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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) |
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Low Voltage High Current Time Delay Circuit - (circuit added 7/02) |
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Power Off Time Delay Relay Circuit - (electronic circuit added 7/03) |
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Power on Time Delay Relay Circuit - (circuit / schematic design added 6/06) |
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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) |
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Relay Delay - (electronic design added 10/06) |
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Relays: Delayed Turn-On - (circuit added 9/04) |
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Smooth Tone Clickless Cw SideTone Generator - (electronic circuit added 7/03) |
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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) |
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Time Delay Relay (Aaron Cake) - (electronic schematic / circuit added 08/08/08) |
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Time Delay Generator - Circuit Ideas for Designers Application Notes Advanced
Linear Devices, Inc. (app note added 6/06) |
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Time Delay Relay II (Aaron Cake) - (circuit / schematic design added 08/08/08) |
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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... . |
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Timer circuits for Very Long DelaysUsing a CD4541B - Very Useful Timers....(design
added 12/08) |
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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.... |
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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) |
