Thanks to members assistance I have successfully built a 555 timer circuit with variable timing. The output from my circuit will be connected in parallel with a wall switch on/off/on which controls the raising and lowering of an electrically operated window blind. My problem is that when the circuit is automatically operated by a time clock the blind will wind up to a predetermined height. Then after 15 minutes (minimum time delay from the time clock) the electricity is switched off to the circuit. The next time the switch is activated the blind will rise until it is stopped by the motor limiter. Is there any way I can fix it so that the second time the relay activates it connects to the down side of the switch? Any advice greatly appreciated.