Sure have and a gain of 2 typically. Though if its 10 Mhz, not sure how well that will work. I was doing 5 Mhz at the time and also using buffer amps I think they were LH0036 or 18s. Essentially a gain of 2 stage feeding numbers of buffers. Downside of the approach is that the linear buffer amps suck power. Since I prefer lower power I evolved over the years. Regards Paul.
On Sat, Jan 7, 2012 at 11:39 AM, Peter Gottlieb <[email protected]> wrote: > Ah, thanks, that was enough to get me thinking, to pull me away from my > job's problems and back to the fun side. > > I just replaced my wife's computer, and old obsolete big Dell box, with a > sleek new (and much faster) laptop. I was about to throw out the old box > but now have a use for the large CPU heatsink/fan assembly. I will mount > the FE-5680A to an aluminum plate and then to the heatsink. I don't need > the plate thermally, but it makes the mechanical mounting much easier. > I'll use some thermally conductive pads between things. I will use > something like the circuit you provided (thank you), I have a bunch of > those TO-92 temperature sensors with wires attached, more surplus from > work, and then will mount the whole thing with power supply into a box > where I can set up the air flow like I want. > > So, here's a question. One app is a rack of gear which all needs to get > the 10 MHz. I could just go find some distribution amp, but I would prefer > to build something. Has anyone done this? I was thinking perhaps a good > solid reasonably high power op amp buffer feeding resistors to each output > to each piece of gear? Anyone done this and found any "gotchas" or success > stories? > > Peter > > > > > On 1/6/2012 1:51 PM, [email protected] wrote: > >> I just grabbed something I had around it is a 24 V 0.1 A. I run at 15 V, >> dimensions are 80X80X24 mm I just bought some 80X80X10 mm and I am sure >> they will work as well. There are so many choices I recently bought a >> new one >> with integrated heat sink and tried it on a FRS all for $ 6 shipping >> included. >> Attached are two circuits I use, the top one since I did not have a PC >> board. I now have a board and I used in an other application the two >> stage one >> and if you use a heat sink I recommend replacing the feedback resistor on >> stage two with a capacitor. >> Bert Kehren >> >> >> In a message dated 1/6/2012 1:16:01 P.M. Eastern Standard Time, >> [email protected] writes: >> >> What kind of temperature controlled fan did you use? >> >> >> On 01/06/12, [email protected] wrote: >> >> I do not understand why this is even discussed. Running at lower >> temperature will extend life and using a fan with temperature control >> will >> cost no >> more than $ 12 and I challenge any of you how I can get for so little >> money >> more than one order of magnitude improvement. As I reported before I >> started >> out with heat sink only and quickly realized that I would not be able to >> measure aging because the last 2 digits where all over the place and >> unless >> you have an environment where your lab is within 0.1C you are throwing >> away the real advantage of a Rb. >> I did enclose the Rb cell and the OCXO on a FEI 5962B, its modularity >> lends >> it self for such testing, it was not worth the effort and the power >> saving >> was minimal. >> Once my aging tests are completed I will test for 15 V voltage >> sensitivity. >> Bert Kehren >> >> >> In a message dated 1/6/2012 11:35:02 A.M. Eastern Standard Time, >> [email protected] writes: >> >> A heat sink may not be required, per se, although I would expect that a >> larger thermal mass and/or thermal regulation via a closed loop fan >> controller will help smooth out/stabilize temperature effects. >> >> >> On 01/06/12, Chuck Forsberg WA7KGX N2469R<[email protected]> wrote: >> >> The Tech Manual does not call for heat sinking (unless I missed >> something). >> The top has labels over much of the surface. >> The bottom has a plastic sheet between the circuitry and bottom plate. >> It appears the unit was expected to be rather hot when running. >> I have mine mounted on the out side of the box using standoffs. >> On 01/06/2012 07:39 AM, Bob Smither wrote: >> >>> -----BEGIN PGP SIGNED MESSAGE----- >>> Hash: SHA1 >>> >>> Chris Albertson wrote: >>> >>>> On Thu, Jan 5, 2012 at 6:11 PM,<[1][email protected]**> wrote: >>>> >>>> >>>> l<[2]http://www.freqelec.com/**rb_osc_fe5680a.html<http://www.freqelec.com/rb_osc_fe5680a.html>> >>>>> says 32W peak, >>>>> >>>> but then >> >>> also 15-18v@700mA, which doesn't make sense. >>>>> >>>> It will pull 35W for the first five or so minutes then the current >>>> >>> drops >> >>> rather suddenly to about 700mA. >>>> >>>> I have an analog amp meter on my power supply and I can see a switch >>>> >>> over >> >>> after the unit heats up. They must run an internal oven heater full >>>> >>> tilt >> >>> at first then go into regulated mode. >>>> >>>> Some one else said you can cause the FE5680 to draw more power in >>>> >>> steady >> >>> state mode by adding heat sinking it. Yes that works. Seems the >>>> >>> FE5680 >> >>> wants to be at some set temperature and the heat sink means it takes >>>> >>> more >> >>> power to keep at the set point. I just let the fe5680 rest on a >>>> >>> small >> >>> aluminum plate. >>>> >>> Have you measured the case temperature of your FE5680? >>> >>> I put mine on a heat sink and the case temperature stays around 50C. >>> >> Without >> >>> the heat sink it was around 60C. Does anyone know what temperature is >>> recommended? The 50C seems a little hot, but the unit appears to work >>> >> well. >> >>> - -- >>> Bob Smither, PhD Circuit Concepts, Inc. >>> >>> ==============================**==============================** >> =========== >> == >> >>> Government is not healthy for children and other living things. >>> -- Jeff Daiell >>> >>> ==============================**==============================** >> =========== >> == >> >>> [3][email protected] [4]http://www.C-C-I.Com 281-331-2744(office) >>> >> -4616(fax) >> >>> -----BEGIN PGP SIGNATURE----- >>> Version: GnuPG v1.4.5 (GNU/Linux) >>> Comment: Using GnuPG with CentOS - [5]http://enigmail.mozdev.org >>> >>> iD8DBQFPBxXFsmY7BY+**CYksRAlutAJ9R9STR0oja4ib1CjKXL**EfGe3uXpgCfRW8D >>> m78FO0Trn+6bIBPKrNs8PVQ= >>> =FdtA >>> -----END PGP SIGNATURE----- >>> >>> >>> ______________________________**_________________ >>> time-nuts mailing list -- [6][email protected] >>> To unsubscribe, go to >>> >> [7]https://www.febo.com/cgi-**bin/mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> >> >>> and follow the instructions there. >>> >> -- >> Chuck Forsberg WA7KGX N2469R [8][email protected] [9]www.omen.com >> Developer of Industrial ZMODEM(Tm) for Embedded Applications >> Omen Technology Inc "The High Reliability Software" >> 10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430 >> ______________________________**_________________ >> time-nuts mailing list -- [10][email protected] >> To unsubscribe, go to >> [11]https://www.febo.com/cgi-**bin/mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> >> and follow the instructions there. >> >> References >> >> 1. mailto:[email protected] >> 2. >> http://www.freqelec.com/rb_**osc_fe5680a.html<http://www.freqelec.com/rb_osc_fe5680a.html> >> 3. mailto:[email protected] >> 4. http://www.C-C-I.Com/ >> 5. http://enigmail.mozdev.org/ >> 6. mailto:[email protected] >> 7. >> https://www.febo.com/cgi-bin/**mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> >> 8. mailto:[email protected] >> 9. http://www.omen.com/ >> 10. mailto:[email protected] >> 11. >> https://www.febo.com/cgi-bin/**mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> >> ______________________________**_________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/**mailman/listinfo/time-nuts<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<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<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<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<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.
