Aah just perfect. Tomorrow I will test it, I think I have all the resistor, the lm339 and the transistor. The only thing I dunno is the diode.hi Sourc,
For Sim only, as temperature drive source.
E
Aah just perfect. Tomorrow I will test it, I think I have all the resistor, the lm339 and the transistor. The only thing I dunno is the diode.hi Sourc,
For Sim only, as temperature drive source.
E
Ahh nice, I thought that for my circuit, maybe I can get some diode from some board, I have thousand here.hi,
The diode is just to clamp the back EMF created from switching the relay inductive coil Off.
A general purpose diode with a rating greater than 100v and say 100mA will be fine.
E
I will SIM the circuit first, I dont understand some points, I will post the result in a moment.hi,
The diode is just to clamp the back EMF created from switching the relay inductive coil Off.
A general purpose diode with a rating greater than 100v and say 100mA will be fine.
E
Ok, so u need to have the relay in Normally Open mode, so the difference between 20ohm and 60ohm(steam nitrogen) is closed and when there is no nitrogen (60 ohm), its should be activated.hi,
The diode is just to clamp the back EMF created from switching the relay inductive coil Off.
A general purpose diode with a rating greater than 100v and say 100mA will be fine.
E
Well, Im not sure, this is only 1 omh difference and its activated.hi Sourc,
Most relays have change over contacts,
ie: one normally closed and the other normally open.
Change over when energized.
Let me know the result of your simulation.
E
115 its for room temperature aprox no? But steam nitrogen are 60ohm.hi S,
Why have you changed the value of R5 from 115R to 60R...?
E
its should be, 40-70 omh activated, 20-40 omh closed. Aprox. Or use 2 pt100 for 2 levels.hi S,
Why have you changed the value of R5 from 115R to 60R...?
E
can we make the comparator, less sensitive?its should be, 40-70 omh activated, 20-40 omh closed. Aprox. Or use 2 pt100 for 2 levels.
Hi,its should be, 40-70 omh activated, 20-40 omh closed. Aprox. Or use 2 pt100 for 2 levels.
I will replicate tomorrow, I will maybe use other resistance to use with a hot air gun, but that should work.Its ready, 33k ohm fixed that.View attachment 272330
Aaaah I understand now the confusion, when I said 40, I refer to Ohm not to Celsius.Hi S,
The circuit simulation I posted works as you asked.+40C relay ON, less than +40C relay OFF.
I have decreased the hysteresis to about 1C.
Why do you say it didn't work as expected.??
also, why was the 115R changed to 60R.??
E
View attachment 272335
Thanks Eric, is my interpretation bad? when I configure it with 33k ohm.hi S.
OK.
I will redo the simulation and post back shortly.
E
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