Electronic Engineering Schematics
Two Stage Sequential Timer - del90004
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. But make sure EMI-RFI immunity is high for these
circuits or wrong resets and sets can make a machine like an
Oven or Environment Chamber malfunction and even ruin the job.
See how a Power-On Delay or Off-Delay timer can be built. - Analog
Blind Dial On Delay Timer
U5B a flip-flop is used for the control switches Start and Stop
to prime or shutdown the sequential cycle. The first timer U2
sets the flip-flop or register U5A after a period T1, this
register turns the relay on thru Q3. The second timer U4 which
was triggered by the first will reset the U5A after time period
T2, U5A then shuts down relay. U5A also then resets entire
process thru U3C and U3D.
To view the circuit below, Click the Link of PNG or PDF and
view the Circuit, PNG can be Scrolled with Drag-Drop
Left-Click-Mouse and you could use the PDF to take a paper
print for reference only.
Stage Sequential Timer - del90004
Below is a Preview Image Linked to the Larger Circuit
Here is another application need for Timer in my mail archive -
Cyclic Timer Ideas
In this application two 4541 Timer Chips are Sequentially
connected. A Start and Stop User Interface controls the process
which is a sequence of Operations. A Solenoid is turned on after
a delay and turns off in a second delay.
Back to Design Service and Project
20th Mar 2020