Hi Guys
I've almost completed my Retro Atomic Clock / Frequency Counter based on one of the
Rubidium Frequency Standards which are becoming affordable from eBay.
This has been a three month long project aimed at using digital logic even if a little
extra programming for the micro could make it redundant.
I wanted to simulate the way the old HP frequency counters count live in your face
Speech is done with Roman Black's 1 bit algorithm. The main chip queues samples to play
spoken numbers naturally (ie "eleven, thirteen, thirty-five", etc.) up to 100, which covers the spoken time.
Larger numbers are spoken like "two-twenty-seven", or "seven-twenty".
I have yet to implement a reset signal, but know how to do it.
The least significant digit is a high speed decade counter (up to 50 MHz),
and the frequency counter is only designed for HF work with absolute count (without any pre scaling).
YouTube Video:
The following video is a test when I assembled the high frequency RF preamp.
This is the counter boards counting a 10MHz test signal.
Cheers, Art.
I've almost completed my Retro Atomic Clock / Frequency Counter based on one of the
Rubidium Frequency Standards which are becoming affordable from eBay.
This has been a three month long project aimed at using digital logic even if a little
extra programming for the micro could make it redundant.
I wanted to simulate the way the old HP frequency counters count live in your face
Speech is done with Roman Black's 1 bit algorithm. The main chip queues samples to play
spoken numbers naturally (ie "eleven, thirteen, thirty-five", etc.) up to 100, which covers the spoken time.
Larger numbers are spoken like "two-twenty-seven", or "seven-twenty".
I have yet to implement a reset signal, but know how to do it.
The least significant digit is a high speed decade counter (up to 50 MHz),
and the frequency counter is only designed for HF work with absolute count (without any pre scaling).
YouTube Video:
The following video is a test when I assembled the high frequency RF preamp.
This is the counter boards counting a 10MHz test signal.
Cheers, Art.
Last edited: