vlbaby
Beer Budda
- Joined
- 21/9/04
- Messages
- 560
- Reaction score
- 0
recharge,
I think your problem is not hystersis. The circuit has clearly had a set level of hysteresis designed into it already ie 33k resistor.
I think you'll find that the fridge itself, being an inductive load, is causing a power supply spike that is reflecting into the mains and into your little circuit. One easy way of confirming this would be to connect the circuit to a simple incandescent light bulb. The light bulb is a resistive load and wont induce any spikes at all.
Try heating up the sensor slowing and see if your light bulb flutters as it switches on, my bet is it wont.
If i'm right, then the only way to stop this is either fit a supressor to the fridge, or better line filtration to your circuit.
My own temperature controller i built suffers a similar problem of which i am to fix one day. My march pump starting is enough to set mine off crazy.
hope this doesnt confuse things more <_<
I think your problem is not hystersis. The circuit has clearly had a set level of hysteresis designed into it already ie 33k resistor.
I think you'll find that the fridge itself, being an inductive load, is causing a power supply spike that is reflecting into the mains and into your little circuit. One easy way of confirming this would be to connect the circuit to a simple incandescent light bulb. The light bulb is a resistive load and wont induce any spikes at all.
Try heating up the sensor slowing and see if your light bulb flutters as it switches on, my bet is it wont.
If i'm right, then the only way to stop this is either fit a supressor to the fridge, or better line filtration to your circuit.
My own temperature controller i built suffers a similar problem of which i am to fix one day. My march pump starting is enough to set mine off crazy.
hope this doesnt confuse things more <_<