Sequential Timer Design

I’m working on a small electronics project but don’t know too much about designing circuits so I figure I would ask someone who knows and this seems like the place. Ok,

What I’m looking for is the following: I need a circuit that when the switch is pressed it will close the circuit and in an adjustable amount of time via adjustment knob: I’m not sure what the name of the adjustment component is called but its: (A small box shaped component that can be adjusted using a small screw driver. In a circular clockwise motion to speed up the time and counter-clockwise to slow it down) a solenoid will actuate and move in the forwards direction….

 See entire thread here Two Stage Sequential Timer – del90004

Mail from RH  USA 2004

This is an example of a cascaded or sequential timer, here two CD4541 are forming a two stage timer. You can add more in a chain, but better to use a microprocessor or Microcontroller for such a purpose.

The circuit is a two stage sequential timer with auto reset. It can turn a Solenoid On/Off after a Sequence of delays that are preset. This is also a basic example of timer usage in automation.

All Timers are 1 – 30 Secs Analog with Presets to adjust with a screwdriver. The Switch, Solenoids and Power supply has to be via terminal blocks or plug-jacks. The PCB may be upto six Square Inches for standard DIP components but with SMD it may be smaller.

delabs