This 12V to 9V DC converter is very useful for powering 9V DC devices in a car that uses 12V battery. The maximum current consumption allowed by this circuit is 0.8 amps.
Temperature to Voltage Converter using Thermistor (PCB)
This circuit convert the sensed temperature by a thermistor into a voltage level. The circuit achieves an acceptable performance between 0°C and 24°C