Single blinking LED relaxation oscillator. To get it to start, you must first open the switch on the corner and then close it. The design is extremely low power, consuming less than a microamp while the LED isn't lit. When the LED is lit, most of the power goes to the LED and the overhead of the oscillator is again only 2 microamps.
The resistor to ground from the capacitor can adjust the off time. The resistor from the capacitor to Vcc can increase the on time but only within limits. If the resistor is too large, the transistor will stay in saturation and fail to oscillate.
Comments welcome!
