Re: pinball SCHOOL project HELP!!!! flipper voltage

On Dec 10, 9:21 am, gangstarr <who_...@xxxxxxxxxxx> wrote:
CLAY-
BTW- what is the proper wiring on those coils?
as i lift the playfield and see the coils in the game, from left to
right i have the left lug being ground and the middle lug being the
power input from my supply. i was not using the right lug.

i want to use all 3 properly with the EOS switch and i assume after re-
reviewing yor other post that the EOS switch is nc.
is this correct?



in class we have to build and program an item using an atmel 8538
microprocesor.

i made a pinball machine.
ive got the machine built. the playfield is about 2 feet deep by 1
foot wide.
i am using the flipper assemblies from an bally eightball.
those flippers use 43 volts i beleive in eightball.
we use 12 volts supplies going into out atmel board and use a 7805 to
knock it down to +5 vdc.

so i got to run a different power supply to the flippers.

what im doing is, running the power from the "flipper power supply"
directly to the flipper switches, then from the switches to the
flipper coils. the flipper switches are kinds liek light switches in
effect.

im using a power supply and provide the voltage required, but its a
current limiting power supply in my class.
if i move the flippers up manually with my finger about half way the
coil plunger will finally engage strong.
it will not move the flippers from normal position thow. the power
supply "clips"
i tried another supply there ( a beefier one) and it does the same
thing.
how much current do flippers need?

the flippers are the only part of this project holding me back. ive
got g.i. lights, led lights when switches are hit (stand up targets)
etc.
its pretty cool looking and everyone in the class is geeked about it
saying its the best project in the class (we all chose what we wanted
to do).
so, help me so i can put pinball on the college map and win the best
project and get an "A" in the class:).
will post pix of this soon as well.

It really sounds like you have the flipper coil wired
incorrectly. I assume you are using an EOS switch
and are powering the high-powe side of the flipper
coil, with the low power side being shorted out
by the EOS switch. as the flipper reaches end of
stroke, the EOS switch opens so both sides of
the coil (hi and low power) have power, raising
the total coil resistance. this allows the coil to be
held without burning it.

what it sounds like is the low power side of the
flipper coil is not being shorted out initially,
and there isn't enough power to pull the flipper
with any force.- Hide quoted text -

- Show quoted text -

You gotta use the EOS switches. If you wire just the low power side
(like it sounds like you have) you won't get power. If you wire only
the high power then if someone holds the flipper button in you will
burn the coil. The smoke won't be good for your grade!

You can see which is which by measuring the resistance. The high
resistance is the low power side and the low resistance is high
power. The high power side should be somewhere around 3 ohms. The
switches should be in the high power side of the circuit.

When someone initially hits the button BOTH circuits will have power
sent to it. But since electricity takes the path of least resistance
all of the current will go through the LOW resistance, HIGH power,
path. Once the flipper is raised the EOS switch is opened and now the
current MUST pass through the HIGH resistance, LOW power circuit.

I helped my son with a mini pin for a science project and we made it
work. It was a good lesson for him. We ran ours on a 12v garden
tractor style battery (high current) and it worked good.

Parker

My guess is those are normally closed.
.

Relevant Pages

  • Re: Tech: 76 Bally Hi Deal - left flipper blows fuse
    ... The flipper coil is actually two coils connected in series. ... is a larger gauge wire and has less turns. ... flipper coil through the EoS switch and the cabinet flipper switch to ...
    (rec.games.pinball)
  • Re: uh, capacitors? (WMS Sys 11)
    ... upper flipper can make the ramp shot, but I want to change both remaining ... coil, but did NOT add the capacitor! ... The new pawl barely touches the EOS switch. ...
    (rec.games.pinball)
  • Re: uh, capacitors? (WMS Sys 11)
    ... upper flipper can make the ramp shot, but I want to change both remaining ... coil, but did NOT add the capacitor! ... The new pawl barely touches the EOS switch. ...
    (rec.games.pinball)
  • Re: Flippers just stopped working on Sorcerer
    ... All three flippers are one the same fuse so if one bad flipper can take ... have a bad flipper coil too. ... On a System 9 you can blow a fuse if the EOS switch is bad. ...
    (rec.games.pinball)
  • Re: Addams Family upper right flipper circuit question
    ... Your game will tell you the transistor numbers. ... Go into flipper test, then ... but the "power" circuit doesn't. ... replaced at some point with the incorrect coil. ...
    (rec.games.pinball)