Abstract: A self-chargeable timepiece includes a pair of small and large capacitors having respective small and large capacities and selectively disconnectably connected at their respective terminals to time-keeping circuitry and a solar cell. The pair of small and large capacitors cooperate with each other during the momentary operation of the solar cell for selectively receiving and storing the electric charge to develop respective terminal voltages across their respective terminals even after the momentary operation of the solar cell. A detector periodically detects the terminal voltages of the small and large capacitors during the time-keeping operation. A switching circuit responds to the detected terminal voltages for selectively connecting and disconnecting the small and large capacitors to and from the time-keeping circuitry to enable the small and large capacitors to selectively power the time-keeping circuitry.

Abstract: A circuit for charging capacitors having a power source, a plurality of capacitors for accumulating an electric charge from the power source, switching elements with electrically controllable inputs for connecting or disconnecting at least one of the capacitors to or from the power source, and resistors for setting the switching elements to turn off. These resistors are connected to the control inputs of the switching elements and to one of two terminals of the power source directly so that the resistors consume the electric charge only when the power source supplies the electric charge.

Abstract: In a temperature gradient adjustor for a temperature-compensated electronic watch, the temperature gradient adjusting range can be widened without any drop in the temperature gradient adjusting resolution of a temperature sensitive oscillator by adding a roughly temperature gradient adjusting variable frequency divider for variably dividing the frequency of the output of a temperature sensitive oscillator and by operating the temperature gradient adjustor at a value which is prepared by adding a constant numerical value to temperature gradient adjusting numerical information.A constant voltage supplying to a temperature sensitive oscillator can be finely adjusted from external side so as to optimize a linearity of frequency versus temperature characteristic.