All posts by RabidProto

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Positron Thrower Install

Hey guys,

Just thought I’d post some photos of what it looks like when you install the Positron kit in your thrower:

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Note that this install was an upgrade, so I used the original switches that were already in place with their original wires.  I know many of you will be upgrading, so I used the same type of connectors for those.  The LEDs you’ll want to replace, since the new ones are soldered onto the wires instead of being in those sockets that they would often fall out of.

Also note that this install includes the optional super bright grille light.  Normally, I would recommend you find or make some kind of reflector to put in the grille to protect the electronics from the elements but here since I was pressed for time, I just installed it on a little plastic tab by the vibration motor that I attached with double sided foam tape.

In addition, I’d like to point out the screw that is holding the rear handle in place.  Your thrower may not have a screw there, but you should take note of any metal bits that may come into contact with the PCBs.  In this case I had to trim that screw to make it shorter and then I put a couple layers of tape over where it is inside the handle because the extension module that connects to the Cat5 cable and provides connections for those white flat flex cables and the super bright grille light sits inside the handle.  Alternatively, I could have gotten some large diameter heat shrink and heat shrunk that module but that would have made it impossible to unplug any of the cables from it later.  If you have a metal thrower I suggest using two layers of double sided foam tape to protect the underside of the PCBs.  I have used that here to attach the boards to the sides.

Finally, I’d like to draw your attention to the strobe at the front of the thrower.   You can see there’s some slack in the cable even with the switch module that it connects to all the way at the rear of the thrower so you can remove the tip and unplug it if need be.  The strobe should be placed flush against the rear of the acrylic tube, or the metal ring that holds it in place in the end of the handle.  It can be glued in place, or you can simply tape it in place, unless you have a tip extension mechanism in which case glue would probably be best.  For maximum brightness, make sure you don’t push the acrylic tube way into the handle with the strobe on the end of it.  You want the strobe to be as close to the end of the handle as possible, and that’s when it’s butted right up against that metal ring.

You may also have noticed the acrylic tube here is much shorter than usual.  Yours doesn’t need to be that short – that’s just how the owner of this pack likes it!

Oh, and the strobe is slightly smaller than the diameter of the acrylic tube, so if you have a tip extension mechanism with a metal tube that slips over the acrylic tube the strobe should fit inside it, no problem.

Positron Sneak Peek!

Hey guys,

The real demo will be coming Friday next Wednesday, but to tide you over till then I recorded a short clip showing off the Party Mode!

Apologies for the poor video quality; it was an overcast morning when I shot it and I didn’t want to waste too much time on this video when I would be shooting a new one in a couple days with the kit installed in a pack.

Positron – Cyclotron LEDs

Just a quick update to let you know that work on the Positron is progressing well, and I expect to release a video of it in action later this week!

In the meantime, here are some beauty shots of the new RGB LED cable for the color changing cyclotron:

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And a shot of the vibration motor and volume pot:


Note that the volume pot can be installed in the thrower or pack.  Here it is pictured connected to the thrower’s switch module.

If installing the volume pot in the thrower it will be up to you to figure out the knob arrangement for it.  You could for example install it in the knob next to the Clippard, but chances are you’ll have to shorten the plastic pot shaft and machine that knob to add a set screw.  And if you’re installing it on any of the side knobs, then the pot shaft would have to be really short.

It’ll be much easier to install the pot in the pack shell, either on the crank knob or motherboard.  I will be offering extension cables for it as well in case you need one.

Oh, and the vibration motor will come with a little adhesive mounting clip so it is easy to install.


Which battery should I use?

As with speakers, I’m often asked what the best battery to use with my proton pack kit is.

The proton pack kit requires around 12V to function.  A little less, or a little more is okay, with a 14.4V battery pack being the absolute recommended maximum.  (The true maximum is actually a bit higher than this, but a 14.4V lithium pack won’t exceed that.)

Is there any advantage to more voltage?  Well, not really.  The gain on the amplifier is set such that over 12V the audio will begin clipping, so while it might sound a bit louder the audio quality will be somewhat reduced.  So for that reason, I recommend a 12V battery pack.  I designed the kit for 12V because 12V battery packs are extremely common, while higher voltage packs are more expensive and hard to come by.   And the e-cig foggers that Fincher & Son sell for use with my kits are also designed to run at 12V and higher voltages will likely damage them.  So for everyone’s sanity, stick to 12V.

Now there’s a lot of options available for a 12V supply, but the most common are lithium-ion aka “lipo”, alkaline, or lead acid.

The disadvantages of alkaline and lead acid are that they’re extremely heavy.  Alkaline also has a high internal resistance which means the voltage droops when the amplifier in the kit tries to draw a lot of current.  This kills the bass.  And of course you can’t recharge alkaline, so C cells will last you a few hours, and D cells a couple days and then you have to replace them.  And the voltage also drops as they discharge so the pack will get quieter over time.  And lead acid, well because they’re so heavy I don’t recommend them at all, but they can source plenty of current and have high capacities.  You’re on your own finding a charging solution if you choose that route, but it shouldn’t be too hard to get a charger since you can find them on the shelf at any auto parts store or Walmart.

So the battery I recommend for use with the packs is lithium-ion.  Li-ion batteries have high capacities, can source large amounts of current, are very lightweight, and can be recharged easily; if you get the right li-ion battery pack.

Now, you may have heard of lipo batteries for remote control vehicles, and those are fine, but as they’re designed to supply huge amounts of current far in excess of what my kit requires, they can be a pain to charge and maintain.  They have no built in protection circuits for overcharging or over discharging, and either of those can be dangerous and either cause a fire, or kill the battery.

So I recommend you stay away from those, and instead look at what are known as power banks.  Power banks are often used for charging cellphones, or powering laptops and cctv cameras.   The ones for laptops and CCTV cameras are the sort you’re looking for, because they’ve got a 12V output with a 5.5×2.1mm barrel jack on them, and they are capable of sourcing 2-3A continuously, which is the minimum required for the kit.

Power banks vary widely in capacity and price though.  You will want one that’s at least 6000mAh for the proton pack kit, though 3600mAh or 4800mAh may be sufficient for many.  6000mAh will give you 1A on average for 6 hours, or 500mA for 12 hours.  The average current draw of the kit is going to be closer to the latter, though how much it actually draws depends on if it’s playing music and how loud it is, which also depends on if you’re running with one or two speakers; so it’s impossible to provide you with an exact number.  But with a 6000mAh battery, you should be fine all day at a con, and you can charge it in 6 hours overnight.

There is one problem with power banks though, and that is that there are a LOT of super cheap ones out there that are made in China that have fake specs, and use recycled batteries.  Recycled lithium batteries are bad news.  Friends of mine have had multiple packs die on them, and in pulling them apart and testing them I’ve found that one or more of the three pouch cells in the batteries they bought were dead, and that the batteries were manufactured five years ago, and that the 9800mAh power banks they were sold were actually more like 3600mah.  I also know of one individual who had one of these cheap battery packs spontaneously catch fire.

A cheap battery pack made in China using old recycled batteries, with two pouch cells of the type it contains sitting next to it. Typically wrapped in blue tape, though sometimes they come in black plastic enclosures that are nearly indistinguishable from the real deal until you hold it in your hands and find it weighs next to nothing and the power switch is loose. These batteries also often come with chargers that put out far too little current resulting in the batteries taking days to charge instead of hours. If your charger says 150-250mA output instead of 1A then it’s too small! But whatever you do, don’t swap your charger for an ordinary power brick to try charging faster! They look the same, but only one labeled “li-ion charger 12.6V” has the circuitry to safely charge the battery to the correct voltage and limit the current properly!

So how can you avoid getting one of these bad recycled batteries?  Good question!  You could avoid them buy buying one of the expensive name brand power banks on Amazon, but who wants to spend $65 on a battery just because it says Energizer on the front and has a fancy enclosure you’ll never see inside the proton pack?

Thankfully, I’ve done the legwork for you!  At least for those of you in the USA or who can purchase from Amazon.  If you’re outside the US  you can try to find the same manufacturer, but don’t assume that just because a battery on ebay has a black case like this, that it’s good.  There are a lot of fakes built just as badly as the blue bricks above.



Here’s the link to purchase this battery:

How do I know this is a good battery?  I disassembled it!

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You can see this battery is well built!  Thick metal tabs connect the over current/discharge protection + balance charging circuit to the batteries, and the circuit itself looks to be of very high quality construction.  And unlike the blue brick, this power bank uses cylindrical cells instead of pouch cells.  These 18650 cells are very common, and have some safety features that the lighter more compact pouch cells don’t.  I personally have not heard of these type of cells swelling up or catching fire.  Also, check out that date code: 2016-03-03.  March 3rd of this year!  These batteries were made only two months ago!  No recycled crap here.

Unfortunately I can’t tell by the numbers on the cell what its capacity is, so there’s no way to know if I was cheated on that, but based on the number of cells and the minimum capacity you can get these cells in, there should be at least 4800mAh in there, and based on how long the pack took to charge with the 1A charger they supplied, the advertised 6000mAh is probably accurate.

This power bank unlike the blue batteries doesn’t have two cables coming out of it, but it does come with a Y adapter cable that serves the same purpose:


And here you can see how you would connect the charge port and power switch harnesses for the proton pack kit to the battery:


Finally, if you must order a battery from ebay, then I would look for one with screws on the back like this one.  Screws on the back means they aren’t trying to hide what’s inside.  And it means you can check to see what’s inside.  You could also ask the person selling the pack if it contains 18650 or pouch cells and if they are new.  Pouch cells aren’t necessarily bad if you know you’re getting new ones.  I just suggest trying to avoid them because it seems like all the fake batteries use those because those are what are found in most used cellphones and laptops and other used electronic devices.  The 18650 cells are most often used in power tools, and nobody throws those  out until they’re good and dead.





Positron Prototypes!

Fresh off the presses from Macrofab, the prototypes for my Positron Proton Pack Kit arrived this weekend!

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Video of it in action will be forthcoming, just as soon as I can port all the code from the original kit over to it.   A short video demoing the bargraph and sound should be soon-ish as I’ve already ported that code, but the rest will probably take a couple weeks.

“What speakers do you recommend?”

I often get asked:

“What speakers do you recommend for your Proton Pack kit?”

For my kits,  I recommend one or two 4 ohm car speakers wired in parallel.  Each 4 ohm speaker will output 20W,  and the amplifier in my kit can deliver 40W in total.

If you use 8 ohm speakers, or wire your 4 ohm speakers in series, they will each output half the power and your volume will be halved, and you would be adding extra weight for nothing.

There is typically room in the pack under the cyclotron for a 6.5″ or 6×9″ speaker, and by the powercell there is room for a 4″ speaker.  A 5.25″ speaker may fit near the powercell however if you face it towards the motherboard, but in this case it would be wise to drill some holes or install a grille to allow the sound to escape.

Other considerations:

  • A bigger speaker = louder + more bass, but also more weight.  6×9″ speakers are MUCH heavier than 6.5″ speakers.
  • Every 3db increased sensitivity = double the volume!
  • A wide frequency response is desirable, and 2-3 way speakers for cars come with a built in tweeter or two which makes them ideal.

As for specific recommendations, I used to recommend the Pyle Blue label, as they are low in cost and are among the highest in sensitivity, but the ironically named Phantom Boss Ghost series in the same price range appear to be slightly better.

The Boss Phantom Skull are also good, and appear to be identical to the Ghost and come in a few sizes the Ghost does not, but they have red LEDs on them that are synchronized to the music. You could paint over the LEDs or cover them in tape, but the most obvious exposed wires leading to them also power the tweeter and the wires that go to the LEDs are tucked in under the tweeter and very hard to get at.

If money is no object, I might try to squeeze a 6.5″ and 5.25″ speaker in there. If money is an object, or weight is an issue a single 6.5″ speaker would be adequate, and you could sell the spare since they’re sold in pairs, or a pair of 5.25″ speakers might be a good choice.  If money and weight are no object, a 6×9″ speaker and 5.25″ speaker would be the loudest. But proton packs are heavy as it is, so a single 6×9″ speaker may be a good compromise for weight and loudness. It’s really up to you.  There is no best option!

Most in the past I believe have gone with a single 6.5″ speaker, and those that want more have been using a 6.5″ and 4″, but I’m not sure the 4″ is really worth it after installing one in my friend’s pack that I use for demos.  I didn’t drill holes in his motherboard for it though.  A properly installed 5.25″ would certainly be an improvement however!

Positron Prototypes Ready for Manufacture!

Finished the last of the design work on the Positron Proton Pack kit today!

Switch Module
LED Module
Extension Module – Connects to CAT5 cable and fits inside thrower handle.
RGBW Strobe – Color changing main strobe for both proton pack and trap kits.
White Strobe – Used for grille light upgrade and/or n-filter, and can be added to trap kit .
Trap Kit Bargraph – A variation on the normal bargraph which may or may not feature in the final kit. Only difference is it includes a location for one extra LED.