(Topic ID: 273083)

Not another Bally -18 Power supply.... YUP!

By toddsvec

3 years ago



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    #1 3 years ago

    Hey guys! Happy to reveal this today, a Bally/Stern power supply (-18 & TA-100 games) that requires no soldering to the transformer. Even though it's Rev B, changes are being made to improve it. Give me some feedback! Happy to answer questions.

    ebay.com link: itm

    XP-BLY2518-18 (resized).jpgXP-BLY2518-18 (resized).jpgXP-BLY2518-18-installedWithText (resized).jpgXP-BLY2518-18-installedWithText (resized).jpg
    #4 3 years ago
    Quoted from Zitt:

    Some constructive advice / questions since you asked for feedback...
    1) Why put leds under the fuses ... but not provide LED indicators for the test points?
    2) Why provide Test pads; instead of actual test points with components so people can connect a alligator clip and not deal with probes slipping?
    This is especially true for the GND connection!
    3) Those Bridge Rectifiers look tiny. Are you provoding cross references to those components so they can be replaced later 40 years from now?
    4) Are there large vent holes under those power resistors to facilitate cooling? IF not; why not? Are the power resistors mounted above the board - again for same reason?
    5) Those transformer connections look fragile. Are they screw based or some other retention mechanism?
    6) Are you providing downloadable schematics? Again for a second/third/fourth owner who needs to repair your replacement board?

    The input is appreciated, and valuable. Thank you. Three of us discussed and I tried to make it less technical & wordy.

    1. The LED under the fuse is an indicator that the FUSE is good. If the LED is at the test point, you have to go hunting for which fuse. In the past, the only way to test a fuse is to take it out and measure it. LED at the test point requires you to work backwards and figure out which fuse number goes with that test point. Let me give an example, say GI is out and you look at the P/S and F5 LED is not lit. First thing to try is another fuse usually, and if it blows you know you probably have a shorted lamp socket. I myself would unplug J1 and J3, and if the fuse doesn't blow, you know the problem is not the P/S board.

    2. Time and money. You can actually clip a lead to one side of the resistor, future versions will have that marked, or an actual ground point added.

    3. They are smaller but are better than OEM, and even right now there are up to 50 suitable replacements out there. The first bridge will be changed in the next revision as -49 games were overlooked and require higher amps, but with LEDs, the draw on this bridge is less.

    4. Isn't necessary. To my knowledge no one else is elevating, or providing holes, and looking at probably 50+ original boards, these don't get hot enough to be a worry. There are only 3 watts of power dissipated by the 10W resistor and less 1.5W of power dissipated by the 5W resistor. They will get hot, but won’t damage the circuit board. If the 10W resistor was replaced by a 3W resistor it could damage the board because the heat would be concentrated in a smaller area (due to the smaller resistor package). That being said it's noted and being looked at.

    5. Common retention connection terminals. Retention mechanism is a spring loaded barb. Widely used in various industries for low/high voltage system interconnects. Personal experience is that the connection has been subjected to UL required pulls of 5lbs of force. It's not a connector made to have a lot of cycles, but for most instances, once installed, it's unlikely it'll be uninstalled.

    6. Not for awhile. It makes sense in a couple years, but not immediately to make it easier for others to copy ideas. Many repairs on relatively simple boards like this can be done without schematics because parts are easily identifiable.

    A little bit of irony in this board, it's main feature is being solderless, at the same time, we've developed another board under the Big Daddy Enterprises name and research has taught us a lot!!! Many boards out there, most really, don't properly address everything like they should. The XPIN was in development before the BD one, and we like to think they attract two types of customers. The BD is being built as we type, and here's a sneak peek:
    BD-18-49-100 (resized).jpgBD-18-49-100 (resized).jpg

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