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Delay Circuits
Delay Circuits:  #'s - H     I - Z

Last Updated on:
Friday, March 12, 2010 12:07 PM

Circuits Designed by Dave Johnson, P.E. :
  • LONG PERIOD COMPUTER WATCH DOG TIMER
    This circuit uses a simple 4060 IC oscillator/timer that is reset periodically by a computer. Should the computer fail to send a pulse, the output changes state. The time can easily be set from seconds to hours.

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Long Period Computer Watch Dog Timer - This circuit uses a simple 4060 IC oscillator/timer that is reset periodically by a computer. Should the computer fail to send a pulse, the output changes state. The time can easily be set from seconds to hours. ….(designed by David A. Johnson)
Low Voltage High Current Time Delay Circuit - (circuit added 7/02)
Power Off Time Delay Relay Circuit - (electronic circuit added 7/03)
Power on Time Delay Relay Circuit - (circuit / schematic design added 6/06)
Power-Off Time Delay Relay Circuit - (electronic circuit added 4/05)
Power-on sequencing using TL431 in comparator mode - TL431 as a comparator. Delay timers. Power-on sequencers. TL431 without feedback can be considered as an NPN or N-MOS device with high transconductance and precise 2.5V turn-on voltage. Tube heads beware: the upper (+supply) pin on TL431 is cathode, lower (-supply) - anode... it's another world. ….(design added 07/07)
Relay Delay - (electronic design added 10/06)
Relays: Delayed Turn-On - (circuit added 9/04)
Smooth Tone Clickless Cw SideTone Generator - (electronic circuit added 7/03)
Soft-Start Circuit For Power Amps - Although the soft start circuit can be added to any sized transformer, the winding resistance of 300VA and smaller transformers is generally sufficient to prevent a massive surge current. Use of a soft start circuit is definitely recommended for 500VA and larger transformers....(electronic design added 10/06)
Time Delay Relay (Aaron Cake) - (electronic schematic / circuit added 08/08/08)
Time Delay Generator - Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc.  (app note added 6/06)
Time Delay Relay II (Aaron Cake) - (circuit / schematic design added 08/08/08)
Time Delay Relay Reduces Inrush Current - 03/(07/02  EDN Design Ideas / (schematic / circuit added 11/03)    A transformer switching onto a line can sometimes cause a circuit breaker to trip or a fuse to blow. This phenomenon occurs even if the transformer presents no load, such as when the secondary is open. The problem arises because of the heavy magnetizing inrush... .
Timer circuits for Very Long DelaysUsing a CD4541B - Very Useful Timers....(design added 12/08)
Transistors Offer Overload Delay - 09/16/04 EDN Design Ideas  /  (added 1/05)    Although an SMPS (switch-mode power supply) can protect itself against permanent short circuits, it sometimes has problems when dealing with transient overloads. Transient overloads are not short circuits but can push the power supply above its nominal load value. This scenario occurs with typical loads such as printer heads and small motors....
Windshield Wiper Delay - The intermittent wiper circuit shown above causes the auto's windshield wipers to wipe once every several seconds instead of constantly wiping. The circuit may be added to older cars to provide the intermittent function or it ....(electronic circuit added 08/08/08)

 

Delay Circuits:  #'s - H     I - Z

 
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