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Temperature sensor circuit diagrams

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Thermostat for 1KW Space Heater (SCR controlled)
Thermostat for 1KW Space Heater (SCR controlled)
December 27, 2010

The heater element (not shown) is connected in series with two back to back 16 amp SCRs (not shown) which are controlled with a small pulse transformer. The pulse transformer has 3 identical windings, two... [more]

Hot Water Level Indicator
Hot Water Level Indicator
December 12, 2010

A simple device to indicate various levels of hot water in a tank. [more]

On-Off Temperature Control
On-Off Temperature Control
December 9, 2010

This circuit controls a load (in this case a dc brushless fan) based on a temperature compared with a setpoint. THe transduced is a diode in the forward polarization regime. In fact when forward biased,... [more]

Temperature-controlled Fan
Temperature-controlled Fan
October 25, 2010

This circuit adopt a rather old design technique as its purpose is to vary the speed of a fan related to temperature with a minimum parts counting and avoiding the use of special-purpose ICs, often... [more]

Frost Alarm
Frost Alarm
October 23, 2010

The thermistor used has a resistance of 15k at 25 degrees and 45k at 0 degrees celsius. [more]

Fridge door Alarm
Fridge door Alarm
October 23, 2010

This circuit, enclosed in a small box, is placed in the fridge near the lamp (if any) or the opening. [more]

Heating System Thermostat
Heating System Thermostat
October 23, 2010

This circuit is intended to control a heating system or central heating plan, keeping constant indoor temperature in spite of wide range changes in the outdoor one. [more]

Temperature Monitor
Temperature Monitor
October 12, 2010

Using a thermistor in the position shown makes a heat activated sensor. A change in temperature will alter the output of the opamp and energize the relay and light the LED. Swapping the position of... [more]

Electronic Thermostat and Relay Circuit
Electronic Thermostat and Relay Circuit
October 4, 2010

Here is a simple thermostat circuit that can be used to control a relay and supply power to a small space heater through the relay contacts. The relay contacts should be rated above the current... [more]

Fire Alarm Using Thermistor
Fire Alarm Using Thermistor
October 4, 2010

In this fire alarm circuit, a Thermistor works as the heat sensor. When temperature increases, its resistance decreases, and vice versa. At normal temperature, the resistance of the Thermistor (TH1) is approximately 10 kilo-ohms, which... [more]


circuit from:http://www.extremecircuits.net/2009/07/fire-alarm-using-thermistor.html



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