The Original EX-System Kits
The names of the original kits, EX-15, EX-30, etc., give the number of experiments that could be performed with them. By purchasing expansion kits, EX-A, EX-B, etc., any of the kits could be upgraded to support the complete set of 191 experiments. 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.
Note that the EX-FM kit is compatible with all of the main kits, although some of its experiments require blocks from later kits in the series.
| Name | As upgrade | Significant components | Example experiment |
|---|---|---|---|
| EX-15 | antenna, crystal earpiece | Diode Detector Radio | |
| EX-30 | EX-15 + EX-A | morse key block, short cables | Morse Code Practice Circuit |
| EX-60 | EX-30 + EX-B | IC Amplifier | I-Diode Detector + IC Radio (Fixed Bias) |
| EX-100 | EX-60 + EX-C | tester probes | Wireless Water Level Warning Device |
| EX-120 | EX 100 + EX-D | microphone, CdS cell | Circuit which Buzzes when Struck by Light |
| EX-150 | EX-120 + EX-E | analogue meter | Noise Level Meter |
| EX-181 | EX-150 + EX-System Synthesiser | synthesiser block, resistance board | Sound of Car being Reversed |
| EX-FM | any main kit + EX-FM | FM tuner block | FM Receiver with Microphone Mixer |
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