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Raduino temp
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Michael Davis
?Has anyone addressed the raduino power transistor heat issue? Maybe it can withstand a significant rise in temperature without using a heat sink. Much has been discussed around the PA temperature and larger heat sink if operating it at 20 volts, bu I haven't noticed any discussion on the raduino. Also, can the very bright display backlight be dimmed a bit? Thanks |
开云体育I replaced the display with a non backlit display. ?I added a piece of metal to the tab of the regulator. It can withstand the temps but the metal added some mass as a heatsink 73? Larry KB3CUF Sent from my Galaxy Tab? E -------- Original message -------- From: Michael Davis <maddmd818@...> Date: 3/2/2017 18:05 (GMT-05:00) Subject: [BITX20] Raduino temp ?Has anyone addressed the raduino power transistor heat issue? Maybe it can withstand a significant rise in temperature without using a heat sink. Much has been discussed around the PA temperature and larger heat sink if operating it at 20 volts, bu I haven't noticed any discussion on the raduino. Also, can the very bright display backlight be dimmed a bit? Thanks |
开云体育The backlight can be dimmed by putting a resistor in series with the LED anode pin on the display (pin 15 on most displays).? Since the current draw varies widely with the color of the backlight LEDs you will have to experiment.? If you can, measure the current into pin 15 and then calculate a resistance that will reduce the current by 75% or so and see if the brightness is about what you want.? Then go from there. Mike N. K5ESS ? From: [email protected] [mailto:[email protected]] On Behalf Of Michael Davis ? ?Has anyone addressed the raduino power transistor heat issue? Maybe it can withstand a significant rise in temperature without using a heat sink. Much has been discussed around the PA temperature and larger heat sink if operating it at 20 volts, bu I haven't noticed any discussion on the raduino. Also, can the very bright display backlight be dimmed a bit? Thanks |
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Ed Vignati
You can also, like I did is remove resistor 111, add 2 wires to go to a 1K potentiometer. Either lead going to the pot, install a 100 ohm? resistor, so you don't over drive the LCD backlight. ? Works great for adjusting to different background (inside the house, outside at the beach, ect.) ?lighting Eddie - kj4fgi |
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Yes, but it is about 3x the price that you can get them for from e-bay.
They are available in several colors; I like the blue with white characters. Also common is red with black letters. The "original" is green with white characters. They are all parallel input devices. If the ad claims them to be "Arduino compatible", then they are the right displays. They come in several versions and pinouts; essentially the 14 pin version has no backlight and the 16 pin version does. Note that 16 pins is standard, however. A given unit may have 16 pins, but may not have a backlight. There is another standard pinout which uses two rows of 8 pins. The connection is the same. Another variation (which is quite recent) uses a piggyback board to provide for serial connections, usually SDA and SCL (but it could be the hardware serial port or any two pins with software serial). An even more recent version incorporates the serial translation into the lcd itself. These will also work for our purposes. All of these devices have datasheets available somewhere. Find the one which goes with yours. They contain much very useful information, especially on software control. john AD5YE |
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I pulled that regulator out of the Raduino and reinstalled on the other side of the board, using the same 3 holes. ?Lies flat on the ground plane, could solder the tab to the ground plane if a heat sink was ever deemed necessary (regulator tab is ground). ?HFSigs really should be mounting them all that way, and moving the contrast knob to the bottom of the Raduino while they are at it. Jerry, KE7ER On Mon, Mar 6, 2017 at 04:06 pm, Joel Caulkins wrote:
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HFSigs builds the Raduino board from scratch, it has the Si5351 on it. ?No reason not to mount the regulator and pot from the other side of the board when they do ? It uses a standard Arduino Nano processor and a standard 16x2 display. On Mon, Mar 6, 2017 at 05:09 pm, Ed Vignati wrote:
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Well, got my Bitx40 over the weekend, ?Wired it up and it doesn't work.? That is, the hiss from the speaker can be volume controlled.? The display has all blackened row of pixels.? Tuning will not respond even with antenna connected. Connected a dummy load and PTT brings up the xmiter and additional current draw.? However no response from the mic.? The rArduino shows the power ON led working.? The display pot works.? Pressing the Arduino reset button seem not to do much.? I have several of the Arduino Nano here.? I may have lost the sketch for the Bitx 40.? If I had the code I could down load it again.? Yes -I triple checked my wiring.? Disappointed that it isn't responding.? I got the instructions for assembly off the HFSIGS web site.? I suppose it'll mean oscope time...wasn't planning to make this a career HI ?It may still turn out to be something goofy (I hope), ?I'm hoping there is a Sketch listed somewhere. ?any ideas will be appreciated. 73 WA9DOH Larry On Mon, Mar 6, 2017 at 7:09 PM, Ed Vignati <kj4fgi@...> wrote:
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?I suppose you are his spokesman??The BITX40 will inspire you to experiment. Modify it, mount it, tweak it, change it.? Also stated;?Raduino is a standard Arduino Nano ?? He doesn't build these. ? That's not a an excuse (That's not for a failed product out of the box) He states they are checked out. Larry On Tue, Mar 7, 2017 at 4:39 AM, Larry Smith <815cpu@...> wrote:
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College Professor Simon Thompson
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Joel Caulkins/N6ALT