Car Electronics and Lights
Windows XP
iPhone 3GS
Circuits

How do you set up an RC circuit that will keep a 12V lamp on for 4 seconds after depressing the switch?

303132

Top Answer
User Avatar
Wiki User
Answered
2005-11-05 18:43:23
2005-11-05 18:43:23

Use a transistor to drive a small relay. When the switch is pressed it should turn on the transistor and at the same time charge a small capacitor. Discharge the capacitor over 4 second time period with a resistor. You will have to experiment with resistors to find one that gives an acceptable discharge rate. Note, if the 12V lamp is running DC you can drive it directly with the transistor and forget about the relay.

001
๐Ÿ™
0
๐Ÿคจ
0
๐Ÿ˜ฎ
0
๐Ÿ˜‚
0

Related Questions


An airsoft pressure switch is basically a switch that controls a laser or flashlight by depressing a small pad that is basically a switch accept you must keep pressing it down in order to keep the light on or laser on.

For an electrical circuit to keep going, it cannot be interrupted. When the switch is adjusted, the electrical flow is interrupted. Move the switch again and the flow is restored. Without a switch a circuit is no longer considered a complete circuit. Simple fifth grade science.

It is a relay or switch problem. A circuit breaker or fuse won't keep a light on.

A circuit must be closed in order for a current to flow because it helps keep a current flow pass. When the switch is closed on a circuit there is a constant flow. When the switches open the flow is disturbed around the circuit.

Spring inside button is stuck; try WD 40 and keep depressing it; if it won't snap back you will need to replace the entire turn signal switch assembly.

Feelings of guilt can be depressing and keep you from moving forward with your life

Set the multi-information display to TRIP A. Turn the ignition switch off. Press and hold the ODO / TRIP switch, and turn the ignition switch on (IG). After turning the ignition switch on (IG), keep holding the switch for at least 5 seconds.

Found problem, intermittent short circuit problem in turn signal switch, replaced switch, problem went away.

The easiest way is to connect a 12v battery to the circuit. Be sure to place a diode in the positive line (watch polarity) to keep the battery from loading down the power supply when charging.

Roll down the window using the switch on whatever door your are trying to synchornize, then back up and keep holding the switch up for 2 seconds. Do that for each window and they will all be auto.

if its not the alarm malfunctioning, there is a short circuit somewhere between the switch/battery/relay and the horn its self - youll have to find the short and insulate the wire or replace the switch.

1. Make sure the engine is off. 2. Press the brake pedal. 3. Insert the key in the ignition. 4. Turn the key to the "ON" position, but do not start the engine. 5. Within three seconds of turning the key to the "ON" position, depress the brake pedal and then keep pressing and depressing it for a total of ten times (including the initial depressing) in less than ten seconds. This means that you should be pressing the brake pedal every time in less than a second.

Check your instructions, Usually you have to keep it on pilot mode for 30 seconds then you should be able to turn it to on without the pilot flame going out.

No, if it has a fuse then that is the protection for that circuit. If the fuse keeps blowing then you are either using too small a fuse or you have something wrong with that circuit. Short inn the circuit or it is overloaded. Make sure you are using the correct size fuse and do not use a larger fuse than required.

Most isolation switches are not rated as current interrupting switches. Closing the switch should not be a problem. It is opening one of these types of switches under load where the problem arises. The switch has no arc chutes to extinguish the arc when the switch's blades are opened. There will be a long electric arc drawn from the stationary blade to the movable blade as the current wants to keep flowing. Proper procedure is to open the circuit supply breaker, lock it out, and then open the isolation switch. When the work is complete on the equipment that is being worked on, close the isolation switch and then unlock the supply circuit breaker and turn it on.

you just have to make a circuit and keep it open.. by not joining the switch wires now when the wires or any other conducting material will get dipped in water the alarm. light, or any other form of signal will be seen..as the circuit will be completed

Place key in ignition but do not start vehicle. Move the key to the "on" position illuminating the odometer. Depress the mileage re-set button - continuing to keep the re-set switch depressed - turn off the iginition. KEEP THE RE-SET SWITCH DEPRESSED and after a few seconds turn the ignition back on. Still keeping the re-set switch depressed wait a few seconds and the light should turn off.

Switch engine OFF. Ensure instrument panel displays recorder reading. Press and hold button A ( 26940 ) mileage reset button. Switch ignition on. Keep button A depressed for at least 10 seconds unroll service indicator shows appropriate service interval and the message " insp " displays for 2 seconds. Keep button depressed until " ---" appears in the display. Release button A. Switch ignition off.

Fuses dont trigger anything they keep a circuit from burning up if shorted out The brake switch attached to the brake pedal does

Log off will close all your programs. Switch user will keep them open.

The duration of Keep It for Yourself is 2400.0 seconds.

The duration of Keep in Style is 360.0 seconds.

The duration of Keep on Rockin' is 1560.0 seconds.

The duration of Keep Posted is 1800.0 seconds.


Copyright ยฉ 2020 Multiply Media, LLC. All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply.