The following schematic will give a smooth changing color from red to green, then yellow. NE556 dual timer is an IC equals to two 555 IC but in one package. The oscillator is set at different frequencies. The upper part is used to build a PWM signal, and the lower frequency is used to control [...]
Sudden Death Infant Syndrome is a condition when a healthy looking infant (usually on age 0-1 year) suddenly death without any explanation. This is a mysterious problem, and right now the scientists in the USA is trying to figure it out how to prevent this. Meanwhile, there is a circuit to monitor your baby even [...]
This circuit is taken from the National Semiconductor Application Notes. Using the IC LM134 and LM10, a -55 to 150°C sensing range thermometer can be built. For this circuit, the ideal meter is a 0-200uA digital ammeter. This ammeter can show both positive and negative polarity in order to show the temperature below zero degree [...]
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