How do you design these days?
in [Design]
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From: krw on 6 Jan 2010 18:28 On Wed, 06 Jan 2010 10:35:36 -0800, RST Engineering <jweir43(a)gmail.com> wrote: >On Tue, 05 Jan 2010 10:52:53 -0800, Joerg <invalid(a)invalid.invalid> >wrote: > > >>I've worked with one that did switch-mode supply designs, something most >>engineers seem not to enjoy at all. Note to readers: Too late, she's now >>married. > > >That didn't seem to slow Tiger down. > >{;-) It took a while to catch on, but she eventually did. A nine-iron will do that.
From: Michael A. Terrell on 6 Jan 2010 19:29 Joerg wrote: > > Still listnin' :-) So? I was busy for several days. treating a cut on my leg, driving to Gainsville to get three prescriptions the VA didn't refill in time, and working to remove & replace the base cabinet on my kitchen sink. Staying alive is more important than replying to you. I was off the group from some time Sunday. -- Greed is the root of all eBay.
From: Joerg on 6 Jan 2010 19:44 Michael A. Terrell wrote: > Joerg wrote: >> Still listnin' :-) > > > So? I was busy for several days. treating a cut on my leg, driving > to Gainsville to get three prescriptions the VA didn't refill in time, > and working to remove & replace the base cabinet on my kitchen sink. > Staying alive is more important than replying to you. I was off the > group from some time Sunday. > What? A kitchen cabinet is more important than I? Hurumph ... Hope your cut is healing and stops hurting. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: JosephKK on 7 Jan 2010 00:08 On Wed, 06 Jan 2010 10:16:33 -0800, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >On Tue, 05 Jan 2010 22:15:13 -0800, >"JosephKK"<quiettechblue(a)yahoo.com> wrote: > >>On Wed, 30 Dec 2009 22:15:46 -0800, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >> >>>On Wed, 30 Dec 2009 20:02:02 -0800, D from BC >>><myrealaddress(a)comic.com> wrote: >>> >>>>On Wed, 30 Dec 2009 20:01:39 -0600, "RogerN" <regor(a)midwest.net> >>>>wrote: >>>> >>>>> >>>>>When I was in school components fit on solderless breadboards and we made >>>>>circuits using breadboards, power supplies, meters and oscilloscopes. Many >>>>>of today's components don't appear to be breadboard friendly, so how is it >>>>>done today? >>>>> >>>>>Is circuit design software and simulation good enough to go straight to a PC >>>>>board? Or do you use surface mount to breadboard adapters? Do you still >>>>>use a soldering Iron to solder or paste solder and an oven? >>>>> >>>>>I'm wanting to tinker with some circuits but some chips I'm interested in >>>>>only comes in MSOP or other packages that look intimidating to attempt to >>>>>solder. >>>>> >>>>>Thanks! >>>>> >>>>>RogerN >>>>> >>>> >>>>My motto: >>>>If it works on a breadboard, it's not worth producing. >>>> >>>>On my current project, I have to feed the simulator pcb parasitics and >>>>component parasistics to get accurate simulations. >>>>I've had to bench test to get some parasitics. Once parasitics are >>>>included, scope results and simulation results get close. >>>> >>>>If all looks good on sim, I make a pcb, etch it and bench test it. >>> >>>One problem is that device models often aren't available for fast >>>parts, or all you get are S-params when you need large-signal >>>time-domain stuff. So sometimes you can learn a lot by hacking some >>>FR4 and testing parts. >>> >>>I never breadboard entire products, or even complex circuits... just >>>enough to characterize parts or simple subcircuits. >>> >>>This is an EL07 driving a PHEMT... >>> >>>ftp://jjlarkin.lmi.net/BB_fast.JPG >>> >>>which made decent 5-volt, 1 GHz square waves. >>> >>>John >> >>Is that 0.085 or 0.141 semirigid. > >85. I have buckets of roughly 8" long chunks of hardline with an SMA >on one end, off ebay. > >John I thought so. But i haven't had my hands on any for 20 years now.
From: John Larkin on 7 Jan 2010 00:23
On Wed, 06 Jan 2010 21:08:37 -0800, "JosephKK"<quiettechblue(a)yahoo.com> wrote: >On Wed, 06 Jan 2010 10:16:33 -0800, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: > >>On Tue, 05 Jan 2010 22:15:13 -0800, >>"JosephKK"<quiettechblue(a)yahoo.com> wrote: >> >>>On Wed, 30 Dec 2009 22:15:46 -0800, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >>> >>>>On Wed, 30 Dec 2009 20:02:02 -0800, D from BC >>>><myrealaddress(a)comic.com> wrote: >>>> >>>>>On Wed, 30 Dec 2009 20:01:39 -0600, "RogerN" <regor(a)midwest.net> >>>>>wrote: >>>>> >>>>>> >>>>>>When I was in school components fit on solderless breadboards and we made >>>>>>circuits using breadboards, power supplies, meters and oscilloscopes. Many >>>>>>of today's components don't appear to be breadboard friendly, so how is it >>>>>>done today? >>>>>> >>>>>>Is circuit design software and simulation good enough to go straight to a PC >>>>>>board? Or do you use surface mount to breadboard adapters? Do you still >>>>>>use a soldering Iron to solder or paste solder and an oven? >>>>>> >>>>>>I'm wanting to tinker with some circuits but some chips I'm interested in >>>>>>only comes in MSOP or other packages that look intimidating to attempt to >>>>>>solder. >>>>>> >>>>>>Thanks! >>>>>> >>>>>>RogerN >>>>>> >>>>> >>>>>My motto: >>>>>If it works on a breadboard, it's not worth producing. >>>>> >>>>>On my current project, I have to feed the simulator pcb parasitics and >>>>>component parasistics to get accurate simulations. >>>>>I've had to bench test to get some parasitics. Once parasitics are >>>>>included, scope results and simulation results get close. >>>>> >>>>>If all looks good on sim, I make a pcb, etch it and bench test it. >>>> >>>>One problem is that device models often aren't available for fast >>>>parts, or all you get are S-params when you need large-signal >>>>time-domain stuff. So sometimes you can learn a lot by hacking some >>>>FR4 and testing parts. >>>> >>>>I never breadboard entire products, or even complex circuits... just >>>>enough to characterize parts or simple subcircuits. >>>> >>>>This is an EL07 driving a PHEMT... >>>> >>>>ftp://jjlarkin.lmi.net/BB_fast.JPG >>>> >>>>which made decent 5-volt, 1 GHz square waves. >>>> >>>>John >>> >>>Is that 0.085 or 0.141 semirigid. >> >>85. I have buckets of roughly 8" long chunks of hardline with an SMA >>on one end, off ebay. >> >>John > >I thought so. But i haven't had my hands on any for 20 years now. I think lots of people have hardlines fabbed and then something goes wrong, project canceled, wrong length, whatever, and they wind up on ebay. There are lots of SMBs, too, from Cisco systems or something. I just bought 30 SMA "connector savers" (short male-female things) for about $1.50 each, ebay again. They are at least $10 each from regular sources. John |