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(Topic ID: 115544)

STTNG start mission hole DIY mod fail

By archaik

5 years ago

Topic Stats

  • 8 posts
  • 5 Pinsiders participating
  • Latest reply 5 years ago by archaik
  • Topic is favorited by 1 Pinsider


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#1 5 years ago

Hi guys,
i finished my complete teardown/rebuild of my STTNG playfield and just wanted to add a simple mod.

idea is: to light the start mission hole with a green flex head led, at the same time as the start mission arrow is lighted.

so i simply soldered 2 wires from each side of the pcb lamp to the flex led.(parallel circuit way)

result is : only the led lights up

conclusion: my design is flawed

anyone care to help me understand this one ? it's pretty cool having the green light from the hole but the dead arrow up front is annoying

#2 5 years ago

I think you need a diode on that light, right?

#3 5 years ago

hum makes me think that since its a controlled lamp yeah you might be right thx!
i'll have a look at the manual to see how the pcb is designed and maybe reproduce the same schema.

anyone else would like to confirm that ?

#4 5 years ago


This way you shouldn't need an extra diode, but does it work if you replace the incandescent with a LED ?

#5 5 years ago

Your LED might have a fixed drop voltage that's lower than what the lamp requires, or if it's not just an LED you may have created a shunt. I would suggest using matched lamps or LEDs for the insert and hole mod as it'll be a lot easier to maintain and/or debug if you end up selling it. Can you provide a link to the data sheet on the component you used?

#6 5 years ago

thanks for all the replies

@Law i don't know the led reference so i can't produce the datasheet, it's a standard 1SMD 44base flex led i bought from a french vendor.(i'll see if i can contact him to have the datasheet but i'm not optimist about that)

I'll try to put in 2 lamps see what happens

@zaza i think that is the circuit i made , i'll double check when i get back from work, see if the diode is after the 2 lamps.

#7 5 years ago

When doing this type of mod for a controlled light as opposed to a GI, and if it's a socket 555 that you are trying to hook it up to, take out the twist socket, and solder the wires directly to the tops of the taps that make contact when the socket is twisted back into the PCB (soldered wire is on the other side of the tab as to what makes contact with the contact point on the PCB).

This is a clean way to do it, any issues with overheating or hacking is done to the cheap plastic twist socket and not the board, and it ensures you are behind the diode for the controlled light.

#8 5 years ago

@atomicboy that is a brilliant idea !
i didnt quite exactly do that (soldered wires directly on the pcb where the twist socket makes contact )
your way is better, i should do that next time, because you dont actually hack the pcb just a socket.

Sooooooo there wasn't any problem in fact, i just checked everything and

wait for it.......

it was just that the lamp in the twist socket was old and not making good contact so it was OFF
must have moved a bit since i tweaked things here and there and voila
=> so socket + lamp cleaned and retightened and everything is fine now both led and lamp light up

yeahhhhhhhhhh first mod ever

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