UGG worked then it didn't
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Vince Loschiavo
Hi all,
Got Teensy loaded, JackAl built, and interfaced with the display. All voltage measurements good to go, Got the display up, can see that the teensy was programmed correctly, but after several seconds (no touch but not worried about that at the moment). Display shut down. weird all voltages still good all over the board. (yea notice no heatsink on the 3.3 reg or 5v reg( will get to that). any quick suggestions that i should take a look at? any way to get the display powered up and get some kind of display to check that separately? Vince |
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We have almost doubled the size of the 3.3V regulator because it does get very toasty! Because I run the ?BITX at 12V, it's that regulator that needs an air flow more than the PA transistors. Right now, I'm just running it on a breadboard with a large heat sink, but I have a very small (1.25") fan that will cool it and is very quiet in both an audio and interference sense. If I start using any of the digital modes, I think I'll use one of the empty JackAl pins with a temperature sensor to turn on a second fan over the PA transistors. Jack, W8TEE
On Thursday, March 14, 2019, 4:13:38 PM EDT, Rick Price <rickprice48@...> wrote:
The 3.3 regulator has to have a heat sink or it will go into
thermal shutdown, and sounds like what is happening to yours.? The display
drawa a lot of current.? My heat sink, a CPU finned?block which I
tapped for a screw gets very, very hot.?It is at least twice the size of a
normal TO220 heatsink.? Remember to isolate the heat sink from the
regulator as the tab on the 3.3V is common to the output and cannot be grounded.
?
Rick
KN4AIE From: [email protected] [mailto:[email protected]] On Behalf Of Vince Loschiavo Sent: Thursday, March 14, 2019 4:07 PM To: [email protected] Subject: [JackAl] UGG worked then it didn't Got Teensy loaded, JackAl built, and interfaced with the display. All voltage measurements good to go, Got the display up, can see that the teensy was programmed correctly, but after several seconds (no touch but not worried about that at the moment). Display shut down. weird all voltages still good all over the board. (yea notice no heatsink on the 3.3 reg or 5v reg( will get to that). any quick suggestions that i should take a look at? any way to get the display powered up and get some kind of display to check that separately? Vince |
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Put some air flow on the 3.3V regulator and see what happens. Jack, W8TEE
On Thursday, March 14, 2019, 4:06:43 PM EDT, Vince Loschiavo <vince320@...> wrote:
Hi all, Got Teensy loaded, JackAl built, and interfaced with the display. All voltage measurements good to go, Got the display up, can see that the teensy was programmed correctly, but after several seconds (no touch but not worried about that at the moment). Display shut down. weird all voltages still good all over the board. (yea notice no heatsink on the 3.3 reg or 5v reg( will get to that). any quick suggestions that i should take a look at? any way to get the display powered up and get some kind of display to check that separately? Vince |
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Vince Loschiavo
So...
yes the 3.3 went into thermal shutdown,? Temp heat sink and a fan and all is good. so Thinking it might have been the Teensy, i had cut the jumper between the 2 pads on the bottom (5v) when I took the teensy home to reprogram (load blink to see if it was alive)...the computer didn't recognize the teensy. so solder bridge'd the pads and all ok.. blink worked then reloaded the JackAl software... today all good... now for the calibration. Thanks all. vince n2aie |
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