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Old 26th Mar 2018, 5:48 pm   #14
TonyDuell
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Join Date: Jun 2015
Location: Biggin Hill, London, UK.
Posts: 5,190
Default Re: HP 5245L counter crystal oscillator

I seem to remember that the digit counter PCBs (the ones with the nixie tubes on the front, other than the right hand digit which is different due to the higher speed needed) are an ingenious HP design. It's a BCD counter, latch and display driver in 8 transistors (and no silicon ICs).
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