开云体育

I rather agree with you Jerry, the hostility shown to you on this group is appalling. There's a lot of people who should be ashamed of themselves. From what Hans has said on previous occasions some

According to the datasheet your oscilloscope is rated for up to 400 volts peak, or 800 volts peak-to-peak. The limiting factor will be the oscilloscope's ability to attenuate the signal into its

Just did factory reset, and its working!!!

I'll bow to your experience. In my case, I don't think the short would have been fixed by moving Q103--There was a genuine solder bridge that I could see, independent of Q103's position! This was my

Hans, At one time I too thought that it was the current that mattered because I believed latchup was the issue. Later I understood that view to be wrong. The spec is clear in that it speaks to a

Hi Paul Moving Q103 always works. It always clears the short. I've done upward of a hundred. It always works afterward. However we have to accept that it's a delicate operation and not everyone will

Hi John Note that in STM32 all pins are configured as inputs at power-up by default until you change something. At such time as the code changes the GPIO pin to an output, it will certainly have no

Try adjusting the LCD brightness, turn it all the way counter clockwise.? I made same mistake when I first turned mine on. Good luck? 73 Emory? WM3M

Does this mean that the firmware was installed successfully? I hear radio noise in my headphones. The volume is adjustable. When I press the left encoder, the radio turns off. What could be the cause

Typo ...that should be section 6.3

Apparently, moving Q103 works for some people and not for others... I actually had a solder bridge, in addition to the positioning of Q103 over the pad for Q104. In my case, I used an air gun to lift

Simon, Kees, For those of us who do not like plowing through datasheets, STM's application note AN4899 could be the short-cut to understanding what happened. See section 6.30 (Voltage protection when

Mike-- Jeff Moore is one of several people here who often repair stuff for others. He just looked at my QMX to see if I'd missed something, and unfortunately we both agreed that my MCU got fried

Simon, A short between VDD and Ground is not a good sign. One individual commented that he found a short between SMPS connector pin #4 and Ground and cleared it. It could be a bad capacitor or a bad

The only other thing I did was reheat the Source and Gate pins on Q103 to relieve any built up stresses from twisting the part a little. I don't think any pad insulation is required. 73 Kees K5BCQ

After I blew the finals in my 12v QDX high band (still don't know how - no antenna tuner), I replaced all 4 with VN0606's after reading many discussions here. I'm also running with reduce voltage at

The big cap limits the rate of output voltage change in response to input changes, too, making a 1 KHz sample rate more able to cope without big overshoots.

Re grounding Solder some thick wires or pins from the antenna sockets ground and a few other GND points around the board (Don’t get suckered by the idea that the impedance at the antenna is 50.0

Doing it fairly properly : tx to dummy load via BNC T connector at the load end, shortest leads possible 10x scope probe into open socket port of T connector and earth clip to T connector surround. ?

Greetings all, Having recently purchased a Siglent SDS1202X-E, I am faced with 2 immediate questions. 1 – What is the safest and most accurate way to measure output power? I would think that a