A draft Specifications has been made and
attached to this mail. There are both html and
pdf versions. You can study them and make the
required specs or tell me the changes. The
specs are in an electronic point of view not
mechanical. When the specs are frozen and
approved by you, we can start.
Two Stage Sequential
Sorry for the delay the new solenoids have
arrived and there is a change in the circuit.
The change has been made for simplicity as well
as battery consumption. Please review the
description and get back to me.
The circuit is a Two stage sequential
timer with auto reset.
Sequence Of Operation -
1. Power on the Circuit.
2. If Start switch is pressed.
3. Then after Timer Delay T1 Secs the
Solenoid Operates in Forward Direction.
4. Next after Timer Delay T2 Secs the
Power is cut off, and the Timers are Reset.
6. Circuit Ready for next press.
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.The PCB may be up to
four Square Inches for standard DIP components
but with SMD it may be smaller.
Solenoid Specifications -
Volts - upto 50V Current - up to 1A
Type Push-Pull on Reversal of
reply from RH
Attached are the specs for approval, with
the changes you have indicated. The
circuit can be designed and sent to you
after you approve specs. Two Stage Sequential
waiting for the specs
I have a just a few more questions
before I approve this. Is it possible to
have an LED indicator so I would know when
the Solenoid is about to engage? For
instance a yellow LED to illuminate when
the activation switch has been push and T1
has been activated, followed by a Red LED
with an adjustable amount of time before
the Solenoid engages say 1-5
seconds? I was also looking through my
Jameco electronics catalog and see that
they have these rotary dip switches with
numeric digits on them so you would know
what time you have set. Can these be
integrated into the circuit instead of
standard ones? Thanks once again for your
time and if you have any questions please
feel free to ask.
reply from RH
We can have one LED yellow turned on when
you press the start switch and Timer T1 is
started. This yellow LED will turn off
when both timers are RESET and cycle is
complete and solenoid is off.
We can have another red LED to show the
solenoid has been powered, and will go off
when solenoid is off.
These LEDs above can be put without adding
much circuits, other LEDs with delays need
The Rotary dip switches may not be useful
here, as they may not give a smooth
control. You can use preset potentiometers
with markings or graduations if they are