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Back to Measurement Equipments 1

Frequency Counter LS-223 ( Home brew )

[Outline] [Front view] [Top view] [Bottom view] [Block diagram]

[5 stage counters] [1st stage counter for 50MHz signal input]

Fig.1 Top view of the inside

2 pwbs are layouted on the top side of the case. Upper left side pwb is 6-stage clock divider pwb.

Middle large pwb is gate, counter, latch and timebase generator.

Nixie tubes and driver ICs are mounted on a pwb fixed to the front panel.

A transformer and a power transistor with heatsink are mounted on the rear panel.