)Transient-voltage-suppression diode vs SIDAC

Thread Starter

minh

Joined Nov 24, 2010
24
Dear all
Please help me to know what is different:
Transient-voltage-suppression diode and Sidac ???
Can I use P6KE120ca (TVS) replacementMK1V125 =K1200 (Sidac) in this circuit. please see photo .Thank you so much.

 

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alfacliff

Joined Dec 13, 2013
2,449
the tvs is essentially a high current zener. there is no action like a diac with a zener. the diac or sidac has a diferent voltage for conducting and turning off, that makes it oscilate. the zener just goes to a voltage and conducts.
 

Sensacell

Joined Jun 19, 2012
2,430
The SIDAC will breakdown and conduct heavily until a much lower voltage / current threshold is reached.

Kind of like 'snap-action'
 

alfacliff

Joined Dec 13, 2013
2,449
but thats not what it takes to oscilate, there has to be a difference between turn on and turn off, kind of liie a neon bulb, turns on at a higher voltage than it turns off as in "relaxation oscilator".
 

Thread Starter

minh

Joined Nov 24, 2010
24
Dear alfacliff and Sensacell
Thank you so much for your time helpful me.
Kind regards
minh
 

Sensacell

Joined Jun 19, 2012
2,430
but thats not what it takes to oscilate, there has to be a difference between turn on and turn off, kind of liie a neon bulb, turns on at a higher voltage than it turns off as in "relaxation oscilator".
I think it's properties are very similar to a neon lamp, the OP's circuit is a relaxation oscillator, it's a repeating strobe light circuit.
 
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