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This is a guide on how to build a simple enclosure for your bat-detector or for your bat-beacon. The enclosure is based on 50mm PVC-tubing and PVC-caps.You can also download the document


R10RectificatieDuring the assembly of the construction kits in China there was a mistake with resistor R10. In place of the prescribed 470 Ω, there is attached a resistance of 470 KΩ.
This works only the LEDs but very little light.
For use at dusk or at night in the forest, this is sufficient and can even be an advantage. , If desired, the still brighter LED to light its resistance of 470 Ω (yellow, purple, brown, gold) supplied separately.

470ohm = yellow, purple, brown, gold

470kOhm = yellow, purple, yellow, gold


Digi-Dice 2014

This year, the Service Kring JOTA-JOTI again managed to establish a fun and educational construction project what we called Digi-Dice. As in previous years, this kit is intended for use by children soldered together (under supervision) and to become familiar with electronics. Besides this is a nice kit it is also useful because it can be used in Scouting games on various ways

Digidice2014 Kl1


Usage and options:


Once the batteries are installed, the Dig-Dice and performs a self-test.

All segments go on one by one and then burn all segments simultaneously. The Digi-Dice is now ready for use as dice. Press the button to start the dice, a running light appears and a number is displayed. Press the button to throw again.

However, the Digi-Dice has even more possibilities. By holding the button down longer, you can switch to another mode, this is indicated in the display.

There is the d. of dice, as we have seen above, we can note the dice here and there will be a number from 1/6 to appear on the display. One press of the button is throwing again.

   Then there is the r. of random (random) in this position, the Dig-Dice will provide a random number from 0 / to 9.

  Then there is the G. guide (guide), in this mode you can use the Digi-Dice for a direction to determine this, go back completely random There are three possibilities, turn left, turn right and go straight.

Finally we have the F. flash (flash), this is a kind of running light, the display will continuously run in circles.

Except that the Digi-Dice a fun and decorative structure there are also countless fun games to play with. Using a number of printing a fun scavenger hunt in the neighborhood or in the forest and use it as a die in games.

Do you have other ideas please tell us!

Do you have comments or want to provide feedback on the Digi-Dice?

Do you have comments or questions about the Service Circuit JOTA-JOTI?



pointer3bDo you just hate when you can not find your tent in the dark. Or that the one leading Post-it just is not enough standing out among all other memo leaves? Then you really need the "Pointer"! The Pointer is a a running light that turns itself On in the light or in the dark.

The speed of the running light, in the form of an arrow, is variable. By pointing the Arrow anyone can draw the attention to something important. But you can also take off for a trip in the dark: Hang the pointer on an inconspicuous area. If a flashlight is shone, the Pointer work and you know which way to go (just follow the arrows !).

Of course you can also use the indoor Pointer: Hang it next to your own bedroom door and at night you can always find your own room back! Have you become very enthusiastic of soldering: Three pointers form a perfect circle!

The kit is powered by a 9V battery and will cost around 4.50 Euro go

You can order your Pointers NOW



Lasergame MKII

The laser game MKII is a remake  of last years  Lasergame MKII 2011. The game has the following Features:

- Adjustable team indicator, Team Red, Team Green, Team Red / Green or no indication

- Sensitive to visible light (flashlight)

- Sensitive to infrared (remote control)

- Reset with a magnet, uses a Hall sensor is not a fragile reed-relay!

- Settings only change with simultaneous activation of the select button and magnet

- Fraud proof: the loosening of the coupling, the battery in alarm Lasergame

- Supply with a 9V battery