Except it's not a Schmidt trigger at the input, it's a MAX999 or ADCMP600 - see Bruce's page on Didier's web site for the basic design of this part of the circuit.
D. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of David C. Partridge Sent: 03 April 2009 12:59 To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] Frequency Divider 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: [email protected] [mailto:[email protected]] 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 > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
