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Yes Alertlinks right second capacitor serve as backup, but as per UL when any component gets open or short relay should turn off, have a look on attached picture for more information
Yes its possible but circuit gets more complicated i guess, whats your opinion on this?
Greinacher doubler is...
Could you please elaborate more on this idea it looks interesting, could you describe by schematic or falstad script?
I am interested to know about this logic.
Yes its a good logic you have eliminated many components, and its operate very well, what effects happen after eliminating those...
Apologize for late response.
Did you able to solve any of the error which i have mentioned in #121? if yes kindly share updated script with me.
Yes i know its very difficult to satisfy each criteria of UL, UL is asking to shut off the device when any of the components fail.
Yes i am ready to...
Hello Brad,
As i told you in my previous post i have tried to simulate this circuit on TINA simulator but i am not frequent user of this tool so couldnt simulate the circuit.
However, i have made few changes in circuit.
Our main goal is to design a circuit in sucha way that when any of the...
yes for the confirmation and recheck the simulation i am simulating this circuit on TINA simulator (from taxs instrument), in this simulator i am applying diffrent power supply for both op-amp A1 and A2.
Its a free tool you can also download and install it at your end.
Yes parallel capacitor can reduce the relay chattering, but i dont know which value would be suitable, how would i find the value of capacitor?
Latest means which schematic, can you define post no.?
dont be sorry its okay, yes you are right zener idea did not work,component failure also provide...
Brad i have tried 18V DZ3 but still not getting proper result, relay gets toggle when any of the component open.
Please find the attached snap for your reference.
Which circuit currently you consider the 24VDC script which i have attached in Post 110 or our original circuit?
I have check both...
Brad, have look on attached snap, i have changed the value as per your suggestion but relay is not ceonnecting at all, i have changed the following value
R9 330 ohm to 10 ohm
DZ3 16V to 19V
R13 22K to 100K
Relay connects to the the top of C3
Yes i will those approches
One thing i want to clear from you that do i need to freeze the value of R9 from 330 to 10 ohms? or should i move forward with old circuit which has 330 ohms R9.
how ZD3 (if i increase the value)can helps to mitigate the unsafe failures?
As per your knowledge which...
Yes you are right post 106 do not serve the purpose of our goal.
recently i came to know from UL , when any of the component fail relay should deenergize otherwise unwanted connection can turn on the boiler which is not acceptable. so we have to focus in our original circuit.
Do you have any...
Yes sure i will test it and find out threshold voltage
Well i would like to operate the relay 21.6VDC to 26VDC, but relay should not chattering(toggle or blink) because its a unsafe failure, i dont mind if relay gets open or disconnected if any of the component gets short or open
you can...
Brad,
I had played with circuit and i have resolved almost every failure which was happening before, go through the attached falstad scipt file, kindly review it and give your feedback.
but still one problem is , any of this diode D1,D1',D2 and D2' is short at that time relay chattering is...
I am still not getting how i can identify the threshold level of relay? how can i measure the threshold level of relay?
I cant understand your 1 and 2 points which you have mentioned above, can you elaborate on that?
Yes you are right every project has some gotchas, in this project i require...
Well ofcourse threshold voltage would be 24VDC, any how this circuit is operating on 24VDC voltage, so i need to mitigate those unsafe failure? is there any way by mitigate those unsafe failure by changing the values of C1,C2,R7 and R8 or placing those components parallely like instead of just...
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