Would a zero cross transformerless circuit work to prevent the initial inrush current by not allowing turn on until the 0 point in the 60/50 hertz cycle? Many solid state relays which are cheap, less then INR 10.00 and have this ability built in them.
Also I would like to drive 20watt leds with this design but am unsure how much current or how hot capacitors will get I suppose it depends on how the leds are wired series or parallel, but lets say the capacitor is sized for 5 amps or 125uf will the capacitor heat up and blow??? How does one read capacitor specs to determine how much energy they can dissipate.
The above potential is also applied to the base Q1 via the 100k resistor.
The IC 555 is configured as an monostable MV which means its output will go high every time its pin#2 is grounded.
For the periods during which the AC mains is above (+)0.6V, Q1 stays switched OFF, but as soon as the AC waveform touches the zero mark, that is reaches below the (+)0.6 V, Q1 switches ON grounding pin#2 of the IC and rendering a positive output of the IC pin#3.
The output of the IC switches ON the SCR and the load and keeps it switched ON until the MMV timing elapses, to begin a new cycle.
The ON time of the monostable can be set by varying the 1M preset.
Greater ON time ensures more current to the load, making it brighter if it's an LED, and vice versa.
The switch ON conditions of this circuit is thus restricted only when the AC is near zero, which in turn ensures no surge voltage each time the load or the circuit is switched ON.