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 <[email protected]> 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 <[email protected]> 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 >>> >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >>> and follow the instructions there. >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >> and follow the instructions there. >> > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
