有在dx10上改过耳咪的没？现在遇到个问题，耳机只有4芯线，除了phone输出两根，mic有mic+ mic gnd，由于改造耳机电路特殊性，需要给mic+ 一个3-5v电压， ![这样会不会对电台有影响？我测试ptt时，mic+是低电平，如果改装后相当于mic+始终有+5v，有经验的火腿们讨论下。 [upl-image-preview uuid=2c58e6a9-d5d2-4c0b-9ea1-54d7ec482a30 url=https://storage.hamcq.cn/2025-09-15/1757904129-365469-1.png alt={TEXT?}] [upl-image-preview uuid=37b5ded7-a4f0-4205-a275-519d37051989 url=https://storage.hamcq.cn/2025-09-15/1757904330-822534-2.png alt={TEXT?}] 目前耳机四线连接线序： spk+ 连接电台phone接口 spk- 连接电台phone接口 mic+ 连接电台5v和电台mic+ mic gnd 连接电台 mic gnd ptt 按钮连接电台ptt gnd 连接电台gnd

没看明白有什么疑问？是纠结MIC+有+5V电压吗？这个电压是给驻极体咪头用的。

@"BD6OC"#p78883 对的纠结这个mic+ 5v电压问题，相当于yaesu机器里 mic+和 vcc 5v 短接了，不知道是否有风险，我还在查看电路图没找见这块逻辑

举个和你差不多的例子，之前给老船台做盒子，机器没ACC口音频走的手咪口，用的cm108声卡，好好看了下这声卡的datasheet mic会给一个驻极体的偏置电压，就是你说的这种情况，加个0.1u隔直电容隔一下就可以

电台手咪口这里的5v本意上就是给驻极体偏置供电用的，icom一般是8v，如果用动圈话咪的话这个供电就用不到，这个千万不能短路，在隔壁论坛见过因为这个短路烧机器的

串联电容方法是可以解决串电流进到mic+，但是串联后耳机mic喊出去声音很微弱，分别用了1uf 2uf 400nf 1nf，手头只有这么多可用的电容，mic声音均微弱

@"BI1RRE"#p78954 🤔那有点麻烦了感觉

@"BI1RRE"#p78943 那就要加话放了，你麦克推不动

Problems with modifying YAESU DX10 headphones and microphone.

BI1RRE

Has anyone modified headphones for use with DX10? I'm currently having an issue. My headphones only have a 4-core cable, with two lines for phone output and one line for the microphone (labeled "mic+" and "mic gnd"). Due to the specific modifications required for the headphone circuit, I need to provide the "mic+" line with a voltage of 3-5V. Will this affect the radio? When I'm using PTT (push-to-talk), the "mic+" line has a low voltage. If I modify it, it will always have +5V. Experienced ham operators, please discuss.

Current headphone cable connection order:
spk+ connection for radio phone interface
spk - Radio connection interface
mic+ connects to radio's 5V and radio's mic+
microphone ground connection to radio microphone ground
PTT button connects to radio PTT
Ground connection for radio gnd

BD6OC

Do you have any questions that you don't understand?

Is it a question of whether the MIC has a 5V voltage?

This voltage is for use with the polar microphone element.

BI1RRE

BD6OC Yes, I'm struggling with the issue of connecting this microphone + 5V voltage. It seems like I've short-circuited the microphone + and VCC 5V lines in my Yaesu radio. I'm not sure if this is safe, and I haven't found any information about this in the circuit diagram.

BD6OC

BI1RRE
I still don't quite understand what your concern is. Shouldn't I just be able to plug in the microphone normally? What are you worried about?

It's normal for MIC+ to have voltage; this voltage provides a bias voltage to the microphone capsule.

As BI4KSR stated, YAESU requires 5V, while ICOM requires 8V.

BI1RRE

The series capacitor method can prevent current from entering the mic+, but after connecting in series, the sound output from the headphones and microphone is very weak. I tried using capacitors of 1uF, 2uF, 400nF, and 1nF, but I only have these available. The sound from all the microphones is weak.

BH6AOV

Shall I try adding a diode?

BI1RRE

BH6AOV It didn't work.

BH6AOV

BI1RRE 🤔That seems a bit complicated.

BI1RRE

Anonymous8 The built-in microphone on my device doesn't seem to be working properly, and adjusting the gain settings hasn't made a difference. The sound is still very quiet. I'm going to look into the circuit board to see if there's anything wrong. Thanks.🙏

BI1RRE

This is the circuit diagram for the FT710 microphone, and the DX10 should be similar. As you can see from the diagram, this microphone already has filtering and common-mode rejection capacitors built in. Does this mean that there's no need to worry about 5V leaking into the microphone?
@Anonymous8
@BH6AOV

BH6AOV

I don't know what happens after the capacitor is charged.🤔, I think it should be possible, etc. KSR teacher's opinion

BD6OC

https://zhuanlan.zhihu.com/p/515379352
https://blog.csdn.net/xuhao0258/article/details/112255185
For an introduction to polarized microphone technology, you can read this article and understand the purpose of using a fixed voltage.

BI1RRE

BD6OC
Thank you, BD6OC, for your reply. I understand that I need a bias voltage. My current headset only has a 4-pin connector, and as mentioned above, when connecting it to the DX10 RJ45 port, I need to connect the DX10's VCC and mic+ together with the microphone's mic+. The headset itself has a built-in microphone and noise reduction circuit. Here is an image of the wiring: In the diagram, the VCC and mic+ coming from the DX10 RJ45 port are connected together. This provides 5V power to the microphone inside the DX10 machine. I am asking if this power supply will affect the machine.

BH7HCU

~~Leave a mark, just in case I buy an DX10 one day.🤭~~~~~

BD6OC

I've carefully reviewed what you said and I think I understand your meaning to be approximately this:

The headset interface has only 4 cables.

The headset requires a separate power supply to function.

The headphones use 2 wires.

The microphone uses two wires.

This resulted in a lack of spare power lines.

Is this what you mean?

There are two more questions:

1. What is the VCC voltage you are referring to for the DX10? Is it 13.8V?

2. What voltage does the microphone require? Is the 5V provided by MIC+ sufficient?

BI1RRE

BD6OC The internal power supply for the earphones and the mic+ at the headphone jack are designed to be combined into a single mic+ cable, which carries both the power supply for the mic+ and the noise-canceling amplifier chip inside the headphones.
dx10 RJ45 VCC+ output is +5V;
The internal chip of the headset requires a power supply of 5-16V.

BD6OC

DX10 Front Panel Handshake Interface Definition

BI1RRE

Anonymous8 Okay, thank you, ksr.

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