Temperature Controller POSITIVE POWER 10MFD THERMIS

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Temperature Controller POSITIVE POWER 10MFD THERMIS

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Temperature Controller
POSITIVE POWER
10MFD
THERMIS
POSI
TIVE
PPLY
2N3904 ical
MISTO THER
2N39
typi
COMM
CLOS OPEN
OP-14
OP-14
NORM
NORM
ITIVE
POLECT VALU
COMMON
NEGATIV
POWER
NORM NORM
SUPPLY
VALU SELE
1N40
1N4001
RELAY
10MF
NEGA
TIVE
PPLY
THER
MIST
R4ELEC
ITIV
RMIS
OP-1
typic
OP-1
NEGMF ATIV
SELE
2N39
pical
LECT
COMM
1N40
ATIV
NORM NORM
CLOS OPEN
RELA
QUALITY THERMISTOR, INC. 2108 CENTURY BOISE, 83709 1-800-554-4784
www.thermistor.com
POSITIVE POWER SUPPLY
works!
10MFD
THERMISTOR
Temperature Controller
SELECT VALUE
OP-14
2N3904 typical COMMON
NORM CLOSED NORM OPEN
Resistors form voltage divider, presenting power supply voltage positive input operational amplifier. thermistor resistor form another voltage divider, negative input amplifier. exact value this divider depends resistance thermistor, which varies with temperature. this way, voltage negative input operational amplifier varies, amplifier changes output depending which inputs more positive.
1N4001 RELAY SPDT
NEGATIVE POWER SUPPLY
ohms. Choosing would very close proper value. Using resistor/potentiometer combination would allow adjust voltage divider exactly degrees. results this effort would that relay would energized temperature were low. were trying heat, would choose COMMON NORMALLY OPEN terminal relay turn heater. were trying cool, would choose COMMON NORMALLY CLOSED terminals. have added transistor output amplifier, since amplifier itself cannot generate enough current close relay. transistor amplifies current amplifier, delivers relay.
temperature low, thermistor resistance high, voltage negative input terminal lower than positive input. operational amplifier amplifies this difference forces operational amplifier output high, turning relay.
POSITIVE POWER SUPPLY
math oriented. value should selected equal thermistor resistance temperature output voltage divider equal controlled. Looking Quality Thermistor Vout R1/(R1+R2) page HYPERLINK "http://www.thermistor.com" thermistor 10MFD THERMISTOR www.thermistor.com) select thermis- Vout Rthermistor/(Rthermistor+R2) tor. Looking curve that degrees Fahrenheit resistance 34,903 2N3904 typical
PARTS LIST
SELECT VALUE
OP-14
COMMON
NORM CLOSED NORM OPEN
NAME
DESIGNATOR
PART NUMBER
VENDOR NUMBER
Operational Amplifier Resistor NEGATIVE POWER SUPPLY Resistor Transistor Diode 8PinSocket Board Relay Capacitor
R1,R2 none none
M741CN 47Kohms 1Megohm 2N3904 none none none
276-007 1N4001 271-1342 271-1356 276-2016 4001276-1101 276-1995 276-150 275-217
RELAY SPDT
ALTERNATE PARTS
NAME PART NUMBER VENDOR NUMBER
Potentiometer
100Kohm trimmer 10Kohm trimmer 1Kohm trimmer
271-284 271-282 271-280
QUALITY THERMISTOR, INC. 2108 CENTURY BOISE, 83709 1-800-554-4784
www.thermistor.com
Temperature Controller
Parts Diagram Important Notes
POSITIVE POWER SUPPLY
10MFD
THERMISTOR
2N3904 typical COMMON
SELECT VALUE
OP-14
NORM CLOSED NORM OPEN
1N4001
NEGATIVE POWER SUPPLY
RELAY SPDT
NOTES:
should equal value. thermistor selected. equal value thermistor resistance control temperature selected. Select power supply such 'wall supply' equal relay voltage. have volt relay volt) select volt supply volt). exceed volts! resistors potentiometer dashed lines substitute would like variable temperature control. Select potentiometer equal wide range control, smaller value (5K) narrow range. relay will energized when thermistor resistance higher (temperature lower) than point resistor (R4). relay COMMON wire relay NORMALLY OPEN wire energize your heater. COMMON NORMALLY CLOSED energize your cooler. sure select relay whose contacts able handle voltage amperage heater/cooler assembly. transistor, such 2N3904. operational amplifier such LM741CN. added eliminate relay 'chatter'. will determine difference between temperatures controller. Make larger value smaller differences control.
QUALITY THERMISTOR, INC. 2108 CENTURY BOISE, 83709 1-800-554-4784

Temperature Controller POSITIVE POWER 10MFD THERMIS

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