Tilt Switch -  The output is LOW at start-up due to the capacitor on pin 4. When the mercury switch closes, the output goes HIGH and remains HIGH until the reset button is pressed. This circuit is called a LATCH. . . .  [No designer name given]

Time bathroom fan -  04/27/00  EDN Design Idea   Forget to turn off the ceiling fan in your bathroom? Install the simple timer in Figure 1. It's located out-of-sight in the fan unit, and you turn it on via the wall switch. The circuit costs virtually nothing, using "junk" parts. When ac power appears, . . .  [by Maxwell Strange, Goddard Space Flight Center, Fulton, MD]

time delay circuit -  Schematic only, no circuit description. . .  [Designer's name not given]

Time Delay Circuits -  Uses the LM555 timer or its cousins with other letter prefixes. There can be minor differences between 555 timer IC's from different manufacturers but they all should be useable for any circuit. Designed for Model Trains. . . .  [from Rob Paisley's Model Train web site]

Time Delay Generator -  Circuit Ideas for Designers App Note. . .  [Advanced Linear Devices, Inc]

Time Delay Relay -  A time delay relay is a relay that stays on for a certain amount of time once activated. This time delay relay is made up of a simple adjustable timer circuit which controls the actual relay. The time is adjustable from 0 to about 20 seconds with the parts specified. The current capacity of the circuit is only limited by what kind of relay you decide to use. . .  [Design by Aaron Cake]

Time Delay Relay II -  When activated by pressing a button, this time delay relay will activate a load after a specified amount of time. This time is adjustable to whatever you want simply by changing the value of a resistor and/or capacitor. The current capacity of the circuit is only limited by what kind of relay you decide to use. . .  [Circuit designed by Aaron Cake]

Time Switch V1.0 -  New weekly scheduler made by 68HC908QY4 with kaypad and 16x1 line LCD! (not recommended). . .  [Wichit Sirichote, designer]

Timed Beeper -  . . .  [by IQ Technologies Industry, unless otherwise noted online]

Timed Beeper -  Beeps 7. 5 seconds after a preset Time Adjustable Time settings:15 sec. 30 sec. 1 min. 2 min. & others. . .  [Flavio Dellepiane's web site]

Timed Uncoupling Ramp Driver (LM555) -  Circuit for model railroad trains. . . .  [from Rob Paisley's Model Train web site]

Timer automatically shuts off -  08/17/00 EDN Design Idea   The circuit in Figure 1 is a programmable power switch that offers on-state periods of 5 sec to three hours. It consumes zero power in the off state and has zero voltage drop in the on state. S1 is a power-on switch. When you pre. . .  [by Yongping Xia, Teldata Inc, Los Angeles, CA] 

Timer chip makes universal solenoid drive -  09/01/95 EDN Design Idea   Mechanical actuators that develop a force from magnetic interaction operate efficiently with high power until seated (the pull-in state). You should then reduce the power to a lower holding level. These rules are especially true . . .  [by Richard Panosh, Vista, Bolingbrook, IL]

Timer circuit Adjustable On/Off Times Using CD4541B -  REVISED & Very Useful for some applications. . . .  [G.L. Chemelec]

Timer circuit based on a 14536 and 4011 CMOS chips that can be calibrated using a frequency counter -  Timing and oscillator circuit diagrams / circuit schematics. . . 

Timer circuits for Very Long Delays Using a CD4541B -  Very Useful Timers. . . .  [G.L. Chemelec, designer]

Timer Circuits for Very Long Delays Using a CD4541B -  Very Useful Timers. . .  [G.L. Chemelec]

Timer Circuits With 4060B -  Build a reliable timer to switch devices on and off - from 30 seconds to 24 hours. . . .  [REUK-Renewable Energy UK website]

Timer Controls DSP-Filter Frequency Resolution -  04/13/95 EDN Design Idea   To implement low-frequency digital filters, you can use low-power microcontrollers instead of dedicated DSP ICs. However, using 8-bit or even 16-bit math can quickly lead to significant filter dynamic-range errors and to complicated routines for precise digital-filter coefficients. By using a µC's 8-bit timer to set the sampling rate for a digital filter's data processing, you can obtain finer frequency resolution while using simple math routines. . . .  [by D Hayden, Tempo Research, Vista, CA]

Timer Exploits OpAmp Bias Current -  07/21/94 EDN Design Idea   The simple, low-cost analog timer in Fig 1 exploits the parasitic input-bias current of op-amp IC1. The timer achieves long time delays even though it uses only low-value, inexpensive ceramic chip capacitors. After all, because t. . .  [by Aleksandr Belousov, Baltimore, MD]

Timer for Battery-Powered Tools -  Most hobbyists will have some tools that are battery-powered, such as a drill, screwdriver or power scissors. Unfortunately (and especially with cheaper devices) the batteries often seem to be empty when you need to use such a tool. must register on this site. . .  [Published in Elecktor July/Augu, 2010]

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