R
Radim S
- Jan 1, 1970
- 0
Hi,
I have following problem . The Thermopile probe ( 0.5V output @ 600 Deg C
with internal resistance 2 Ohms ) drives gas valve solenoid with very low
resistance ( approx. 0.023Ohm ) . Approximate holding current is 250mA .
So there is only about 5mV on solenoid . I need to cut off this circuit
with some kind of FEt , MOSFET or opto MOSFET . External circut to control
this switch can have common ground with above circuit. Cannot use relay -
external circuit does not have enought current to drive relay. I see
problem with relativly low switched voltage ( only 0.5V ) and low
resistance of fet needed .
Any ideas what could be good solution ?
Thanks Radim.
I have following problem . The Thermopile probe ( 0.5V output @ 600 Deg C
with internal resistance 2 Ohms ) drives gas valve solenoid with very low
resistance ( approx. 0.023Ohm ) . Approximate holding current is 250mA .
So there is only about 5mV on solenoid . I need to cut off this circuit
with some kind of FEt , MOSFET or opto MOSFET . External circut to control
this switch can have common ground with above circuit. Cannot use relay -
external circuit does not have enought current to drive relay. I see
problem with relativly low switched voltage ( only 0.5V ) and low
resistance of fet needed .
Any ideas what could be good solution ?
Thanks Radim.
