Auto Heat Limiter for Soldering Iron
#temperature control
#soldering iron
#heat limiter
#thermistor
#auto shutoff
#safety
#electronics
#DIY
#circuit protection
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Frost Alarm
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...
Homemade Metal Detector Kit
A simple home project can quickly become problematic if it encounters electric cables, gas, or water pipes, or the central heating system. Using a metal detector allows one to check for metal objects within walls, ceilings, or floors beforehand. An...
Temperature Monitor circuit
A thermistor positioned as indicated creates a heat-activated sensor. Variations in temperature will modify the output of the operational amplifier, triggering the relay and illuminating the LED. Reversing the placement of the thermistor and the 47k resistor converts the setup...
Temperature Controler switch
This circuit controls a load (in this case a DC brushless fan) based on a temperature compared with a setpoint. The transducer is a diode in the forward polarization regime. In fact, when forward biased, the forward voltage drop across...
Temperature Controlled Relays 4001/4011
The first circuit energizes the relay when the temperature rises above the preset level. The second circuit energizes the relay when the temperature falls below the preset level. The two circuits are practically identical. The only difference between them is...
Heat sensor relay switch
The Thermistor, or NTC (Negative Temperature Coefficient) of 10K, is a standard type. Most types will work. The one in the diagram is a 10K model made by Fenwal (#197-103LAG-A01). The resistance lowers as the surrounding temperature increases, which affects...
Household appliances electric water heater temperature regulating circuit circuit
The electric water heater temperature control circuit includes functions for water level indication, temperature regulation, anti-dry protection, and automatic leakage power protection, ensuring safety and reliability. The circuit consists of a power circuit, leakage protection circuit, temperature control circuit, and...
Zero degree Celsius alarm
This circuit is designed to trigger an alarm when the temperature drops below zero degrees Celsius. A thermistor is utilized to measure the temperature. The operational amplifier LM7215 is employed to compare the reference voltage with the voltage from the...
Temperature Fan Controller
This circuit controls very accurately a fan of any size. Just adjust the associated resistors for a different type like the R6 resistor of 100 ohm, 2 watt type and you're all set. The above circuit diagram is for a...