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Frequency Counter LS-223 ( Home made )

[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 Pre-scaler ECL HD10551 ( Hitachi )

Fig.1 shows Pre-scaler IC. This is ECL ( Emitter Coupled Logic ) and has an ability to count up to 250MHz. Pre-amplifire and level converter from ECL to TTL are also contained in this IC.