|
Homebrew li-ion battery pack into ubitx
I did not read the whole thread. However be careful not to overcharge lithium batteries. Even 10mA at over voltage can cause them to burn. The use if protection circuit and/or BMS snd/or dedicated bal
I did not read the whole thread. However be careful not to overcharge lithium batteries. Even 10mA at over voltage can cause them to burn. The use if protection circuit and/or BMS snd/or dedicated bal
|
By
Zvi Segal
· #86652
·
|
|
Just saying "Hello"
I plan to do something similar but I bought a 2000mAh NiMh battery as they are a little less temperamental than LiPo and Tenergy is a known brand. I also bought the Tenergy charger that I will plug in
I plan to do something similar but I bought a 2000mAh NiMh battery as they are a little less temperamental than LiPo and Tenergy is a known brand. I also bought the Tenergy charger that I will plug in
|
By
Richard DeMartini
· #86651
·
|
|
Just saying "Hello"
Jerry, Just in-case you didn’t see this……………….. Folks, A data sheet is usually a good start to avoid the “fake news”. This data extracted from https://www.eemb.com/. Ambient Temperature:25±5℃; Relativ
Jerry, Just in-case you didn’t see this……………….. Folks, A data sheet is usually a good start to avoid the “fake news”. This data extracted from https://www.eemb.com/. Ambient Temperature:25±5℃; Relativ
|
By
vk4amg@...
· #86650
·
|
|
Just saying "Hello"
The IRF510's would be quite happy with 16.8v, and would operate with less distortion for the same power out than they do at 12v. But you would need a 12v regulator such as the LM2940T-12 on the main u
The IRF510's would be quite happy with 16.8v, and would operate with less distortion for the same power out than they do at 12v. But you would need a 12v regulator such as the LM2940T-12 on the main u
|
By
Jerry Gaffke
· #86649
·
|
|
Just saying "Hello"
What about using 14430 LiFePO4 outdoor solar light batteries? They are 3.2v each so with 4 you would get 12.8v nominal. And they are available on Amazon.com in bulk quantities with or without charger.
What about using 14430 LiFePO4 outdoor solar light batteries? They are 3.2v each so with 4 you would get 12.8v nominal. And they are available on Amazon.com in bulk quantities with or without charger.
|
By
f.ketterman@...
· #86648
·
|
|
DIY Soldering Station
Nice find Arv, thanks for all you contribute
Nice find Arv, thanks for all you contribute
|
By
bigdswitzer
· #86647
·
|
|
Just saying "Hello"
Folks, A data sheet is usually a good start to avoid the “fake news”. This data extracted from https://www.eemb.com/. Ambient Temperature:25±5℃; Relative Huimdity:65±20% Nominal Voltage 3.7V per cell
Folks, A data sheet is usually a good start to avoid the “fake news”. This data extracted from https://www.eemb.com/. Ambient Temperature:25±5℃; Relative Huimdity:65±20% Nominal Voltage 3.7V per cell
|
By
vk4amg@...
· #86646
·
|
|
Homebrew li-ion battery pack into ubitx
Folks, A data sheet is usually a good start to avoid the “fake news”. This data extracted from https://www.eemb.com/. Ambient Temperature:25±5℃; Relative Huimdity:65±20% Nominal Voltage 3.7V per cell
Folks, A data sheet is usually a good start to avoid the “fake news”. This data extracted from https://www.eemb.com/. Ambient Temperature:25±5℃; Relative Huimdity:65±20% Nominal Voltage 3.7V per cell
|
By
vk4amg@...
· #86645
·
|
|
Just saying "Hello"
Folks, A data sheet is usually a good start to avoid the “fake news”. This data extracted from https://www.eemb.com/. Ambient Temperature:25±5℃; Relative Huimdity:65±20% Nominal Voltage 3.7V per cell
Folks, A data sheet is usually a good start to avoid the “fake news”. This data extracted from https://www.eemb.com/. Ambient Temperature:25±5℃; Relative Huimdity:65±20% Nominal Voltage 3.7V per cell
|
By
vk4amg@...
· #86644
·
|
|
Just saying "Hello"
Thank you Shirley, I thought I had heard about higher, full charge terminal voltages for those. The tables i looked at say 3.7 volts and nothing about that 4.2 volts. So using three of those cells sta
Thank you Shirley, I thought I had heard about higher, full charge terminal voltages for those. The tables i looked at say 3.7 volts and nothing about that 4.2 volts. So using three of those cells sta
|
By
Bill Cromwell
· #86643
·
|
|
Just saying "Hello"
GMTA {;->>>
By
Bob Lunsford
· #86642
·
|
|
Just saying "Hello"
Want a cheap and dirty way to reduce the 14.8V...? Put diode/s in series with the battery lead. Each power diode is 0.6V drop across the junction so two of them would drop the voltage by1.2V or 14.8 -
Want a cheap and dirty way to reduce the 14.8V...? Put diode/s in series with the battery lead. Each power diode is 0.6V drop across the junction so two of them would drop the voltage by1.2V or 14.8 -
|
By
Bob Lunsford
· #86641
·
|
|
Just saying "Hello"
Might be able to use the charge/discharge charts for 18650 cells and only charge your cells to 13.6 volts. Could also insert two power diodes in series with the 14.8V and have 13.6V for the radio. Arv
Might be able to use the charge/discharge charts for 18650 cells and only charge your cells to 13.6 volts. Could also insert two power diodes in series with the 14.8V and have 13.6V for the radio. Arv
|
By
Arv Evans
· #86640
·
|
|
Just saying "Hello"
A lead-acid battery cell voltage is 2.2V I charged the batteries I have and measured them. Real life check, surpasses high theory. +/- 6.43V if I remember correctly. You must be talking about another
A lead-acid battery cell voltage is 2.2V I charged the batteries I have and measured them. Real life check, surpasses high theory. +/- 6.43V if I remember correctly. You must be talking about another
|
By
Bob Lunsford
· #86639
·
|
|
Just saying "Hello"
That four cell battery would deliver 16.8V at full charge, which is much too high for a lot of ham gear. After you use up the first 10% of your battery's capacity it will drop to around 14.8V, which i
That four cell battery would deliver 16.8V at full charge, which is much too high for a lot of ham gear. After you use up the first 10% of your battery's capacity it will drop to around 14.8V, which i
|
By
Shirley Dulcey KE1L
· #86638
·
|
|
DIY Soldering Station
https://www.instructables.com/DIY-Digital-Soldering-Station/?utm_source=newsletter&utm_medium=email _._
https://www.instructables.com/DIY-Digital-Soldering-Station/?utm_source=newsletter&utm_medium=email _._
|
By
Arv Evans
· #86637
·
|
|
Replacing BNC with SO-239
Scott, The v3 to v5 ubitx used a similar connector and two separate insulated wires. I would use what you have pictured, just twisting them in a twisted pair. 73 Evan AC9TU
Scott, The v3 to v5 ubitx used a similar connector and two separate insulated wires. I would use what you have pictured, just twisting them in a twisted pair. 73 Evan AC9TU
|
By
Evan Hand
· #86636
·
|
|
Replacing BNC with SO-239
Scott, If you use this 2P black/red cable, be sure and check polarity. i.e. ground might be on red the way it looks to be keyed. You should have a 2P black/brown cable supplied with your kit. This is
Scott, If you use this 2P black/red cable, be sure and check polarity. i.e. ground might be on red the way it looks to be keyed. You should have a 2P black/brown cable supplied with your kit. This is
|
By
Gary Anderson
· #86635
·
|
|
Help with Nextion CEC Firmware
Elia, The v5 ubitx also has the 11.059MHz SSB filter. That was one of the changes from the v4. Here is a link to a v6 conversion on ubitx.net: http://ubitx.net/2020/01/06/a-v6-nextion-display-conversi
Elia, The v5 ubitx also has the 11.059MHz SSB filter. That was one of the changes from the v4. Here is a link to a v6 conversion on ubitx.net: http://ubitx.net/2020/01/06/a-v6-nextion-display-conversi
|
By
Evan Hand
· #86634
·
|
|
Shipping uBITX Radios Built With Universal Metal Cases
Hi, When we used to ship tube radios (does anybody remember those?) we bulled the tubes and sent them separately - for the same reason. The more things change the more they stay the same. 73, Bill KU8
Hi, When we used to ship tube radios (does anybody remember those?) we bulled the tubes and sent them separately - for the same reason. The more things change the more they stay the same. 73, Bill KU8
|
By
Bill Cromwell
· #86633
·
|