Okay this is for the electronic project geeks out there. I wanted to install a time delay relay into the remote turn on leads going to the amps to eliminate any chance of "thump" from turning the ignition etc. I googled around and found this.
http://ourworld.compuserve.com/homepages/Bill_Bowden/page2.htm
Scroll down to the power on time delay relay. I just built it and bench tested it. With a standard 12 V power supply it supplies aproximately 7 - 8 seconds of delay before it trips the relay coil. Total cost: less than $20 in parts from Radio Shack to build 2 of them (you have to buy some of the parts in quantity, so I figured I get enough for 2). So far on the bench it works perfectly. Shortening the delay is just a matter of swapping one of the resistors for a lower value, so it should be easy to customize.
FYI the only part I had a hard time finding was the 2N3053 transistor, so I used a TIP3055, which is more common. The circuit works, so it's all good. Oh yeah, use an electrolytic capacitor, because you want it to be polarity specific.
Replies (2)
pigwiggle on 02/7/2006 11:47:08
Two questions; bass thump certainly is annoying, but is it damaging, and how does a time delay relay prevent thump?
Thanks
Victor on 02/7/2006 16:01:09
This is interesting, i would like to try and make a time delay circuit for speakers,
the idea would be inserting a time delay in such a manner that the left and the right channels play to make you feel as if u are in centre of the sound stage, many company;s incorporate this in their Hu's and Electronic Xovers, wonder if it could work out with home made circuits..
have to see what kinda of phase and time delay is actually required and then work on it accordingly..but woudl surely like to experiment this in free time..
Victor..
http://ourworld.compuserve.com/homepages/Bill_Bowden/page2.htm
Scroll down to the power on time delay relay. I just built it and bench tested it. With a standard 12 V power supply it supplies aproximately 7 - 8 seconds of delay before it trips the relay coil. Total cost: less than $20 in parts from Radio Shack to build 2 of them (you have to buy some of the parts in quantity, so I figured I get enough for 2). So far on the bench it works perfectly. Shortening the delay is just a matter of swapping one of the resistors for a lower value, so it should be easy to customize.
FYI the only part I had a hard time finding was the 2N3053 transistor, so I used a TIP3055, which is more common. The circuit works, so it's all good. Oh yeah, use an electrolytic capacitor, because you want it to be polarity specific.
Replies (2)
pigwiggle on 02/7/2006 11:47:08
Two questions; bass thump certainly is annoying, but is it damaging, and how does a time delay relay prevent thump?
Thanks
Victor on 02/7/2006 16:01:09
This is interesting, i would like to try and make a time delay circuit for speakers,
the idea would be inserting a time delay in such a manner that the left and the right channels play to make you feel as if u are in centre of the sound stage, many company;s incorporate this in their Hu's and Electronic Xovers, wonder if it could work out with home made circuits..
have to see what kinda of phase and time delay is actually required and then work on it accordingly..but woudl surely like to experiment this in free time..
Victor..
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