ATOM Diy module

[JackieTreehorn]

I would like to try building an ignition module using an SCR, here is my design. I would appreciate any input on this design

 

[debe]

Im not a design engineer, so cant realy help you. What i presented was a reverse engineereed Atom transistor driven ignition module. i had enough trouble by trial & error finding a suitable ignition transistor to work reliably.

 

[ColonelM]

Hey, JackieTreehorn... Did you build that SCR module? How did it turn out?

 

[rigmo]

Hi
Can we use replacement - equivalent for 2SD1071 ⇒ 2SD1245 2SD798 U910 (BU910...912, 2SD798...99, 2SD1245
BU910* KT812B*) ?
and has anyone tried mosfet

 

[debe]

Havent bothered to try any equivalent transistors or mosfet, as i have about 20 2SD1071 transistors. So at the age of 73 yrs i dont think i will need any more.

 

[ColonelM]

Hello debe! Have you any thoughts on Mr. Notaras' 1992 patent update for the ATOM circuits... here: https://patents.google.com/patent/US5111798A/en ?

 

[rigmo]

I'm interested in making an SMD version .. what type of capacitor do I need? is good ceramic MLCC 470nF? I find also SMD 2W 1.2 1.5kohm

 

[ColonelM]

Atom units were semi-SMD per pictures? Discrete transistors with SMD resistors? Not sure about the capacitor. I am curious to hear about equipment to make SMD assemblies. Also also Debe... how does one remove plastic shell from an Atom unit without wrecking the circuit board? Is the circuit functional after plastic is stripped?

 

[debe]

I used a soldering iron to carefuly remove the plastic on the Atom module. Once the components were exposed the module worked fine. Since the original module works fine on the 4 engines i have them on ive left it at that.

 

[rigmo]

SIR DABE
I'm interested in making an SMD version .. what type of capacitor do I need? is good ceramic MLCC 470nF? I find also SMD 2W 1.2 1.5kohm

 

[rigmo]

Hi I just recived parts.. MOQ... ill try make two to see if its work... in next few days i make pcb
question... bc337 can be repalced with BC817?