adrianbodor
Member
I read a lot about this circuit, for many of you probably is a simple circuit but i want to use for a simple LED indicator to a socket outlet, which means it will stay continuously lit for a long period of time. I want to use a capacitor class X2 to eliminate the heat in case of use a resistor and with 10mA is enough for this purpose.
I saw many variants of this circuit on a polish forum
https://obrazki.elektroda.net/49_1202304608.png
**broken link removed**
https://obrazki.elektroda.net/85_1187423053.gif
Now, I understand that capacitor limits the current to the LED with a value of 150nF which gives about 10mA. the bleeding resistor across the cap discharge it when power is out. The resistor R2 1K serves to limit the current stroke when you turn. Bridge rectifier is obviously what it does. The elko limits the strobe effect to the LED. Till now I understood quite well.
What I don't know is the use of the zener i the other circuits. I saw a description of this, it protect the circuit in case of LED failure
I want to design an almost perfect circuit taking into consideration a LED failure because it happens after continuous use, CAP failure, etc. I don't want the circuit to became a firework when some components fail to operate due to long use.
I accept any kind of suggestions to make this circuit better.
I saw many variants of this circuit on a polish forum
https://obrazki.elektroda.net/49_1202304608.png
**broken link removed**
https://obrazki.elektroda.net/85_1187423053.gif
Now, I understand that capacitor limits the current to the LED with a value of 150nF which gives about 10mA. the bleeding resistor across the cap discharge it when power is out. The resistor R2 1K serves to limit the current stroke when you turn. Bridge rectifier is obviously what it does. The elko limits the strobe effect to the LED. Till now I understood quite well.
What I don't know is the use of the zener i the other circuits. I saw a description of this, it protect the circuit in case of LED failure
I want to design an almost perfect circuit taking into consideration a LED failure because it happens after continuous use, CAP failure, etc. I don't want the circuit to became a firework when some components fail to operate due to long use.
I accept any kind of suggestions to make this circuit better.
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