Questions on Automatic Staircase Light

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spidermanIIII

Joined Nov 22, 2013
78
hi, i searched for this project and i found this schematic i have some questions about it what if i remove R1 what will happen i afraid to remove it because i deal with 220 volt , second i tried to do simulation for this circuit but there is error can anyone help me with simulation
 

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Ramussons

Joined May 3, 2013
1,404
the IC 555 acts as a mono stable and derives its 8.2 Volts power from the 220 V mains. R1 is the voltage dropping resistor which limits the Zener current to about 22 mA.
If R1 is Removed, the circuit will not work.
If you bypass R1, the minimum you can expect is a blown Fuse, D1, D2 and maybe an exploded C1.
 

BillB3857

Joined Feb 28, 2009
2,570
I'm surprised this thread is not closed since it is line operated without isolation. The OP is properly afraid when playing with line voltages. Even those with experience respect it.
 

Wendy

Joined Mar 24, 2008
23,415
We close them as we see them.

This thread is against the AAC forum rules, Chapter 6, as seen here:

6. Restricted topics. The following topics are regularly raised however are considered “off-topic” at all times and will results in Your thread being closed without question:

  • Any kind of over-unity devices and systems
  • Automotive modifications
  • Devices designed to electrocute or shock another person
  • LEDs to mains
  • Phone jammers
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  • Transformer-less power supplies
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