Hi, this is my first thread.
I have the classic chinese DIY circuit Power Supply from ebay / banggood etc.
The problem I have is the same for two boards. If I connect 12v AC everything are working ok. If I connect 24v AC the LED indicator is always ON.
With 24v 3A transformer the Values are:
Illustration 2
A=31.5 V
B=-5.1 V My Zeners are 5,1V
C= 24V
Illustration 4
p1 for Current = 1,6V
p2 for Volts = 10.2V
U1 5.1V 2 and 3 leg
U1 A= 31 V
Zener beside the U1 is 10.35V
Thank you in advance
I have the classic chinese DIY circuit Power Supply from ebay / banggood etc.
The problem I have is the same for two boards. If I connect 12v AC everything are working ok. If I connect 24v AC the LED indicator is always ON.
With 24v 3A transformer the Values are:
Illustration 2
A=31.5 V
B=-5.1 V My Zeners are 5,1V
C= 24V
Illustration 4
p1 for Current = 1,6V
p2 for Volts = 10.2V
U1 5.1V 2 and 3 leg
U1 A= 31 V
Zener beside the U1 is 10.35V
Thank you in advance
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