Here is a simple heater circuit that can be operated from a 12V battery. The first part of the circuit is an astable multivibrator build around the two transistors Q1 and Q2 . The ON time of ...
A typical multivibrator that operates in astable mode is capable of driving an LED with the use of a single cell. The ability to use a 1.5V cell to light up a LED is a big challenge since the forward ...
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