I’ve been fascinated by the LM335 for some time -maybe my obsession with stability finally gave way to my fascination with a circuit with intentional thermal drift. I finally bought some the other day, and to check one out, I hooked it up as a thermometer, based the National Semiconductor application note.
Read more : Simple [...]
Transmitter circuit diagram:
Transmitter parts:
R1,R3________100K 1/4W Resistors
R2___________47R 1/4W Resistor
R4____________5K 1/2W Trimmer Cermet
R5___________12K 1/4W Resistor
R6___________10K 1/4W Resistor
R7____________6K8 1/4W Resistor
R8,R9_________1K 1/4W Resistors
C1___________220nF 63V Polyester Capacitor
C2____________10nF 63V Polyester Capacitor
C3_____________1µF 63V Polyester Capacitor
C4,C6__________1nF 63V Polyester Capacitors
C5_____________2n2 63V Polyester Capacitor
C7,C8_________47nF 400V Polyester Capacitors
C9__________1000µF [...]
Description:
A simple thermistor triggered cold switch with adjustable threshold.
Notes:
The thermistor used has a resistance of 15k at 25 degrees and 45k at 0 degrees Celsius. A suitable bead type thermistor can be found in the Maplin catalogue. The 100k pot allows this circuit to trigger over a wide range of temperatures…..
Read more : Frost Alarm [...]
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