Gakken EX-System

Over 25 years after its original release, one of the main kits from the series was reissued in Japan in 2002.

When fully expanded, the main unit contains: Some circuits require apparatus which are unsuitable for putting inside blocks, for example, a crystal earpiece.

The instruction booklet gives the correct arrangement of blocks to make each circuit, a full schematic for it and a brief explanation of how the experiment works.

Each expansion kit added new denshi blocks and came with a piece of external apparatus or some circuitry to be installed in the main unit.

As some of the experiments involve two separate circuits, a plastic tray with room for 6 x 5 standard blocks is also provided.

Since the chip requires a separate 9V power supply, the synthesiser block had a compartment for holding a 9V battery.

[1] The Denshi Block system was also sold under the Humbrol, Skilcraft[2] and Tron Link[3] brands.