Best source for info like that is a manufacturers data sheet. Second best is a comparable gel cell battery data sheet. https://www.power-sonic.com is my goto. BTW, that is likely 3.75 or 4 A-h or Amp-

#power

Hydrogen peroxide is not an accelerant, it’s an oxidizer. Most acids, including hydro-chloric and acetic (vinegar) will not dissolve copper on their own, they need an oxidizer too. Nitric acid will do

As I understand it, the 15 dB limit is to keep CBers from using one to boost their output to the kilowatt range. 15 dB limits the output to around 150W. Clark Martin KK6ISP Yet another designated driv

I have saw like this: https://www.amazon.com/Woodworking-Precision-Benchtop-Polisher-Electric/dp/B07R3XLHJ5/ref=sr_1_11?dchild=1&keywords=Hobby+table+saw&qid=1618605327&sr=8-11 It works quite well. Cl

Clark Martin KK6ISP Yet another designated driver on the information super highway. In the same lab I previously mentioned, there was another project, a basic power supply, transformer, bridge rectifi

In junior high ( a few decades ago) we had to complete certain projects before we could work on what we wanted to. One was a simple metal chassis with three tube sockets mounted with various wires con

With three CPU lines and shift registers you could operate as many relays as you need. An you can get a chip that is a shift register and relay driver in one, the TPIC6B595. To get the full value of t

Watch for whether the MCU is pre-programmed. Mine was and the e-bay page said so but some are not. I haven’t seen any programming interface on the board but I’m not familiar with PIC programming (one

For SMD I’ve found the following helpful. Headset magnifier fine tweezers practice Both with a conventional soldering iron and my hot air rework station, I practiced on desoldering components till I g

Use the some model of relay as in the antenna tuner. If it isn’t adequate, the tuner is in trouble. Clark Martin KK6ISP

Check the relays. If it’s in all bands then check the T/R relay, if it’s just some bands, check the filter relays. In either case bad relay contacts would account for both problems. Sent from an iPhon

#v3 #ubitx #ubitx-help

Check the numbers for maximum charging current to the battery and make sure your panel doesn’t exceed it. A few charge controllers let you set a maximum charge current but most don’t. Clark Martin KK6

If you have a variable voltage supply use that while monitoring the current to slowly increase the supply voltage until the current gets up to around 200 mA. Then start probing see where the current i

Cheap replacement unless it’s failure mode is to send Vin to Vout, then… ouch. Clark Martin KK6ISP

To verify, if you have a low power transmitter (oscillator) that can tune around the offending AM BCB frequency, turn it on near the µBitX and see if you can interfere with the interfering signal. If

#ubitx

hex files are executable images, i.e. you don’t compile them, they’ve already been compiled and linked. To download it to the arduino you need to use avrdude directly. Something like: avrdude -p atmeg

#ubitx

It’s the black wire connected to the black terminal. It just has a strip of red from where it separated from the red wire. Clark Martin KK6ISP

#ubitx

No need to “steal”, you can just “use" it.:) Yes, one MCU’s outputs can certainly be another MCU’s input. No resistor or pull up or down is needed, the output is driven high or low. Any MCU’s input is

One of my goto tools is a logic probe. It’s 30-40 years old, the LEDs are a little hard to read at times but it still works great. It would quickly diagnose a problem like this by testing each pin of

Additionally, for the SSB tests what was the AF signal source? Clark Martin KK6ISP