Available at eBay

If you can’t find a particular kit, at my eBay store, I’m temporarily out-of-stock, of that item. I only list items, that are kitted and ready to ship. I have a good supply of PCBs, and parts in my inventory, so the item should be relisted, in well under a week.

(click on kit of interest, to read more)













These are “electronic kits” that contain the printed circuit board (PCB) and most of the components needed to complete the project. They require assembly by the buyer. Tools needed for assembly, include a soldering iron, and solder, in addition to needle nose pliers, and diagonal cutters (aka dikes) .


Most of my kits involve older tube technology, as part of the kit. Mostly nixie tubes and dekatron counting tubes. These tubes are not included in the kits, and must be purchased separately, from other vendors. One exception, is the NT2ZA thermometer kit, which is shipped with ZM1000 nixie tubes, which I have in limited supply.

Warning, most of these kits, generate and use high voltages. Mostly boosted from a low voltage source, so caution should be taken when operating. Injury should be limited only to those with delicate heart conditions.

I never take pre-orders. This practice has the potential for fraud. A few years ago, another kit supplier took payments on kits, to purchase inventory for the kits. It ended up as a “rob peter, to pay paul” scheme. Hence, I will never use this policy.

Threeneurons Kits – TO-92 Transistor Substitution Guide


Diode & Rectifier Orientation:

For hobby novices, or old timer who’s eyeball ain’t what they use to be (like me), here is a guide for properly orienting a diode, or rectifier, that come in the common DO-35 (small glass), or DO-41 (epoxy cylinder) packages:


A diode (or rectifier) has two leads (terminals): (1) an Anode, and a (2) Cathode. You can almost always see that the cathode side has a stripe painted on the body, near that lead. Sometime the printing equipment was not lined up properly, and the “stripe” is too close to the center. In this case, look for any text. Usually a part number. That text will be on the anode side, since that’s where most of the space is suppose to be, if it was aligned properly.