ATOM Diy module

K

KeepItSimpleStupid

Well-Known Member

Most Helpful Member

• Sep 14, 2017

• #81

The KIT generally consists of an (electrical insulator/thermal conductor), a Belleville domed washer, a shoulder washer a machine screw and a nut.
A "shoulder washer" is shown here: https://www.biscoind.com/RAF/5745-N-250-125-144

It's designed for a heat sink such as: https://www.mouser.com/ds/2/303/sink_ex-1076311.pdf

You can blind tap a hole in thick material if required. "blind tap" - A tapped non-thru hole. They are harder to do.

I don't know what your options are.

 

K

KeepItSimpleStupid

Well-Known Member

Most Helpful Member

• Sep 14, 2017

• #82

tysman said:

Would like to use same hole in transistor to mount to aluminum heatsink and to metal of saw

Click to expand...

Use a longer screw. The "heat sink" aluminum would have a clearance hole for the size as the screw. The screw could be longer if need be.

 

T

tysman

Member

• Sep 16, 2017

• #83

K thanks

 

T

tysman

Member

• Sep 18, 2017

• #84

i used an ST901T in one of my modules works great lots of rpm in my chainsaw so as an alternative it will work in place of D1071

 

debe

Active Member

• Sep 18, 2017

• #85

Thanks for that feed back on a successful replacement transistor.

 

T

tysman

Member

• Sep 18, 2017

• #86

yup specs on it to says made for ignition systems like chainsaws, lawnmowers, etc. says its rugged to

 

T

tysman

Member

• Sep 20, 2017

• #87

Made a module for a buddies saw and for some reason had to switch wires around do I leave the spike protector the same or do I flip it to. Also noticed that it reads a resistance of 3.10 both ways normally diode should only read 1 way.

 

T

tysman

Member

• Sep 21, 2017

• #88

also spark on module is weaker then points which seems weird

 

debe

Active Member

• Sep 21, 2017

• #89

You have a problem some where. The diode out of circuit should read about 20 ohms one way & infinity the other. As an assembled unit mine read 20 ohms one way & 90 ohms the other way.

 

T

tysman

Member

• Sep 21, 2017

• #90

when i hooked module up to saw there was a faint spark when i hooked gnd up did i damage module? and thats why spark is weak and weird readings on diode? the saw runs with wires switched seems like no top end but i do have wrong plug in engine which makes difference

 

T

tysman

Member

• Sep 21, 2017

• #91

also im using a DPDT switch so can switch from points to module with switch 1 way module is in use and points disconnected and with switch other way then points in use and module disconnected the coil is middle pin on switch. if i damaged something on module to make spark weaker what should i change or check on module?

 

Last edited: Sep 21, 2017

T

tysman

Member

• Sep 21, 2017

• #92

Looks like everything is fine soldered new transistors in same outcome um so for some reason wants to run with wires switched do I leave the diode alone or switch it to? Also the points side is still stronger more rpm then module. I'm thinking timing related this flywheel has tighter gap on magnets

 

Last edited: Sep 21, 2017

debe

Active Member

• Sep 21, 2017

• #93

Have you wired the spike protector to the module around the wrong way? Perhaps post pictures of your module.

 

T

tysman

Member

• Sep 21, 2017

• #94

Spike protector is same way as your diagram I just switched wires. Timing seems off no top end

 

T

tysman

Member

• Sep 21, 2017

• #95

Any sorta timing adjust with resistors to make spark hotter or increase in rpm?

 

debe

Active Member

• Sep 21, 2017

• #96

Not that I know off. But some pictures of your module & the chainsaw flywheel & Coil might be of some help.

 

T

tysman

Member

• Sep 21, 2017

• #97

OK I will take pic of flywheel and coil.

 

T

tysman

Member

• Sep 22, 2017

• #98

Here's flywheel

**broken link removed**

 

Last edited: Sep 22, 2017

T

tysman

Member

• Sep 22, 2017

• #99

those Nova Modules i dont think have timing resistors what would happen if it was just the switching transistor and the bc337. i have a pic of a blue coil taken apart and those 2 components where only thing inside no caps or resistors

 

T

tysman

Member

• Sep 22, 2017

• #100

cause gap in flywheel is slightly tighter i think i need to retard timing by a little is this correct?