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Equipments 1
Frequency Counter LS-223 ( Home brew )
[Outline] [Front view] [Top view] [Bottom view] [Block diagram]
[Pre-amplifire,
pre-scaler and 10MHz clock
osccilator]
[5V
AVR pwb and capacitors for power supply]
[BCD
to decimal converter (nixie tube driver)]
Fig.1 Bottom view of the inside
Fig.5 shows the bottom side of the case. 3 pwbs, a transformer and condensers for power supply are layouted.
Upper side pwb are consist of pre-amplifire, pre-scaler and 10MHz clock oscillator.
Middle small pwb is 5V AVR which drives a power transistor mounted on the rear panel.
Left side pwb is for nixie tubes and the driver ICs.