LM317+LM337 headphone amplifier power board (onboard transformer and EMI circuit)

After finishing the college entrance examination, I had nothing to do, so I started to build a Lyman headphone amplifier. During the production process, I found that many off-the-shelf power supply boards were either too big to fit into the chassis, or the functions were too single to meet the needs. Since they all I built my own amplifier board, so why not build my own power supply? So I went through many small modifications and two major modifications to get this board out. This is already version 2.0. The last version was overturned, but I also posted the ideas of the last version in the circuit diagram. Multiple Voltage stabilization is really easy to overturn. Don’t play with multiple voltage stabilizations if you are not sure!
The amplification board needs to be modified before I can see you. Although it can be used, it is a mess. I can't bear to look at it.
It adopts the classic and reliable LM317+LM337 million gold solution, a compact size of 10cm*10cm (100mm*100mm), and an onboard transformer and EMI. Compared with most voltage stabilizing boards on the market,
the following is a comparison of finished boards on the market
. But its disadvantage is that you have to make your own heat sink. If you are not willing to buy a can of Feizhai Happy Water, you will be too lazy/not to know how to cut aluminum after drinking it. If you can make your own heat sink, please avoid this solution and it is strictly required that the power socket integrates a fuse box (not a disadvantage, because many audio equipment jacks basically have fuse boxes). The main filter capacitor is recommended to be 35V10000uF, and welded with
a 10mm pitch.
Be sure to read the silk screen prompts before printing!
Be sure to read the silk screen prompts before welding!
Be sure to read the silk screen prompts before welding!
The rectifier bridge is KBU1010. If not, you can use the pin-breaking method to install GBJ2510 or something. This is what I did (doge).
The following is a physical display.
If the power socket is close to the components, please wrap it with electrical tape for
220V input. It is recommended to use plug-in terminals for dual power output to facilitate circuit debugging.