AlbertHall
- Joined Jun 4, 2014
- 12,347
Surely the relay will operate with continuous 12v but also when "square waving", which is not what is wantedIn which case this circiut will do the job. You won't need the diode in your circuit - it is just needed in the simulator.
View attachment 243136
I took your previous reply to mean it was OK?Surely the relay will operate with continuous 12v but also when "square waving", which is not what is wanted
Preferably relay on when "square waveing", but OK either way.
A passive type circuit will require large capacitances with difficult to control timing edges. Smaller caps are better but the timing will need to be amplified by a transistor or chip. Perhaps you can relax your restriction on the use of transistors/chips?Surely the relay will operate with continuous 12v but also when "square waving", which is not what is wanted
One relay state for "square waving". The other relay state for 12v on or off.I took your previous reply to mean it was OK?
If it can be on when the input is steady, then just use D2 and C2 from Albert's circuit in post #16.Preferably relay on when "square waveing", but OK either way.
No, if on for square waving, it needs to be off when 12v is continuous.If it can be on when the input is steady, then just use D2 and C2 from Albert's circuit in post #16.
OK.No, if on for square waving, it needs to be off when 12v is continuous.
It can be on when 12v continuous, but then it must be off if square waving
Yes.OK.
Would it be acceptable to use another lower voltage relay to switch the output relay?
On half a second, off half a secondIs the square wave on and off times equal?
Is the on time 0.5 seconds or 1 second?