[sdiy] My awesome DIY Christmas gift

[nicolas]

One thing that interested/disappointed me about this discrete design is that it is done with lots of 2 transistor divide-by-2 flip-flops with diode and/ors to extract the decimal from the binary.  I was hoping to see ring-of-5 type circuits or similar, to save a transistor or two like they probably would have done in 1970.

Cheers,
Nicolas


--- On Sun, 21/12/08, Magnus Danielson <magnus at rubidium.dyndns.org> wrote:

From: Magnus Danielson <magnus at rubidium.dyndns.org>
Subject: Re: [sdiy] My awesome DIY Christmas gift
To: "Paul Schreiber" <synth1 at airmail.net>
Cc: "Andre Majorel" <aym-htnys at teaser.fr>, synth-diy at dropmix.xs4all.nl
Received: Sunday, 21 December, 2008, 10:17 AM

Paul Schreiber skrev:
> Counts AC line frequency.

Not much worse than many other clocks. I have a frequency counter that does the same, but mine has the crystal option which is a 100 kc/s oscillator (kept it in original language). That counter is in the pre-Nixie generation. :)

I really like the phantastron circuit. As I recall it, the division between net frequency to 10 Hz and 1 Hz only takes up 3 tubes. To support 50 Hz and 60 Hz they provided a trimmer at the back of the counter. When using the 100 kc/s oscillator, this is tuned to properly divide 100 Hz instead. The 100 kc/s oscillator option includes a oscillator core and a division by 1000 using three phantastron circuits in series.

Phantastron circuits should be possible to achieve in transistors designs.

Cheers,
Magnus
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