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Old 01-21-2013, 07:39 AM   #51
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Checked with whitedemon, and, I'm wondering if there is interest in kits for these. I'm thinking just the parts and a board for people to build up on their own.

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Old 01-21-2013, 07:41 AM   #52
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ok everyone i am updating you. I hardly drive my car so this weekend i took it out and got to use the lights alot. Come to find out the relay coils are drawing to much current when the brakes are applied, like at a red light, and the current over heated the 555 timer and popped it. The left side popped and lost the delay, right side actually chipped off from the heat. So a mosfet WILL need to be used instead of the relay. I will be building a 2.0 version of the delay circuit with the mosfet either tonight or tomorrow and I will post pics for you. Sorry for this, I didnt realize how much current a relay coil drew. The mosfet will work and be reliable.
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Old 01-21-2013, 07:42 AM   #53
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Quote:
Originally Posted by sjmautoprod View Post
Checked with whitedemon, and, I'm wondering if there is interest in kits for these. I'm thinking just the parts and a board for people to build up on their own.

I'd be interested if it doesn't raise the price too much - also, just really would like a "tested" parts list - still waiting (unless I've missed it) a working version without the relays . . .

Paul
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Old 01-21-2013, 07:43 AM   #54
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Originally Posted by whitedemon View Post
ok everyone i am updating you. I hardly drive my car so this weekend i took it out and got to use the lights alot. Come to find out the relay coils are drawing to much current when the brakes are applied, like at a red light, and the current over heated the 555 timer and popped it. The left side popped and lost the delay, right side actually chipped off from the heat. So a mosfet WILL need to be used instead of the relay. I will be building a 2.0 version of the delay circuit with the mosfet either tonight or tomorrow and I will post pics for you. Sorry for this, I didnt realize how much current a relay coil drew. The mosfet will work and be reliable.

Cool - thanks for being the tester!!! Looking forward to seeing the results . . .
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Old 01-21-2013, 10:26 AM   #55
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Personally I would just built my own once the parts are posted. However if it was only 10 more on top of cost of parts, that is tempting to buy a kit already to go.
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Old 01-21-2013, 11:00 AM   #56
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I'd do a kit if available vs. chasing correct doo-dads!!!! Do it!
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Old 01-21-2013, 11:02 AM   #57
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Personally I would just built my own once the parts are posted. However if it was only 10 more on top of cost of parts, that is tempting to buy a kit already to go.
Especially if the board is etched, rather than breadboard with jumpers . . .
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Old 01-21-2013, 11:48 AM   #58
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We could make a prototype board (no silkscreen or solder mask), or, one with both of those. The first one would be pretty low-cost. I'll run the numbers, but, it's all based on quantity. I'm thinking only 10 or 25 would be appropriate.
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Old 01-21-2013, 11:54 AM   #59
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Quote:
Originally Posted by sjmautoprod View Post
We could make a prototype board (no silkscreen or solder mask), or, one with both of those. The first one would be pretty low-cost. I'll run the numbers, but, it's all based on quantity. I'm thinking only 10 or 25 would be appropriate.
How many boards are needed? 4 or 2? Does the $10 to $20 include a full kit, or is that per board? I would think at least 2, 1 for each side? I would think that anything under $30 shipped for a complete kit would be fair. That is just basing it on the $20 parts cost.
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Old 01-21-2013, 11:59 AM   #60
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Two boards would be required. I have not mentioned a price yet. The boards would definitely be the highest-cost items as they would be custom and low-volume.
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Old 01-21-2013, 12:05 PM   #61
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Two boards would be required. I have not mentioned a price yet. The boards would definitely be the highest-cost items as they would be custom and low-volume.
Yeah sorry i saw the 10 -25 and thought it was price but then re-read and noticed that was quantity. Thank for the clarification on how many boards are needed.
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Old 01-21-2013, 12:50 PM   #62
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I am into doing the work myself to keep the cost down. I am ok with driving to the store myself and saving some money.
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Old 01-21-2013, 01:47 PM   #63
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I almost posted the bare-board pricing, but, remembered that I can't, per the forum rules. PM if interested.
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Old 01-21-2013, 02:06 PM   #64
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so here is the block diagram for use with a MOSFET/TRANSISTOR. i got it from the same website as the OP. the only issue i've had so far is finding a P-type MOSFET. i've gotten the circuit to work with a small PNP type transistor but have yet to find one that can carry the AMP's required by the bulbs. 90% of everything at radio shack is NPN or N type which is backward of the way the light is supposed to work. IE: it comes on first and then shuts off after the time out. still working on it. if anybody has suggestions, im open...
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Old 01-21-2013, 02:55 PM   #65
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Looks like this PNP will work, but you may have to heat sink it.
http://www.digikey.com/product-detai...5FS-ND/1052872
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Old 01-21-2013, 03:06 PM   #66
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Looks like this PNP will work, but you may have to heat sink it.
http://www.digikey.com/product-detai...5FS-ND/1052872
OK for us who can't see it - what shows you it might have to heat sink it?
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Old 01-21-2013, 03:43 PM   #67
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OK for us who can't see it - what shows you it might have to heat sink it?
It has to do with power dissipation. This part will handle 5 Amps, but only with proper heat dissipation. I am kind of interested in doing this to my car also but need to find the time.

I think the relay will work also, you just need to add a transistor to the output of the 555.

Let me give it some thought and calculations and I will get back with you guys.
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Old 01-21-2013, 03:52 PM   #68
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Originally Posted by 67ss350camaro View Post
It has to do with power dissipation. This part will handle 5 Amps, but only with proper heat dissipation. I am kind of interested in doing this to my car also but need to find the time.

I think the relay will work also, you just need to add a transistor to the output of the 555.

Let me give it some thought and calculations and I will get back with you guys.
Cool, thanks!!!
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Old 01-21-2013, 04:53 PM   #69
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how about a relay with a coil current rated at 30mA which is under the 200mA output of the 555 timer. not sure what relay the OP used which may have had a coil draw over the rated output of the 555.
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Old 01-21-2013, 04:58 PM   #70
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Old 01-21-2013, 06:32 PM   #71
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Just FYI, I would be interested in a kit if one comes together. Looking for what exactly I need at my RadioShack isn't my cup of tea.
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Old 01-21-2013, 10:00 PM   #72
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hapisok, The 555 timer doesn't have enough drive to power the Relays, instead use the 555 to drive the transistor, and have that turn on the Relay.
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Old 01-21-2013, 10:41 PM   #73
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Well, a 30mA-coil relay is a game-changer.
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Old 01-21-2013, 11:36 PM   #74
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I would pull the trigger on a solder-it-yourself kit if the price was right...
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Old 01-22-2013, 02:54 AM   #75
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Originally Posted by sjmautoprod View Post
Checked with whitedemon, and, I'm wondering if there is interest in kits for these. I'm thinking just the parts and a board for people to build up on their own.

I'm in for something that is ready to go.
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