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A Cheap Dependable Buzz Coil

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Ernie
Posted on Tuesday, June 08, 2004 - 08:09 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Here are drawings and instructions from J.B. Castagns on how to make a cheap buzz coil that really works good. I saw several at the Calvert Show and they will put out a good 1/2 inch spark.

Buzz Coil
This is a buzz coil made from automotive parts. The coil is preferably an internal resistor type, but an external resistor will work. The relay is a Bosch type, used for accessories on most late model cars. A trip to the junkyard should get you a handfull for $5.00. Look for the ones with 5 terminals, some only use 4 and won't work. Note make sure that there are terminals 87 and 87a. If the relay has 2 terminals numbered 87 this won't work. I use Ford condensors because the brackets work well, but any auto condensor should work. The relays usually have a schematic on the cover. You will see that terminals 85 and 86 are the coil in the relay. These are wired in parallel with the automotive coil, one wire from the neg. terminal of the coil to 85 and one form the positive to 86. Terminal 30 is the common on the points of the relay and 87a is the normally closed. A wire is jumped terminal 86 to 87a. A wire is connected from terminal 30 to the battery positive. The condensor can be screwed onto the coil terminal, this mounts it and makes a connection, a wire is then run run to terminal 30. If you look at the diagram you will see that this is giving you a condensor across the relay points. The second condensor is optional, but you should be used if your engine has points in the timer. If the points don't open fast and clean this system will continue to draw an arc across the points, possibly causing a misfire. Condensor 2 is wired to work with the points in the timer. The relay acts as a buzzer in this system. When power is supplied to the coil the relay coil is energised also. This causes the points to open in the relay, de-energising th ecoils and firing, th epoints close and repeat.
J.B. Castagnos
jbcast@charter.net
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Ernie
Posted on Tuesday, June 08, 2004 - 11:38 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Andrew,
Can you add this to the "tech" section?
Thanks
Ernie
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Richard Day
Posted on Wednesday, June 09, 2004 - 08:07 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Why not add a second coil and it uses the buzzer as a "Master Vibrator" Model T Ford style? Add a third coil for a three cylinder engine and a fourth for a four cylinder.
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J.B. Castagnos
Posted on Wednesday, June 09, 2004 - 01:29 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Dick, the buzzer may be able to handle more than one coil but they're hooked in parallel with the coil, all coils would fire at once. This would work for an opposed engine where both fire at the same time but not one firing 180 degrees apart.
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Richard Day
Posted on Wednesday, June 09, 2004 - 09:29 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

What I had in mind is the multiple coils would only be grounded one at a time so the buzzer circuit would only see one coil at a time. Thats the way the master vibrator circuit works. Will have to work on a diagram as soon as I can get my hands on one of the buzzers. How is John doing by the way. Regards to you all.
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Paul Leboeuf
Posted on Thursday, June 10, 2004 - 07:56 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I can vouch for JB Castagnos' buzz coil. Its so easy to put together and will def. knock your socks off if by chance you hold on to the spark plug wire. oops

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