Forums

too cold

Started by John Larkin October 18, 2018
I put some epoxy on an EPC bga GaN fet to glob-top protect it. And
looked for a warm place to put the board to speed up the cure. LED
lights, switching power supplies, LCD scopes... there nothing warm any
more.


-- 

John Larkin         Highland Technology, Inc
picosecond timing   precision measurement 

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

On Thu, 18 Oct 2018 11:15:58 -0700, John Larkin
<jjlarkin@highland_snip_technology.com> wrote:

>I put some epoxy on an EPC bga GaN fet to glob-top protect it. And >looked for a warm place to put the board to speed up the cure. LED >lights, switching power supplies, LCD scopes... there nothing warm any >more.
There is a little warm air coming out of the back of my 500 MHz Rigol scope. I put the board there. -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
On Thursday, October 18, 2018 at 12:19:12 PM UTC-6, John Larkin wrote:
> On Thu, 18 Oct 2018 11:15:58 -0700, John Larkin > <jjlarkin@highland_snip_technology.com> wrote: > > >I put some epoxy on an EPC bga GaN fet to glob-top protect it. And > >looked for a warm place to put the board to speed up the cure. LED > >lights, switching power supplies, LCD scopes... there nothing warm any > >more. > > There is a little warm air coming out of the back of my 500 MHz Rigol > scope. I put the board there. > > > -- > > John Larkin Highland Technology, Inc > picosecond timing precision measurement > > jlarkin att highlandtechnology dott com > http://www.highlandtechnology.com
This is a problem! I still keep a gooseneck lamp at my workbench with an incandescent bulb. Might be hard to find a replacement once my stock of bulbs burn out. The fan exhaust on the laptop I keep at that bench has served me many times for curing epoxy.
On Thursday, October 18, 2018 at 2:16:06 PM UTC-4, John Larkin wrote:
> I put some epoxy on an EPC bga GaN fet to glob-top protect it. And > looked for a warm place to put the board to speed up the cure. LED > lights, switching power supplies, LCD scopes... there nothing warm any > more.
You need a high end laptop. My Dell Precision 6800 blows like a hair dryer. Well, maybe not that much air, but it can be pretty warm. Run a spice simulation and lay it behind the PC... it will get warm. I've kept my tea warm that way. Rick C.
On Thursday, October 18, 2018 at 2:16:06 PM UTC-4, John Larkin wrote:
> I put some epoxy on an EPC bga GaN fet to glob-top protect it. And > looked for a warm place to put the board to speed up the cure. LED > lights, switching power supplies, LCD scopes... there nothing warm any > more. > > > -- > > John Larkin Highland Technology, Inc > picosecond timing precision measurement > > jlarkin att highlandtechnology dott com > http://www.highlandtechnology.com
Power supply and a power resistor, stick it on copper clad, cover if you wish. Adjust current to taste. George H.
On Thu, 18 Oct 2018 12:08:15 -0700 (PDT), DemonicTubes
<tlackie@gmail.com> wrote:

>On Thursday, October 18, 2018 at 12:19:12 PM UTC-6, John Larkin wrote: >> On Thu, 18 Oct 2018 11:15:58 -0700, John Larkin >> <jjlarkin@highland_snip_technology.com> wrote: >> >> >I put some epoxy on an EPC bga GaN fet to glob-top protect it. And >> >looked for a warm place to put the board to speed up the cure. LED >> >lights, switching power supplies, LCD scopes... there nothing warm any >> >more. >> >> There is a little warm air coming out of the back of my 500 MHz Rigol >> scope. I put the board there. >> >> >> -- >> >> John Larkin Highland Technology, Inc >> picosecond timing precision measurement >> >> jlarkin att highlandtechnology dott com >> http://www.highlandtechnology.com > >This is a problem! I still keep a gooseneck lamp at my workbench with an incandescent bulb. Might be hard to find a replacement once my stock of bulbs burn out. > >The fan exhaust on the laptop I keep at that bench has served me many times for curing epoxy.
I'll write a compute-bound app, with lots of floating point, to keep my laptop exhaust warm. Actually, LT Spice would work. It can use all the cores, too. -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
John Larkin <jjlarkin@highland_snip_technology.com> writes:
> I put some epoxy on an EPC bga GaN fet to glob-top protect it. And > looked for a warm place to put the board to speed up the cure. LED > lights, switching power supplies, LCD scopes... there nothing warm any > more.
Too bad you can't harness the power of all the hotheads on usenet... ;-)
On 19/10/2018 07:10, George Herold wrote:
> On Thursday, October 18, 2018 at 2:16:06 PM UTC-4, John Larkin wrote: >> I put some epoxy on an EPC bga GaN fet to glob-top protect it. And >> looked for a warm place to put the board to speed up the cure. LED >> lights, switching power supplies, LCD scopes... there nothing warm any >> more. >> >> >> -- >> >> John Larkin Highland Technology, Inc >> picosecond timing precision measurement >> >> jlarkin att highlandtechnology dott com >> http://www.highlandtechnology.com > > Power supply and a power resistor, stick it on copper clad, > cover if you wish. Adjust current to taste. > > George H. >
I have been meaning to make a little oven like that (but with a PID controller), in a thermos (vacuum flask), for drying a few chips before reflow, or curing epoxy, etc. There were some nice small vacuum flasks at ikea with a very wide mouth. They don't insulate quite as well as others due to the wide mouth but it is good for a tiny oven. If the power consumption is low then I could leave it on, so that I don't have to wait for warm-up time when curing epoxy.
On Thursday, October 18, 2018 at 6:57:04 PM UTC-4, Chris Jones wrote:
> On 19/10/2018 07:10, George Herold wrote: > > On Thursday, October 18, 2018 at 2:16:06 PM UTC-4, John Larkin wrote: > >> I put some epoxy on an EPC bga GaN fet to glob-top protect it. And > >> looked for a warm place to put the board to speed up the cure. LED > >> lights, switching power supplies, LCD scopes... there nothing warm any > >> more. > >> > >> > >> -- > >> > >> John Larkin Highland Technology, Inc > >> picosecond timing precision measurement > >> > >> jlarkin att highlandtechnology dott com > >> http://www.highlandtechnology.com > > > > Power supply and a power resistor, stick it on copper clad, > > cover if you wish. Adjust current to taste. > > > > George H. > > > > I have been meaning to make a little oven like that (but with a PID > controller), in a thermos (vacuum flask), for drying a few chips before > reflow, or curing epoxy, etc. > > There were some nice small vacuum flasks at ikea with a very wide mouth. > They don't insulate quite as well as others due to the wide mouth but it > is good for a tiny oven. > > If the power consumption is low then I could leave it on, so that I > don't have to wait for warm-up time when curing epoxy.
With more circuitry you can use a transistor as heater... I've got a lamp that runs at 150 C with a TIP121 as heater/pass element. (up to 200C for a few hours.) Melamine foam makes nice insulation.. again ~200C. George H.
fredag den 19. oktober 2018 kl. 00.57.04 UTC+2 skrev Chris Jones:
> On 19/10/2018 07:10, George Herold wrote: > > On Thursday, October 18, 2018 at 2:16:06 PM UTC-4, John Larkin wrote: > >> I put some epoxy on an EPC bga GaN fet to glob-top protect it. And > >> looked for a warm place to put the board to speed up the cure. LED > >> lights, switching power supplies, LCD scopes... there nothing warm any > >> more. > >> > >> > >> -- > >> > >> John Larkin Highland Technology, Inc > >> picosecond timing precision measurement > >> > >> jlarkin att highlandtechnology dott com > >> http://www.highlandtechnology.com > > > > Power supply and a power resistor, stick it on copper clad, > > cover if you wish. Adjust current to taste. > > > > George H. > > > > I have been meaning to make a little oven like that (but with a PID > controller), in a thermos (vacuum flask), for drying a few chips before > reflow, or curing epoxy, etc. > > There were some nice small vacuum flasks at ikea with a very wide mouth. > They don't insulate quite as well as others due to the wide mouth but it > is good for a tiny oven. > > If the power consumption is low then I could leave it on, so that I > don't have to wait for warm-up time when curing epoxy.
buy a $30 dehydrator?