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How much current can Baofeng UV-5R provide on +V pin?
What's the pinout for “Kenwood” 2.5mm TRS/3.5 mm TRS connector?How does the baofeng radio eliminate squelch tail?How can I avoid accidentally transmitting with a Baofeng UV-5R?Baofeng low power modCan a Baofeng UV5R receive airport radio transmissions?How to make a PTT button for Baofeng UV-5RCan a Baofeng UV-5R Display Both Name and Frequency Simultaneously?How to make a BaoFeng start/end transmission with soundBaofeng UV 9R Handheld programmingHow do PTT buttons work?Can I use CHIRP for programming a Baofeng DM-5R?
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$begingroup$
I noticed that the pinout for cheap Baofeng connectors has +V available. I'm interested in powering some electronics directly from this connector.
When unloaded, this seems to have about 3.3V on it, but when I try to power my load (an ESP32), the voltage drops to 0.8V.
How much current can this pin actually provide without significant voltage drop? Or, what does the voltage/current curve look like?
baofeng audio-interface
asked May 29 at 17:10
Evan KrallEvan Krall
2211 silver badge4 bronze badges
$endgroup$
add a comment
|
$begingroup$
I noticed that the pinout for cheap Baofeng connectors has +V available. I'm interested in powering some electronics directly from this connector.
When unloaded, this seems to have about 3.3V on it, but when I try to power my load (an ESP32), the voltage drops to 0.8V.
How much current can this pin actually provide without significant voltage drop? Or, what does the voltage/current curve look like?
baofeng audio-interface
asked May 29 at 17:10
Evan KrallEvan Krall
2211 silver badge4 bronze badges
$endgroup$
1
$begingroup$
Have you measured the current draw of your ESP32 to rule out a fault?
$endgroup$
– Phil Frost - W8II
May 29 at 17:42
3
$begingroup$
The voltage is probably meant to bias an electret microphone, so I wouldn't be surprised to hear that that terminal can't source much current.
$endgroup$
– rclocher3
May 29 at 19:48
$begingroup$
3.3v is a common level for logic signals in electronics. This page linked in the other question seems to indicate V+ can be used for PTT 2 - is that not the case?
$endgroup$
– JPhi1618
May 30 at 18:16
add a comment
|
$begingroup$
I noticed that the pinout for cheap Baofeng connectors has +V available. I'm interested in powering some electronics directly from this connector.
When unloaded, this seems to have about 3.3V on it, but when I try to power my load (an ESP32), the voltage drops to 0.8V.
How much current can this pin actually provide without significant voltage drop? Or, what does the voltage/current curve look like?
baofeng audio-interface
asked May 29 at 17:10
Evan KrallEvan Krall
2211 silver badge4 bronze badges
$endgroup$
I noticed that the pinout for cheap Baofeng connectors has +V available. I'm interested in powering some electronics directly from this connector.
When unloaded, this seems to have about 3.3V on it, but when I try to power my load (an ESP32), the voltage drops to 0.8V.
How much current can this pin actually provide without significant voltage drop? Or, what does the voltage/current curve look like?
baofeng audio-interface
baofeng audio-interface
asked May 29 at 17:10
Evan KrallEvan Krall
2211 silver badge4 bronze badges
asked May 29 at 17:10
Evan KrallEvan Krall
2211 silver badge4 bronze badges
asked May 29 at 17:10
Evan KrallEvan Krall
2211 silver badge4 bronze badges
asked May 29 at 17:10
Evan KrallEvan Krall
2211 silver badge4 bronze badges
asked May 29 at 17:10
Evan KrallEvan Krall
2211 silver badge4 bronze badges
2211 silver badge4 bronze badges
1
$begingroup$
Have you measured the current draw of your ESP32 to rule out a fault?
$endgroup$
– Phil Frost - W8II
May 29 at 17:42
3
$begingroup$
The voltage is probably meant to bias an electret microphone, so I wouldn't be surprised to hear that that terminal can't source much current.
$endgroup$
– rclocher3
May 29 at 19:48
$begingroup$
3.3v is a common level for logic signals in electronics. This page linked in the other question seems to indicate V+ can be used for PTT 2 - is that not the case?
$endgroup$
– JPhi1618
May 30 at 18:16
add a comment
|
1
$begingroup$
Have you measured the current draw of your ESP32 to rule out a fault?
$endgroup$
– Phil Frost - W8II
May 29 at 17:42
3
$begingroup$
The voltage is probably meant to bias an electret microphone, so I wouldn't be surprised to hear that that terminal can't source much current.
$endgroup$
– rclocher3
May 29 at 19:48
$begingroup$
3.3v is a common level for logic signals in electronics. This page linked in the other question seems to indicate V+ can be used for PTT 2 - is that not the case?
$endgroup$
– JPhi1618
May 30 at 18:16
1
1
$begingroup$
Have you measured the current draw of your ESP32 to rule out a fault?
$endgroup$
– Phil Frost - W8II
May 29 at 17:42
$begingroup$
Have you measured the current draw of your ESP32 to rule out a fault?
$endgroup$
– Phil Frost - W8II
May 29 at 17:42
3
3
$begingroup$
The voltage is probably meant to bias an electret microphone, so I wouldn't be surprised to hear that that terminal can't source much current.
$endgroup$
– rclocher3
May 29 at 19:48
$begingroup$
The voltage is probably meant to bias an electret microphone, so I wouldn't be surprised to hear that that terminal can't source much current.
$endgroup$
– rclocher3
May 29 at 19:48
$begingroup$
3.3v is a common level for logic signals in electronics. This page linked in the other question seems to indicate V+ can be used for PTT 2 - is that not the case?
$endgroup$
– JPhi1618
May 30 at 18:16
$begingroup$
3.3v is a common level for logic signals in electronics. This page linked in the other question seems to indicate V+ can be used for PTT 2 - is that not the case?
$endgroup$
– JPhi1618
May 30 at 18:16
add a comment
|
2 Answers
2
active
oldest
votes
$begingroup$
I would first measure the current draw of your ESP32 to rule out a fault there.
The +V pin on the Baofeng microphone connection is probably intended to bias an electret microphone. These are essentially a capacitor, with sound pressure changing the spacing between the plates and thus the voltage. They contain a FET buffer since the capacitor could not drive a cable directly. The buffer requires power, but very little: the bias current is probably far less than 1 mA.
Thus it's quite likely the +V pin is unable to supply even a small current. Adding a series resistance on such a pin would have no impact to the intended use of biasing a microphone, but is a cheap and effective way to protect the radio from all kinds of faults that could happen on such a connector.
answered May 29 at 22:01
Phil Frost - W8IIPhil Frost - W8II
32.3k1 gold badge49 silver badges127 bronze badges
$endgroup$
$begingroup$
Almost certainly an electret mic. The only other possibility would be for the PTT; pressing it might feed 3.3 volts back to the main board.
$endgroup$
– Mike Waters♦
May 30 at 15:39
add a comment
|
$begingroup$
- With no load, I measure 3.17V
- With 100kΩ load, 2.91V
- With 10kΩ load, 1.59V
- With 1kΩ load, 0.29V
The math works out to a 10kΩ series resistance between +V and ground.
As such the maximum power that can be drawn is at 1.59V/10kΩ load, or 0.25mW max power. Short circuit current would be about 0.3mA.
edited May 30 at 21:55
rclocher3
3,6381 gold badge6 silver badges26 bronze badges
answered May 30 at 2:55
Evan KrallEvan Krall
2211 silver badge4 bronze badges
$endgroup$
add a comment
|
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
I would first measure the current draw of your ESP32 to rule out a fault there.
The +V pin on the Baofeng microphone connection is probably intended to bias an electret microphone. These are essentially a capacitor, with sound pressure changing the spacing between the plates and thus the voltage. They contain a FET buffer since the capacitor could not drive a cable directly. The buffer requires power, but very little: the bias current is probably far less than 1 mA.
Thus it's quite likely the +V pin is unable to supply even a small current. Adding a series resistance on such a pin would have no impact to the intended use of biasing a microphone, but is a cheap and effective way to protect the radio from all kinds of faults that could happen on such a connector.
answered May 29 at 22:01
Phil Frost - W8IIPhil Frost - W8II
32.3k1 gold badge49 silver badges127 bronze badges
$endgroup$
$begingroup$
Almost certainly an electret mic. The only other possibility would be for the PTT; pressing it might feed 3.3 volts back to the main board.
$endgroup$
– Mike Waters♦
May 30 at 15:39
add a comment
|
$begingroup$
I would first measure the current draw of your ESP32 to rule out a fault there.
The +V pin on the Baofeng microphone connection is probably intended to bias an electret microphone. These are essentially a capacitor, with sound pressure changing the spacing between the plates and thus the voltage. They contain a FET buffer since the capacitor could not drive a cable directly. The buffer requires power, but very little: the bias current is probably far less than 1 mA.
Thus it's quite likely the +V pin is unable to supply even a small current. Adding a series resistance on such a pin would have no impact to the intended use of biasing a microphone, but is a cheap and effective way to protect the radio from all kinds of faults that could happen on such a connector.
answered May 29 at 22:01
Phil Frost - W8IIPhil Frost - W8II
32.3k1 gold badge49 silver badges127 bronze badges
$endgroup$
$begingroup$
Almost certainly an electret mic. The only other possibility would be for the PTT; pressing it might feed 3.3 volts back to the main board.
$endgroup$
– Mike Waters♦
May 30 at 15:39
add a comment
|
$begingroup$
I would first measure the current draw of your ESP32 to rule out a fault there.
The +V pin on the Baofeng microphone connection is probably intended to bias an electret microphone. These are essentially a capacitor, with sound pressure changing the spacing between the plates and thus the voltage. They contain a FET buffer since the capacitor could not drive a cable directly. The buffer requires power, but very little: the bias current is probably far less than 1 mA.
Thus it's quite likely the +V pin is unable to supply even a small current. Adding a series resistance on such a pin would have no impact to the intended use of biasing a microphone, but is a cheap and effective way to protect the radio from all kinds of faults that could happen on such a connector.
answered May 29 at 22:01
Phil Frost - W8IIPhil Frost - W8II
32.3k1 gold badge49 silver badges127 bronze badges
$endgroup$
I would first measure the current draw of your ESP32 to rule out a fault there.
The +V pin on the Baofeng microphone connection is probably intended to bias an electret microphone. These are essentially a capacitor, with sound pressure changing the spacing between the plates and thus the voltage. They contain a FET buffer since the capacitor could not drive a cable directly. The buffer requires power, but very little: the bias current is probably far less than 1 mA.
Thus it's quite likely the +V pin is unable to supply even a small current. Adding a series resistance on such a pin would have no impact to the intended use of biasing a microphone, but is a cheap and effective way to protect the radio from all kinds of faults that could happen on such a connector.
answered May 29 at 22:01
Phil Frost - W8IIPhil Frost - W8II
32.3k1 gold badge49 silver badges127 bronze badges
answered May 29 at 22:01
Phil Frost - W8IIPhil Frost - W8II
32.3k1 gold badge49 silver badges127 bronze badges
answered May 29 at 22:01
Phil Frost - W8IIPhil Frost - W8II
32.3k1 gold badge49 silver badges127 bronze badges
answered May 29 at 22:01
Phil Frost - W8IIPhil Frost - W8II
32.3k1 gold badge49 silver badges127 bronze badges
32.3k1 gold badge49 silver badges127 bronze badges
$begingroup$
Almost certainly an electret mic. The only other possibility would be for the PTT; pressing it might feed 3.3 volts back to the main board.
$endgroup$
– Mike Waters♦
May 30 at 15:39
add a comment
|
$begingroup$
Almost certainly an electret mic. The only other possibility would be for the PTT; pressing it might feed 3.3 volts back to the main board.
$endgroup$
– Mike Waters♦
May 30 at 15:39
$begingroup$
Almost certainly an electret mic. The only other possibility would be for the PTT; pressing it might feed 3.3 volts back to the main board.
$endgroup$
– Mike Waters♦
May 30 at 15:39
$begingroup$
Almost certainly an electret mic. The only other possibility would be for the PTT; pressing it might feed 3.3 volts back to the main board.
$endgroup$
– Mike Waters♦
May 30 at 15:39
add a comment
|
$begingroup$
- With no load, I measure 3.17V
- With 100kΩ load, 2.91V
- With 10kΩ load, 1.59V
- With 1kΩ load, 0.29V
The math works out to a 10kΩ series resistance between +V and ground.
As such the maximum power that can be drawn is at 1.59V/10kΩ load, or 0.25mW max power. Short circuit current would be about 0.3mA.
edited May 30 at 21:55
rclocher3
3,6381 gold badge6 silver badges26 bronze badges
answered May 30 at 2:55
Evan KrallEvan Krall
2211 silver badge4 bronze badges
$endgroup$
add a comment
|
$begingroup$
- With no load, I measure 3.17V
- With 100kΩ load, 2.91V
- With 10kΩ load, 1.59V
- With 1kΩ load, 0.29V
The math works out to a 10kΩ series resistance between +V and ground.
As such the maximum power that can be drawn is at 1.59V/10kΩ load, or 0.25mW max power. Short circuit current would be about 0.3mA.
edited May 30 at 21:55
rclocher3
3,6381 gold badge6 silver badges26 bronze badges
answered May 30 at 2:55
Evan KrallEvan Krall
2211 silver badge4 bronze badges
$endgroup$
add a comment
|
$begingroup$
- With no load, I measure 3.17V
- With 100kΩ load, 2.91V
- With 10kΩ load, 1.59V
- With 1kΩ load, 0.29V
The math works out to a 10kΩ series resistance between +V and ground.
As such the maximum power that can be drawn is at 1.59V/10kΩ load, or 0.25mW max power. Short circuit current would be about 0.3mA.
edited May 30 at 21:55
rclocher3
3,6381 gold badge6 silver badges26 bronze badges
answered May 30 at 2:55
Evan KrallEvan Krall
2211 silver badge4 bronze badges
$endgroup$
- With no load, I measure 3.17V
- With 100kΩ load, 2.91V
- With 10kΩ load, 1.59V
- With 1kΩ load, 0.29V
The math works out to a 10kΩ series resistance between +V and ground.
As such the maximum power that can be drawn is at 1.59V/10kΩ load, or 0.25mW max power. Short circuit current would be about 0.3mA.
edited May 30 at 21:55
rclocher3
3,6381 gold badge6 silver badges26 bronze badges
answered May 30 at 2:55
Evan KrallEvan Krall
2211 silver badge4 bronze badges
edited May 30 at 21:55
rclocher3
3,6381 gold badge6 silver badges26 bronze badges
edited May 30 at 21:55
rclocher3
3,6381 gold badge6 silver badges26 bronze badges
edited May 30 at 21:55
rclocher3
3,6381 gold badge6 silver badges26 bronze badges
3,6381 gold badge6 silver badges26 bronze badges
answered May 30 at 2:55
Evan KrallEvan Krall
2211 silver badge4 bronze badges
answered May 30 at 2:55
Evan KrallEvan Krall
2211 silver badge4 bronze badges
answered May 30 at 2:55
Evan KrallEvan Krall
2211 silver badge4 bronze badges
2211 silver badge4 bronze badges
add a comment
|
add a comment
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1
$begingroup$
Have you measured the current draw of your ESP32 to rule out a fault?
$endgroup$
– Phil Frost - W8II
May 29 at 17:42
3
$begingroup$
The voltage is probably meant to bias an electret microphone, so I wouldn't be surprised to hear that that terminal can't source much current.
$endgroup$
– rclocher3
May 29 at 19:48
$begingroup$
3.3v is a common level for logic signals in electronics. This page linked in the other question seems to indicate V+ can be used for PTT 2 - is that not the case?
$endgroup$
– JPhi1618
May 30 at 18:16