10mV pp before I did any of the mods ,of course this was with the input grounded Im just doing a few more tests now ,but over all the waveform looks a lot cleaner with less wobble than before.
Im going to put a rotary encoder on to make adjustment faster ,but its all seems to work fine and the interface is simple .
Ok bandwidth starts to fade at around 40khz and the screen is no bigger than a couple of postage stamps , but for a simple quick tester for audio its great, well worth spending the extra on better electrolytics too, I'll post a few pics later of the mods and comparisons between noise before and after.