(Topic ID: 252352)

Transistors in EM games

By MarkG

3 years ago

Topic Stats

  • 5 posts
  • 3 Pinsiders participating
  • Latest reply 7 months ago by MarkG
  • Topic is favorited by 2 Pinsiders


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Top Ten Photo cell (resized).jpg
0Gtb-300-Work-5 (resized).jpg
0flippermarkt-Gtb-300-pic-02 (resized).jpg
Grand Prix Delay relay (resized).jpg
FanTasTic Electronic Delay Timer (resized).jpg

#1 3 years ago

A recent comment on facebook mentioned a transistor in an EM game. I hadn't seen one before so I checked and sure enough Williams Fan-Tas-Tic uses a transistor in a delay timer:
FanTasTic Electronic Delay Timer (resized).jpg
Diodes are commonly used in rectifiers to create DC voltages from AC but I hadn't seen a transistor before in an EM game. Were they used in other games?

This circuit is a delay timer. Gottlieb used a similar circuit with a capacitor and diode in games like Flip A Card. Bally used a clever delay circuit that relied on a 455 flasher bulb to provide the delay. Did Williams use a delay circuit before this one without the transistor?

Inquiring minds want to know...


#2 3 years ago

I think grand prix has a similar delay circuit. Later though...

#3 3 years ago

Grand Prix does have a Delay relay (upper left in the schematic below) but it uses a capacitor-diode circuit similar to the one Gottlieb used.
Grand Prix Delay relay (resized).jpg
Interesting that Grand Prix is several years after Fan-Tas-Tic but doesn't use the transistor. I wonder if the circuit requirements were different or if they leaned away from transistors in the end?

#4 3 years ago

Hi Mark
funny - You and I did at almost the same time write about "diodes, capacitors, resistors" --- here https://www.flippermarkt.de/community/forum/threads/firecracker-von-bally-wer-erklaert-es-mir-warum-sind-kondensator-diode-und-widerstand-verbaut.212060/ in post-2 You can see "my JPG" - Gottlieb Super Soccer and Williams Grand Prix. The OP did encounter in his Bally Firecracker diode - capacitor - resistor and did ask about.
In 2017 in the german forum there was a topic about "Mystery bonus on Gottlieb 300" - I show JPGs from there.

I am not happy with the name "Delay-Relay" - I would prefer "Relay that automatically shuts-off after some time has elapsed".

The transistor in Fan-Tas-Tic is a switch --- as long in time a little bit of DC is flowing from the capacitor downwards - through the transistor - then to the left and upwards (in the JPG in post-1) --- as long in time the "switch (is transistor)" is kept open so current can flow "Coil on Delay-Relay to the left, through "switch (is transistor)" - then to the left and upwards.
Maybe (maybe ?) the Fan-Tas-Tic solution was made as they were asking an electronics engineer (state of the art) --- then they learned "we can make it less costly - without the 'transistor is a switch' ". Greetings Rolf
0flippermarkt-Gtb-300-pic-02 (resized).jpg0Gtb-300-Work-5 (resized).jpg

2 years later
#5 7 months ago

I discovered that Chicago Coin's '75 Top Ten and Gold Record use a photo cell, I think to detect when the record on the playfield spins:
Top Ten Photo cell (resized).jpg

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