Transistor LED Flasher
A simple LED flasher that uses only two transistors, one capacitor and one resistor. This basic oscillator can have other simple applications. (6/10/2006)
If you are familiar with LED flashers using transistor, you may know the basic one uses two transistor, one capacitor and three resistors. There is other kind of oscillator called "flip-flop". As I'm starting to develop some basic circuits, I need a simple LED flasher that can be used in many other applications.
After some hours thinking how to create a new simple LED flasher with the minimum components, I decided to use a simple RC. Here is the schematic of my two-transistor LED flasher:




The resistor and the capacitor define the frequency. The circuit with the lightbulb may not work if the bulb works with 6 volts or its resistance is low.
12/26/2007 - Update:

The idea of this one was to get a flashing light without bulky or heavy parts. Regardless there are some LED flashers on the market, A LED with integrated circuit inside the acrylic, the cost is higher than this circuit in some cases.
At least you can get an idea how to make a "coin-type" battery holder.
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