Remove Q3 and read the voltage on the output of the opto isolator without and with pressing the 230 volt button using the 1K resistor.

 

Remove Q3 and read the voltage on the output of the opto isolator without and with pressing the 230 volt button using the 1K resistor.

No difference. In both occasions the voltage is almost 0v. Second photo was taken while the 230v button was pressed.

 

Here we go again! From a closer look at the opto isolator it switches low when activated not High which explains the 3.25 volts on the output when the button is not pressed. Hang in there a moment while I figure the work around. Do you have another 2N7000?

 

Here we go again! From a closer look at the opto isolator it switches low when activated not High which explains the 3.25 volts on the output when the button is not pressed. Hang in there a moment while I figure the work around. Do you have another 2N7000?

Yes. I have another 2 actually.

 

Add Q4 and R4.

 

Add Q4 and R4.
View attachment 298975

Everything works perfectly. Video.
Thank you so much @sghioto for your immense support and bearing with my stupid mistakes. Also thank you everyone who contributed this lengthy thread including @BobTPH.

Before closing the thread, can anyone help me in designing a good PCB design for this?

 

Are you having the pc board made for you?

 

Yes. I’m having a plain PCB with me and I can imprint the wire pattern with FeCl3 if I have a PCB design.

 

Meaning you are going to etch your own board?

 

Are you having the pc board made for you?

@sghioto I noticed that once I power up the system the 230v bulb is lighted for around 2 sec by activating the relay even without pressuring any buttons. Similarly the video doorbell fires without pressing buttons just after I cut the power supply to the system. Video.
I doubted that was happening because of the discharging capacitor. I tested the system without the capacitor and that solved the issue. But when the capacitor is not there I doubt my old 230v doorbell will ring correctly as it makes very brief activations in the relay. Is there any workaround for this while keeping the effect of the capacitor?
Im thinking about this as it may misfire the bells in power failures.

 

Meaning you are going to etch our own board?

Exactly. That’s the word I was looking for.

 

Is there any workaround for this while keeping the effect of the capacitor?

Sure. Will look into it shortly.

 

Can you follow a regular schematic?
I'm getting tired of "painting" these circuits out.

 

Can you follow a regular schematic?
I'm getting tired of "painting" these circuits out.

Yes. That’s fine. I can follow.

 

Latest version to eliminate ring on power up and down, not verified.

 

Latest version to eliminate ring on power up and down, not verified.
View attachment 299034

Shall I use the 1N4148 diode we used previously for D1 here?
And for C1 and C2, shall I use 16V capasitors?

 

Yes to both questions.

 

Yes to both questions.

Latest version to eliminate ring on power up and down, not verified.
View attachment 299034

This works perfect. @sghioto thank you heaps, once again.
Sorry for the delay in testing the diagram. I had to buy both capacitors and 1M resistors.

 

This works perfect. @sghioto thank you heaps, once again.
Sorry for the delay in testing the diagram. I had to buy both capacitors and 1M resistors.

@sghioto could you please help me with a PCB design as well?

 

I can but there is plenty of free software on line you can use.