[Announcement attached] Optical audio 4-in-1-out switcher splitter

Announcement
Thank you for your long-term support of __Aknice!
From today on, unless there are special circumstances, the projects I make will use 0402 packaged resistor and capacitor devices (unless I am lazy), and the projects will be made in small sizes (depending on the development board).
Since 0402 material is used, some students may use SMT, so when I draw the schematic diagram, I will search for components from Lichuang Mall and put them in. The components will correspond.
In the past, my method was to randomly pick up a 0603 resistor, such as 499 ohms, and then modify the 499 value. However, the mall material number and other parameters remained unchanged. As a result, some students who were working on my project reported that they could not run SMT when they saw the resistance. All posted for 499 euros: (
Subsequent projects will correspond one by one, so the BOM generated in this way is correct. There are still some projects on hand that have not been released. These projects may use 0603 or 0402. Please pay attention to them. .
Many students who have followed me in engineering have watched me use the 0603 package from 0805 to the current 0603 package. I have never used the 0402 package.
At present, my 0402 material inventory has been completed, and this project is regarded as 0402. For the first project, everyone also needs to improve their welding skills as soon as possible!
 
__Aknice Sincerely
2023.05.22
1. Introduction to
the optical fiber audio 4-in and 1-out switch/splitter
function: input 4 different audio signals, which can come from disc players and computers. , sound cards, game consoles and other devices, by selecting one of the output channels to the audio, decoding equipment, power amplifier, etc. Application: When there is only one audio or playback device, and there are many input devices, it will be inconvenient to plug and unplug the optical fiber cable frequently. This product can quickly switch between different input devices without frequent plugging and unplugging. Principle: See
similar products in Chapter 2 below. Although I don’t know what solutions are available on the market, there are also hard physical switches.
2. The circuit
uses CH444G as the switching chip. 74HC139 is used as a logic indication chip. The block diagram is as follows
: the oscilloscope fiber output diagram:
It doesn’t matter if there is no 10nF capacitor here, you can stick 0 ohm3
. The shell
is drawn using SOLIDWORKS.
See the attachment
. You can place an order directly.
In addition, only two openings will be uneven, but Choose foot pads
https://item.taobao.com/item.htm?spm=a1z09.2.0.0.74a22e8d4oZGAU&id=622354920399&_u=mqavhl8cefb
Screws:
M3X6+6: 2 pieces
M3X14+3: 2 pieces
M3 copper hexagonal nuts: 2 pieces
Cross thin-head machine wire M3x6: 2 pcs.
Acrylic thickness: 2mm.
Plate thickness: 1.6mm.
4. Summarize
the project recommendation level: Hardware beginners.
Project cost: Mainly because the optical fiber receiver is more expensive, 2.9 yuan each, and one switch uses 4. , the total cost of the hardware does not exceed 15 yuan, and the casing is 15 yuan with free shipping.
The fiber optic socket is too expensive to buy at LCSC. Ma Yun.com provides guidance on the fiber optic socket:
https://item.taobao.com/item.htm?spm= . a1z09.2.0.0.74a22e8dZCqLTV&id=611704475199&_u=mqavhl87f22
is implemented in pure hardware circuit. It is small in size and provides a shell. It can be a training project for beginners.