I want to make a circuit to transmit audio signals on DC18V. Does anyone have any good circuits to refer to?

youzizhile

I want to make a circuit to transmit audio signals on DC18V. Does anyone have any good circuits to refer to? [Copy link]

 

I want to make a circuit to transmit audio signals on DC18V. Does anyone have any good circuits to refer to?

PowerAnts

Reference Phone

maychang

See wired telephone.

wudianjun2001

I used to work on voice intercom in my previous company. I loaded audio on 24V DC power.

懒猫爱飞

This can only refer to the telephone. When I was in college, I saw a book on circuit design application written by a foreigner, which introduced this aspect. Unfortunately, I forgot the title of the book

youzizhile

wudianjun2001 posted on 2019-3-4 08:39 I have done audio loading on 24V DC power for voice intercom in my previous company

Is there any reference material? Please help, thank you. My email address is youzizhile@163.com

youzizhile

PowerAnts posted on 2019-3-3 22:27 Reference phone

The phone is too complicated. I am analyzing the circuit and simulating it with multisim.

youzizhile

maychang posted on 2019-3-4 07:53 Refer to the wired telephone.

The telephone is too complicated. I am analyzing the circuit and simulating it with multisim.

youzizhile

Lazy Cat Loves Flying published on 2019-3-4 09:07 This can only refer to the telephone. When I was in college, I saw a circuit design application written by a foreigner. There is an introduction to this aspect. Unfortunately, I forgot the title of the book: titte ...

The telephone is too complicated. I am analyzing the circuit and simulating it with multisim

maychang

youzizhile posted on 2019-3-4 23:21 The telephone is too complicated. I am analyzing the circuit and simulating it with multisim

The circuit inside the telephone is not only capable of passing DC and talking on the phone at the same time. There are also circuits for picking up the phone, ringing, etc. Remove the circuits with other functions, and the circuit is the circuit that passes DC and talking on the phone at the same time. The principle is: the inductive reactance of the inductor increases with the increase of frequency, and the capacitive reactance of the capacitor decreases with the increase of frequency.

PowerAnts

maychang posted on 2019-3-5 08:13 The circuit inside the telephone not only passes direct current and voice current at the same time. It also has functions such as picking up the phone, ringing, etc. The circuits of other functions...

LC frequency division has been used for a long time. This is the blueprint of the radio telephone that I repaired for more than a month when I first came out in 1996

youzizhile

PowerAnts posted on 2019-3-5 22:10 LC frequency division has not been used for a long time. This is the blueprint I used to repair radios and telephones for more than a month when I just started working in 1996

Thanks for sharing

masterliu

You are talking about the 18V+22K circuit, which is used in set-top boxes; there are special circuits for this kind of thing.

youzizhile

masterliu posted on 2019-3-7 13:34 You are talking about the 18V+22K circuit, which is used in set-top boxes; there are special circuits for this kind of thing.

I have analyzed the original circuit, which is a DC signal directly loaded by the audio without modulation