High power series regulated power supply

Series regulated power supply experimental power supply:
independent features and functions +5V, +12V, +3.3V can be fixed or adjustable. The test output current condition is 1A, which can be exceeded, but it is not recommended because the heat generation is high and heat dissipation is required. Can be broken through.
Fixed voltage regulator chip: ±9V, -15V, -5V, LM317-LM337 reference voltage is adjustable, the output voltage can be changed, it can be achieved by changing the resistor through the data sheet, it has been tested to have good load regulation rate, and a capacitor needs to be connected , the capacitor is not soldered in the picture because the capacitor of this model is used up. I soldered the 220uf electrolytic capacitor on the back. It must be soldered. 10uf and 220uf, 220 has the best load adjustment rate. It is recommended to connect it in parallel later for the best effect.
 
Notes: 1. Note that the input voltage withstand voltage capacitor is 25V. If you have 35V, replace it with 35V. After all, if you sell a dual 15V transformer, they will always give you a few more volts. If the thing blows up, it will not be finished. You have to calculate, U= 1.414U2, be on the safe side. If you use 17V, you will be close to the Chinese New Year. Fired off.
 
2. C1, C12 and C31 capacitors are not soldered.
3. Replace LM293 with LM358      
4. The voltage regulator tube TVS is not welded. If you need to adjust the other channel urgently, there is a voltage regulator that cannot be adjusted higher than
5. There is a small probability of BUG. It appears in the +5V+12V+3.3V line. There will be one channel. There was suddenly no voltage, so I asked not to weld the voltage regulator tube, and there were alternatives that could be adjusted. This bizarre incident was caused by my juniors. I don’t know what they did. I have never encountered it. I guess it's a short circuit. The cause of this bizarre incident is unknown and has not been discovered after replacing LM358. However, the specific reliability is unknown and the test time is relatively short. There is no discovery yet. If LM293 is used, a voltage regulator tube must be used and the capacitor needs to be replaced because the response is slow. It will produce a voltage higher than 1V and then return to normal, so I recommend using LM358 and not soldering the capacitor and voltage regulator tube.
(1) There will not be a voltage problem higher than 1V, and the voltage regulator tube can be dispensed with.
(2) The previous voltage is no longer limited and can be adjusted freely.
6. Other precautions: None.
 
 
This power supply has also been used in a competition. In 2022, the power supply used in the sound source identification device is this power module. This power supply can be regarded as having been on the battlefield, and won the first prize of Zhejiang Province in the TI” Cup National College Student Electronic Design Competition. point