| Author | Views | Views Today | Rank | Comments |
| 13,471 | 1 |   |
6 |
| Author | Views | Views Today | Rank | Comments |
| 13,471 | 1 | |
6 |
|
This circuit will automatically switch on several mains-powered "slave" loads when a "master" load is turned on. For example, it will switch on the amplifier and CD player in a stereo system when the receiver is turned on. It works by sensing the current draw of the "master" device through a low value high wattage resistor using a comparator. The output of that comparator then switches on the "slave" relay. The circuit can be built into a power bar, extension cord or power center to provide a convenient set of "smart" outlets that switch on when the master appliance is powered (turn on the computer monitor and the computer, printer and other peripherals come on as well). |
Schematic |
Parts |
|
Notes |
Related Circuits |
Comments |
| what is the value of R2 and R6, when we want to use 240v as the supply???urgent... | ||
| ohms law , would indicate half the resistance , not double and it would be 4 times the wattage(power dissapation---...---...---...G.R.. . . . . | ||
| Ohm's should tell you that if you double the voltage in, and you want the current to stay the same, double the resistance. This will also double the power dissipation of the resistors. | ||
| when used at 240V. What need R2 & R6 to be. // Morten | ||
| The values of R2 and R6 need to be CHANGED if you are in 240V like we are in the UK. Again, what is the value or formula for R2 & R6 please? | ||
| What is the Values of R2 & R6 (Editor's notes: Try looking at the parts list.) |
||
| The last 10 comments are currently shown. Show All Comments. |
If you would like to leave a comment, you can do so using the form below. Comments can be things like suggestions, successes or failures, improvements, similar circuits, error reports, an answer to a previous commenter's question, or anything in between. However if you would like to ask a question it is suggested that you use the forum instead. The forum provides a more robust environment for discussion.
Important: If you post a technical question here, there is no guarantee it will be answered. All technical questions should be posted to the forum. The owner of this site generally does not answer questions in comments.
All comments are subject to approval before they are displayed here, so your comment will not appear immediately. This is done mainly to prevent spam and other abuse. If you wish to remain anonymous, simply enter "anonymous" for your name and/or email.