CD4060 Xtl Osc. Circuit
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From: Phil Hobbs on 12 Mar 2010 20:55 On 3/12/2010 7:45 PM, Joerg wrote: > Steve Upton wrote: >> I have copied the CD4060 part of the CMOS synthesizer in the link >> below to the letter, but it does not work. I am using a 12VDC SLA for >> supply. It tries to start when I tease the caps, but then dies. >> >> I've spent hours tinkering to no avail. Can anyone see what is might >> be going amiss? ... > > > Not knowing which frequency you are using, the 100k is way too low. I > never go below 1M. Also, the burden caps are highish, 100pF is a bit much. > > >> ... Or can anyone please provide a similar circuit that works? >> > > Yup: > > http://www.edn.com/contents/images/6553623.pdf > > >> http://www.redclifferadioclub.org.au/QRM/2006%2010%20-%20October%20QRM.pdf >> >> > > How on earth could you guys call your club bulletin "QRM"? ... :-) > > (for non-hams: QRM means noise, of the undesired kind, meaning not from > a rock band and stuff) > Nah, noise is QR*N*. QRM is interference, usually other random lusers gassing about their equipment. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal ElectroOptical Innovations 55 Orchard Rd Briarcliff Manor NY 10510 845-480-2058 hobbs at electrooptical dot net http://electrooptical.net
From: John Larkin on 13 Mar 2010 12:05 On Sat, 13 Mar 2010 08:42:27 -0800, Fred Abse <excretatauris(a)invalid.invalid> wrote: >On Fri, 12 Mar 2010 16:28:07 -0800, John Larkin wrote: > >> I never buy crystals for things like this. They have a high probability of >> not working, and you wind up fiddling with capacitors and such. It's >> easier to but a packaged, working crystal oscillator, already tuned to a >> couple PPM, guaranteed to oscillate, for $1.50 or thereabouts. > >Me, too. Amplifiers oscillate, oscillators don't ;-) We've just started using silicon oscillators, in SOT-23 sized packages, for things where 1% is good enough. We're using one part that's pin strappable for 8-4-2-1 MHz. John
From: Ian Stirling on 13 Mar 2010 12:53 Steve Upton <steveupton(a)gerber.com> wrote: > I have copied the CD4060 part of the CMOS synthesizer in the link > below to the letter, but it does not work. I am using a 12VDC SLA for > supply. It tries to start when I tease the caps, but then dies. > > I've spent hours tinkering to no avail. Can anyone see what is might > be going amiss? Or can anyone please provide a similar circuit that > works? How are you constructing this? Breadboard? If so - the 10pf beween every strip can really screw htings up.
From: Jim Thompson on 13 Mar 2010 13:01 On Sat, 13 Mar 2010 00:20:46 GMT, steveupton(a)gerber.com (Steve Upton) wrote: >I have copied the CD4060 part of the CMOS synthesizer in the link >below to the letter, but it does not work. I am using a 12VDC SLA for >supply. It tries to start when I tease the caps, but then dies. > >I've spent hours tinkering to no avail. Can anyone see what is might >be going amiss? Or can anyone please provide a similar circuit that >works? > >http://www.redclifferadioclub.org.au/QRM/2006%2010%20-%20October%20QRM.pdf > >Steve Upton What crystal are you using? The pi network components are frequency/crystal dependent... "...tries to start when I tease the caps" suggests that's your problem. ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | The only thing bipartisan in this country is hypocrisy
From: krw on 13 Mar 2010 13:37
On Sat, 13 Mar 2010 09:05:24 -0800, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >On Sat, 13 Mar 2010 08:42:27 -0800, Fred Abse ><excretatauris(a)invalid.invalid> wrote: > >>On Fri, 12 Mar 2010 16:28:07 -0800, John Larkin wrote: >> >>> I never buy crystals for things like this. They have a high probability of >>> not working, and you wind up fiddling with capacitors and such. It's >>> easier to but a packaged, working crystal oscillator, already tuned to a >>> couple PPM, guaranteed to oscillate, for $1.50 or thereabouts. >> >>Me, too. Amplifiers oscillate, oscillators don't ;-) > >We've just started using silicon oscillators, in SOT-23 sized >packages, for things where 1% is good enough. We're using one part >that's pin strappable for 8-4-2-1 MHz. A seven pin SOT-23? |