[time-nuts] Frequency Divider

David C. Partridge david.partridge at dsl.pipex.com
Fri Apr 3 11:58:35 UTC 2009


That's what the board I did last year does, 10 MHz sine in, and 5V p-p
square wave out at 10MHz, 5MHz, 1MHz and one additional output with
frequency selectable by decade from 100kHz down to 1Hz.

Dave

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Brian Kirby
Sent: 02 April 2009 03:17
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Frequency Divider

Maybe we all could come up with a separate new board to take 10 Mhz and give
us 5 Mhz and 1 Mhz out.

Start with a buffer amp and then a decent Schmidt trigger.  Feed it to a
symmetrical divide by 2 for 5 Mhz, and a symmetrical dive by 10 for 1 Mhz.
These out puts could be buffered with 74AC04 for TTL.  Another set of
outputs could be derived and filtered to give sine wave outputs.

It seems the crowd is against 7490s, and 74390s - and I would like to know
what the crowd recommends as suitable.

Brian KD4FM

John Ackermann N8UR wrote:
> Hi Bruce --
>
> Good point; I'll leave it to the software guys to figure that out. :-)
>
> John
> ----
>
> Br
>

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