[time-nuts] PDIP package 100 MHz decade dividers

[Bob kb8tq]

Hi

One very simple “fix” for the low voltage sine wave:

Put in an L network and transform the load output to a higher
impedance. Voltage goes up as square root of impedance change.
For modest (2X ~ 4X) voltage changes, the lowpass L network still
has modest Q and low component sensitivities.

Bob

> On Jul 18, 2020, at 8:31 AM, Didier Juges <shalimr9 at gmail.com> wrote:
> 
> A long time ago I used a 74AC74 to prescale a 100MHz VCO down to 25, the
> 74AC74 was AC coupled to the VCO and the signal was a fraction of a volt.
> Worked quite well.
> Probably not time-nuts quality but in a pinch it did the job at the time.
> Didier
> 
> On Sat, Jul 11, 2020 at 9:37 PM Alex Pummer <alex at pcscons.com> wrote:
> 
>> Hi Perrier
>> https://www.y-ic.es/datasheet/3b/74F569SC.pdf   will work
>> 73
>> KJ6UHN
>> Alex
>> 
>> On 7/11/2020 3:00 PM, Perry Sandeen via time-nuts wrote:
>>> Learned List,
>>> On previous posts I was looking for a PDIP package 100 MHz decade
>> divider. Reading just the front of the data sheet I thought that the
>> 74LS161 would work. Boy, was I wrong.  Several members posted that 25 Mhz
>> max was its limit.
>>> So *on the road again* (sorry Willie) I went on another search this time
>> with the correct logic family.
>>> It turns out Arrow carries the 74HC161 for less that $1.
>>> Additionally I D/L'd the Charles Wenzel Unusual Frequency Dividers PDF
>> and discovered a 100 MHz decade divider circuit using 1/2 of a 74HC74 in a
>> configuration that will decade divide up to 300 MHz.
>>> I'm attaching a copy of the circuit for anyone interested.
>>> Regards,
>>> Perrier
>>> 
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