Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!
Voltage Controlled Resistor
- Thread starter sean0506
- Start date
cbarn24050
Industrial
Hi, you can use a fet as a variable resistance but its resistance changes with the drain source voltage as well as the gate source voltage.You could try using a cds photo detector but you will not get down to 0 ohms.
- Thread starter
- #6
The aplication is to replace the thermostat.
Simulate the circuit to act as thermostat, and for the sensor to read resitance of circuit(in replace of thermostat). The resitance of thermostat goes higher as the temperature goes down. The sensor reads resistance of thermostat as it varies and gives out its temperature reading.
Control voltage is varied from 0 to 15vdc and in return should produce variable resistance.
I know it won't output exact 0 ohms. it should produce 3k ohms-1M ohms versus 15VDC-0VDC or 28vdc - 0vdc.
Have anyone used Phillips Semiconductors N-channel field-effect transistor(PMBF4416)?
Simulate the circuit to act as thermostat, and for the sensor to read resitance of circuit(in replace of thermostat). The resitance of thermostat goes higher as the temperature goes down. The sensor reads resistance of thermostat as it varies and gives out its temperature reading.
Control voltage is varied from 0 to 15vdc and in return should produce variable resistance.
I know it won't output exact 0 ohms. it should produce 3k ohms-1M ohms versus 15VDC-0VDC or 28vdc - 0vdc.
Have anyone used Phillips Semiconductors N-channel field-effect transistor(PMBF4416)?
- Status
Similar threads
- Locked
- Question
- Locked
- Locked
- Question
- Locked
- Question