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Two Stage Sequential Timer - del90004This 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.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 PDF can be Viewed-Zoomed in the Browsers with Acrobat plugin. The Javascript and Images must be enabled in your Browser. |
| PNG-Schematic
PDF-Circuit DSN-Source |
| Two Stage Sequential Timer - del90004 |
| PNG
Image Can be
Scrolled by Drag-Drop Left-Click-Mouse, PDF Requires Adobe
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More Information :ISE Timers and Counters.Solenoid design considerations. Timers and Counters of Anderson Bolds. Timers and Relays. |