This low power circuit was obtained from an American 80's documentation. The circuit indicates the voltage of a battery being trimmed by the trigger point. The transistors can be the BC549.
L1 and C1 determine the frequency of this Colpitts Oscillator. Refer to our section Mathematics...
November 2016 - Lumileds' new high power Luxeon 5050 LEDs can now be purchased from Mouser...
We find this circuit in a 2005 Linear Technology manual. The circuit applies to small DC motors...