One reason why commercial soldering stations are expensive is that, in general, they require the use of soldering irons with inbuilt temperature sensors, such as thermocouples. This circuit eliminates the need for a special sensor because it senses the temperature of a soldering iron heating element directly from its resistance. Thus this circuit will, in [...]
The fan is reverse mounted so that it will blow cold air into the heatsinks and transformer. The NTC is glued with epoxy to the heatsink with the powerdiode, The fan controller is changed so that the fan starts to rotate at +40 C on the heatsink, If the temperature goes further up, the fan [...]
This circuit, is basically a resistance � sensing window switch, except that the �resistor� takes the form of an NTC thermistor and the circuit thus responds to temperature. TH1 must have a resistance in the range 500ohm – 9Kohm. RV1 is used to set half � supply volts on the RV1 � TH1 junction at [...]
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