This basic circuit was found in the March 1998 issue of Electronics Now magazine. The circuit is powered by 2V and uses a 28 MHz crystal or resonator.
This circuit uses an old National Semiconductor operational amplifier, but it can be implemented with...
In this circuit the regulation is made from a circuit in the LED cathode. The configuration is...
For the component values used in thisf this circuit, the frequency can be adjusted between 740 Hz and...