Does anyone have a schematic for a simple four pin HEI ignition module
from 1970's+ ignition systems. They appear to contain an SCR and a
pair of diodes and resistors.

Pickup Coil connects to two terminals and battery and induction coil
primary the other two, mounting screw provides a ground connection.

Original type mounted to the distributor plate on GM cars and others
and was ~1/4 round shape - I want to adapt it to a motorcycle that has
pickup coils mounted remote from the modules.
--


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On Tue, 23 Sep 2008 15:26:42 -0400, default wrote:

oes anyone have a schematic for a simple four pin HEI ignition module
:from 1970's+ ignition systems. They appear to contain an SCR and a
air of diodes and resistors.
:
:Pickup Coil connects to two terminals and battery and induction coil
rimary the other two, mounting screw provides a ground connection.
:
:Original type mounted to the distributor plate on GM cars and others
:and was ~1/4 round shape - I want to adapt it to a motorcycle that has
ickup coils mounted remote from the modules.


Most 70's era street bikes would run from the 12V battery supply so you would
have to buy a kit suitable for this power supply. I don't know where you are but
here is one kit http://www.jaycar.com.au/productView.asp?ID=KC5442

If your bike doesn't have a battery which is chaarged from an
alternator/generator then it will probably use an generator supply winding to
produce the input voltage. In this case a simpler kit can be used
http://www.jaycar.com.au/productView.asp?ID=KC5466

On Wed, 24 Sep 2008 11:15:34 GMT, Ross Herbert
wrote:

On Tue, 23 Sep 2008 15:26:42 -0400, default wrote:

oes anyone have a schematic for a simple four pin HEI ignition module
:from 1970's+ ignition systems. They appear to contain an SCR and a
air of diodes and resistors.
:
:Pickup Coil connects to two terminals and battery and induction coil
rimary the other two, mounting screw provides a ground connection.
:
:Original type mounted to the distributor plate on GM cars and others
:and was ~1/4 round shape - I want to adapt it to a motorcycle that has
ickup coils mounted remote from the modules.



Most 70's era street bikes would run from the 12V battery supply so you would
have to buy a kit suitable for this power supply. I don't know where you are but
here is one kit http://www.jaycar.com.au/productView.asp?ID=KC5442

The bike is 80's runs from the battery. They call it a CDI but it
isn't - runs from 12V with no HT generator coil - the module just has
4-5 components in it (potted in black goo) induction coil is ~3.5
ohms.

The advance is managed in the pickup coil end of things.

The dealer wants $200 per module and I need two for a bike worth
~$1,000. The 70's style module for cars runs about $40 now (was $15)
each.

If your bike doesn't have a battery which is chaarged from an
alternator/generator then it will probably use an generator supply winding to
produce the input voltage. In this case a simpler kit can be used
http://www.jaycar.com.au/productView.asp?ID=KC5466

Physically too large even if it was suitable. The originals are only
one cubic inch with mostly heat sink.

turned this up in my searching
http://members.aol.com/pullingtractor/ignition.htm
Interesting site with lots of DIY mods for small gas engines.
--


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On Wed, 24 Sep 2008 08:18:24 -0400, default
wrote:

On Wed, 24 Sep 2008 11:15:34 GMT, Ross Herbert
wrote:

On Tue, 23 Sep 2008 15:26:42 -0400, default wrote:

oes anyone have a schematic for a simple four pin HEI ignition module
:from 1970's+ ignition systems. They appear to contain an SCR and a
air of diodes and resistors.
:
:Pickup Coil connects to two terminals and battery and induction coil
rimary the other two, mounting screw provides a ground connection.
:
:Original type mounted to the distributor plate on GM cars and others
:and was ~1/4 round shape - I want to adapt it to a motorcycle that has
ickup coils mounted remote from the modules.



Most 70's era street bikes would run from the 12V battery supply so you would
have to buy a kit suitable for this power supply. I don't know where you are but
here is one kit http://www.jaycar.com.au/productView.asp?ID=KC5442

The bike is 80's runs from the battery. They call it a CDI but it
isn't - runs from 12V with no HT generator coil - the module just has
4-5 components in it (potted in black goo) induction coil is ~3.5
ohms.

[snip]

Doesn't take much to make a CD Ignition, see....

http://analog-innovations.com/SED/CD-Ignition-Basic.pdf

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine Sometimes I even put it in the food

On Wed, 24 Sep 2008 08:18:24 -0400, default
wrote:

On Wed, 24 Sep 2008 11:15:34 GMT, Ross Herbert
wrote:

On Tue, 23 Sep 2008 15:26:42 -0400, default wrote:

oes anyone have a schematic for a simple four pin HEI ignition module
:from 1970's+ ignition systems. They appear to contain an SCR and a
air of diodes and resistors.
:
:Pickup Coil connects to two terminals and battery and induction coil
rimary the other two, mounting screw provides a ground connection.
:
:Original type mounted to the distributor plate on GM cars and others
:and was ~1/4 round shape - I want to adapt it to a motorcycle that has
ickup coils mounted remote from the modules.



Most 70's era street bikes would run from the 12V battery supply so you would
have to buy a kit suitable for this power supply. I don't know where you are but
here is one kit http://www.jaycar.com.au/productView.asp?ID=KC5442

The bike is 80's runs from the battery. They call it a CDI but it
isn't - runs from 12V with no HT generator coil - the module just has
4-5 components in it (potted in black goo) induction coil is ~3.5
ohms.

[snip]

Doesn't take much to make a CD Ignition, see....

http://analog-innovations.com/SED/CD-Ignition-Basic.pdf

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine Sometimes I even put it in the food

On Wed, 24 Sep 2008 07:45:10 -0700, Jim Thompson
wrote:

[snip]

Doesn't take much to make a CD Ignition, see....

http://analog-innovations.com/SED/CD-Ignition-Basic.pdf

Thanks. What is the theory of operation? What I have now, connects
one side of the coil to the battery and the other side to the ignition
module. In that circuit, D3 D2 would stay forward biased if the coil
goes to B+.

This circuit is supposed to dump a largish negative spike to the coil?

What kind of voltage does the transistor have to stand off?
--


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On Wed, 24 Sep 2008 07:45:10 -0700, Jim Thompson
wrote:

[snip]

Doesn't take much to make a CD Ignition, see....

http://analog-innovations.com/SED/CD-Ignition-Basic.pdf

Thanks. What is the theory of operation? What I have now, connects
one side of the coil to the battery and the other side to the ignition
module. In that circuit, D3 D2 would stay forward biased if the coil
goes to B+.

This circuit is supposed to dump a largish negative spike to the coil?

What kind of voltage does the transistor have to stand off?
--


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---= - Total Privacy via Encryption =---

Life is like a roll of toilet paper; the closer it gets to the end, the faster
it goes.

"Ross Herbert" wrote in message
...
On Tue, 23 Sep 2008 15:26:42 -0400, default wrote:

oes anyone have a schematic for a simple four pin HEI ignition module
:from 1970's+ ignition systems. They appear to contain an SCR and a
air of diodes and resistors.
:
:Pickup Coil connects to two terminals and battery and induction coil
rimary the other two, mounting screw provides a ground connection.
:
:Original type mounted to the distributor plate on GM cars and others
:and was ~1/4 round shape - I want to adapt it to a motorcycle that has
ickup coils mounted remote from the modules.


Most 70's era street bikes would run from the 12V battery supply so you would
have to buy a kit suitable for this power supply. I don't know where you are
but
here is one kit http://www.jaycar.com.au/productView.asp?ID=KC5442

If your bike doesn't have a battery which is chaarged from an
alternator/generator then it will probably use an generator supply winding to
produce the input voltage. In this case a simpler kit can be used
http://www.jaycar.com.au/productView.asp?ID=KC5466


Here's a link to the Delta Mark 10 CDI.
http://www.selectric.org/delta/index.html
I used to have a couple of these units back in the day... sure saved points and
plugs after I installed them. Never had a moment's trouble from either of
them... built both from kits.

--
Dave M
MasonDG44 at comcast dot net (Just substitute the appropriate characters in the
address)

Life is like a roll of toilet paper; the closer it gets to the end, the faster
it goes.

"Ross Herbert" wrote in message
...
On Tue, 23 Sep 2008 15:26:42 -0400, default wrote:

oes anyone have a schematic for a simple four pin HEI ignition module
:from 1970's+ ignition systems. They appear to contain an SCR and a
air of diodes and resistors.
:
:Pickup Coil connects to two terminals and battery and induction coil
rimary the other two, mounting screw provides a ground connection.
:
:Original type mounted to the distributor plate on GM cars and others
:and was ~1/4 round shape - I want to adapt it to a motorcycle that has
ickup coils mounted remote from the modules.


Most 70's era street bikes would run from the 12V battery supply so you would
have to buy a kit suitable for this power supply. I don't know where you are
but
here is one kit http://www.jaycar.com.au/productView.asp?ID=KC5442

If your bike doesn't have a battery which is chaarged from an
alternator/generator then it will probably use an generator supply winding to
produce the input voltage. In this case a simpler kit can be used
http://www.jaycar.com.au/productView.asp?ID=KC5466


Here's a link to the Delta Mark 10 CDI.
http://www.selectric.org/delta/index.html
I used to have a couple of these units back in the day... sure saved points and
plugs after I installed them. Never had a moment's trouble from either of
them... built both from kits.

--
Dave M
MasonDG44 at comcast dot net (Just substitute the appropriate characters in the
address)

On Wed, 24 Sep 2008 14:36:05 -0400, default
wrote:

On Wed, 24 Sep 2008 07:45:10 -0700, Jim Thompson
wrote:

[snip]

Doesn't take much to make a CD Ignition, see....

http://analog-innovations.com/SED/CD-Ignition-Basic.pdf

Thanks. What is the theory of operation?

All of the control circuitry is not shown.

(1) Transistor turns on
(2) When current in inductor reaches 5A, transistor turns off, dumping
energy into capacitor (~350V)
(3) When transistor turns on again, capacitor dumps into ignition coil
(conventional ratio) firing plug; and inductor charging begins again.

Works great... I've used it to saw Plexiglas ;-)

What I have now, connects
one side of the coil to the battery and the other side to the ignition
module. In that circuit, D3 D2 would stay forward biased if the coil
goes to B+.

This circuit is supposed to dump a largish negative spike to the coil?

What kind of voltage does the transistor have to stand off?

I used 500V BVCEO (NPN) devices.

There are probably Power MOSFET's now that would work better... HV
NPN's have lousy beta, requiring beta correction circuits in the
current sensing.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine Sometimes I even put it in the food

On Wed, 24 Sep 2008 18:03:28 -0700, Jim Thompson
wrote:

Doesn't take much to make a CD Ignition, see....

http://analog-innovations.com/SED/CD-Ignition-Basic.pdf

Thanks. What is the theory of operation?

All of the control circuitry is not shown.

(1) Transistor turns on
(2) When current in inductor reaches 5A, transistor turns off, dumping
energy into capacitor (~350V)
(3) When transistor turns on again, capacitor dumps into ignition coil
(conventional ratio) firing plug; and inductor charging begins again.

Works great... I've used it to saw Plexiglas ;-)

What I have now, connects
one side of the coil to the battery and the other side to the ignition
module. In that circuit, D3 D2 would stay forward biased if the coil
goes to B+.

This circuit is supposed to dump a largish negative spike to the coil?

What kind of voltage does the transistor have to stand off?

I used 500V BVCEO (NPN) devices.

There are probably Power MOSFET's now that would work better... HV
NPN's have lousy beta, requiring beta correction circuits in the
current sensing.

...Jim Thompson
Thanks, I'll give it a try.
--


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On Wed, 24 Sep 2008 18:03:28 -0700, Jim Thompson
wrote:

Doesn't take much to make a CD Ignition, see....

http://analog-innovations.com/SED/CD-Ignition-Basic.pdf

Thanks. What is the theory of operation?

All of the control circuitry is not shown.

(1) Transistor turns on
(2) When current in inductor reaches 5A, transistor turns off, dumping
energy into capacitor (~350V)
(3) When transistor turns on again, capacitor dumps into ignition coil
(conventional ratio) firing plug; and inductor charging begins again.

Works great... I've used it to saw Plexiglas ;-)

What I have now, connects
one side of the coil to the battery and the other side to the ignition
module. In that circuit, D3 D2 would stay forward biased if the coil
goes to B+.

This circuit is supposed to dump a largish negative spike to the coil?

What kind of voltage does the transistor have to stand off?

I used 500V BVCEO (NPN) devices.

There are probably Power MOSFET's now that would work better... HV
NPN's have lousy beta, requiring beta correction circuits in the
current sensing.

...Jim Thompson
Thanks, I'll give it a try.
--


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On Wed, 24 Sep 2008 20:50:46 -0400, "DaveM"
wrote:



Here's a link to the Delta Mark 10 CDI.
http://www.selectric.org/delta/index.html
I used to have a couple of these units back in the day... sure saved points and
plugs after I installed them. Never had a moment's trouble from either of
them... built both from kits.

--
Thanks. This isn't something I can use on this bike - too large. I
did build two of these myself in the 70's one went on a BMW motorcycle
and the other a Land Cruiser.

I think Jim's circuit is more viable given the components we have
today - and my size constraints. (although I could run one inverter
to boost voltage for both spark coils then just double up the SCR cap
circuits).

Appreciate the feedback, and I'll save the schematic
--


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On Wed, 24 Sep 2008 20:50:46 -0400, "DaveM"
wrote:



Here's a link to the Delta Mark 10 CDI.
http://www.selectric.org/delta/index.html
I used to have a couple of these units back in the day... sure saved points and
plugs after I installed them. Never had a moment's trouble from either of
them... built both from kits.

--
Thanks. This isn't something I can use on this bike - too large. I
did build two of these myself in the 70's one went on a BMW motorcycle
and the other a Land Cruiser.

I think Jim's circuit is more viable given the components we have
today - and my size constraints. (although I could run one inverter
to boost voltage for both spark coils then just double up the SCR cap
circuits).

Appreciate the feedback, and I'll save the schematic
--


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---= - Total Privacy via Encryption =---

On Thu, 25 Sep 2008 09:08:09 -0400, default
wrote:

On Wed, 24 Sep 2008 18:03:28 -0700, Jim Thompson
wrote:

Doesn't take much to make a CD Ignition, see....

http://analog-innovations.com/SED/CD-Ignition-Basic.pdf

Thanks. What is the theory of operation?

All of the control circuitry is not shown.

(1) Transistor turns on
(2) When current in inductor reaches 5A, transistor turns off, dumping
energy into capacitor (~350V)
(3) When transistor turns on again, capacitor dumps into ignition coil
(conventional ratio) firing plug; and inductor charging begins again.

Works great... I've used it to saw Plexiglas ;-)

What I have now, connects
one side of the coil to the battery and the other side to the ignition
module. In that circuit, D3 D2 would stay forward biased if the coil
goes to B+.

This circuit is supposed to dump a largish negative spike to the coil?

What kind of voltage does the transistor have to stand off?

I used 500V BVCEO (NPN) devices.

There are probably Power MOSFET's now that would work better... HV
NPN's have lousy beta, requiring beta correction circuits in the
current sensing.

...Jim Thompson
Thanks, I'll give it a try.

Thoughts coming back to me... with a conventional ignition coil (from
a car points-type system), peak primary current was 11 Amps! So size
your MOSFET accordingly.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine Sometimes I even put it in the food

On Thu, 25 Sep 2008 08:16:16 -0700, Jim Thompson
wrote:

Thoughts coming back to me... with a conventional ignition coil (from
a car points-type system), peak primary current was 11 Amps! So size
your MOSFET accordingly.

Coil resistance is 3.5 ohms, that's only 4 amps.
--


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On Thu, 25 Sep 2008 12:08:22 -0400, default
wrote:

On Thu, 25 Sep 2008 08:16:16 -0700, Jim Thompson
wrote:

Thoughts coming back to me... with a conventional ignition coil (from
a car points-type system), peak primary current was 11 Amps! So size
your MOSFET accordingly.

Coil resistance is 3.5 ohms, that's only 4 amps.

When hit with 350V ?:-)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine Sometimes I even put it in the food

On Thu, 25 Sep 2008 09:23:10 -0700, Jim Thompson
wrote:


On Thu, 25 Sep 2008 12:08:22 -0400, default
wrote:

On Thu, 25 Sep 2008 08:16:16 -0700, Jim Thompson
wrote:

Thoughts coming back to me... with a conventional ignition coil (from
a car points-type system), peak primary current was 11 Amps! So size
your MOSFET accordingly.

Coil resistance is 3.5 ohms, that's only 4 amps.

When hit with 350V ?:-)

...Jim Thompson
Oh.
--


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On Thu, 25 Sep 2008 12:39:44 -0400, default
wrote:

On Thu, 25 Sep 2008 09:23:10 -0700, Jim Thompson
wrote:


On Thu, 25 Sep 2008 12:08:22 -0400, default
wrote:

On Thu, 25 Sep 2008 08:16:16 -0700, Jim Thompson
wrote:

Thoughts coming back to me... with a conventional ignition coil (from
a car points-type system), peak primary current was 11 Amps! So size
your MOSFET accordingly.

Coil resistance is 3.5 ohms, that's only 4 amps.

When hit with 350V ?:-)

...Jim Thompson
Oh.

Yep! You missed that the cap acquires charge when the inductor dumps
:-)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine Sometimes I even put it in the food

hi, this any help to you ??
mark k



"default" wrote in message
...
Does anyone have a schematic for a simple four pin HEI ignition module
from 1970's+ ignition systems. They appear to contain an SCR and a
pair of diodes and resistors.

Pickup Coil connects to two terminals and battery and induction coil
primary the other two, mounting screw provides a ground connection.

Original type mounted to the distributor plate on GM cars and others
and was ~1/4 round shape - I want to adapt it to a motorcycle that has
pickup coils mounted remote from the modules.
--


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News==----
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Newsgroups
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