We get the voltage we need from the network adapter phone. A normal phone charger has 5V, and I will tell you how to make any of these five volts, up to 24 volts.

Entry before 1:49
Calculation of power and current taking into account a 40% discount 1:50
We get 9B 3:21
We get 12V 4:48
Serial connection of boards at 12V 5:58
We get 18V 7:18
Series connection of electrolytes 8:31
We get 24V from the variable resistor from the initial 18V 9:10
Serial connection of 24V boards 9:58
Required zener diodes for 1.5V and 3V 10:40
We get 1.6V from the opposite connection 11:04
We get 3V from the opposite connection 12:38

1.3V Zener Diode:
2S113A
KS113A
D219S
D223S

Zener Diode 2.7V:
1N5223B
BZX79 C2V7
BZX55 C2V7
KS126A
2C127A1
2C127D1

Zener Diode 5.1V:
1N4733A
1N5231B
BZV85C5V1
BZX79 C5V1
BZX55 C5V1

5.6V Zener Diode:
2S156F
1N5232B
BZV85C5V6
BZX79 C5V6
BZX55 C5V6
KS156A
2S156A

7.5V Zener Diode:
2S175A
KS175A
2S175E
KS175E
1N4737A
1N5256B
BZV85C7V5
BZX79 C7V5
BZX55 C7V5

Zener Diodes 8.2V:
BZX55 C8V2 0.5W
BZX85 C8V2 1.3W
BZX79B / C8V2 0.5W
MTZ 8V2C 0.5W
TZX 8V2C 0.5W
KS182A 0.150W
KS126L 0.45W
2S182E 0.150W
KS182E 0.125W
1N4738A 1W
1N5238B 0.5W
D815V 8W
KS482A 1W
2С482А 1W
DL5237B 0.5W
BZY47C8V2 2W

11V Zener Diodes:
BZX79 C11
BZX55 C11
BZV85 C11
KS207B
KS211E
2S211E
KC211I2
DL5241B
BZY47C11
1N5241B
1N4741A
TZX11B
MTZ11B
D814G

16V Zener Diodes:
1N4745N
1N4745A
1N5246B
BZV85C16
BZX79 C16
BZX55 C16

Zener diode for 20V:
1N4747A
1N5250B
1N4841
BZV85C20
BZX79 C20
BZX55 C20
KS520V