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Search: Posts Made By: redwire
Forum: General Electronics Technical Discussion 05-27-2020, 01:30 PM
Replies: 15
Views: 326
Posted By redwire
Re: KORG Tuner GT-2 not working

To protect against reverse-polarity battery, I put a 1N4004 diode right across the battery input, so that shorts the battery but you can't really keep it on the snap for a long time. Or a series...
Forum: Troubleshooting Game Consoles & Other Weird Devices 05-26-2020, 04:36 PM
Replies: 14
Views: 222
Posted By redwire
Forum: Troubleshooting Game Consoles & Other Weird Devices 05-26-2020, 12:12 PM
Replies: 14
Views: 222
Posted By redwire
Re: Laminator blows fuses and trips the mains - but not when on my ispolation transfo

Look in the pic, the terminal block has melted and is shorting to the mounting screw.
Forum: General Electronics Technical Discussion 05-26-2020, 12:08 PM
Replies: 17
Views: 228
Posted By redwire
Re: Decorative Solar Lamp Question

Many small solar garden lamps are a square glass solar-array with hot glue underneath. One I put on a hot stove to soften the glue to pull the array out of the top plastic without melting that.
...
Forum: General Electronics Technical Discussion 05-24-2020, 07:28 PM
Replies: 17
Views: 228
Posted By redwire
Re: Decorative Solar Lamp Question

We'll need a pic of the backside. The solar array can be installed either on the top or the back side of the cover.
Either way, the solar array is pooched and it needs to come out if you want to...
Forum: General Electronics Technical Discussion 05-23-2020, 11:12 PM
Replies: 151
Views: 4,030
Posted By redwire
Re: Running a microcontroller in car - power supply aspects

I think you're right, I looked at the code and it would never shut off the pin-change interrupt on the Ignition switch input. It's been in the car for 2 years with no fatal troubles (i.e. dead car...
Forum: General Electronics Technical Discussion 05-23-2020, 08:40 PM
Replies: 151
Views: 4,030
Posted By redwire
Re: Running a microcontroller in car - power supply aspects

Those are bit-set and bit-clear instructions directly to MCU registers. What you are doing is reading the register, OR'ing 1 with the bit you want to (set) to a 1 (or AND'ing 0 with the bit you want...
Forum: General Electronics Technical Discussion 05-23-2020, 08:09 PM
Replies: 17
Views: 228
Posted By redwire
Re: Decorative Solar Lamp Question

Water getting in kills the interconnects or they bake in the sun and oxidize, and sometimes a cell can get cracked from hail. You likely have an open circuit.
I would load the (multimeter) with say...
Forum: General Electronics Technical Discussion 05-23-2020, 03:35 PM
Replies: 151
Views: 4,030
Posted By redwire
Re: Running a microcontroller in car - power supply aspects

It is easier to write software by breaking it down into little pieces. You can write out pseudo-code as it is called, just to nail down the big picture.
Then, you drill down into each piece, and do...
Forum: Troubleshooting Power Supplies and Power Supply Design 05-23-2020, 03:21 PM
Replies: 4
Views: 153
Posted By redwire
Re: Samlex SEC-14 linear power supply 13.8VDC 10A repair

The power supply works- the capacitors are still alive. Not sure why it got thrown out, maybe it just stunk up the place :jester: I wouldn't run those caps, worried they would vent.
Here are the...
Forum: Troubleshooting Game Consoles & Other Weird Devices 05-21-2020, 06:39 PM
Replies: 5
Views: 189
Posted By redwire
Re: HDD Spins up and down again at power on

Recheck your work cleaning the head connections, you seem to have made it worse? The copper gets oxidized and maybe you don't have the spring pressure. You have to clean both ends.
The drive spins...
Forum: Troubleshooting Power Supplies and Power Supply Design 05-21-2020, 04:51 PM
Replies: 4
Views: 153
Posted By redwire
Samlex SEC-14 linear power supply 13.8VDC 10A repair

Repairing a Samlex SEC-14 linear power supply, rated 13.8VDC "10-14A". Hong Kong company.

Dumpster rescue, main pc board is RPS-1203 with two filter cap pc boards labelled RPS1220. The same...
Forum: General Electronics Technical Discussion 05-18-2020, 06:28 PM
Replies: 26
Views: 832
Posted By redwire
Re: Fluke 23 Fusible Resistor

Just a follow up- the 1k 2W Ohmite OY102KE resistor is huge... almost an inch.
I think it's the smaller 1W OX102KE what is used in the Fluke multimeters? Brymen 867 also uses the 1W part, based on...
Forum: Other Devices with Bad Capacitors 05-18-2020, 03:05 PM
Replies: 27
Views: 6,849
Posted By redwire
Re: Refrigerator Control Board WPW10310240

Big capacitor C5 is way crooked! too crooked... and there is felt pen markings on the board so someone has replaced it, likely with a part too tall. D5 is pushed over as well. Like somebody tried to...
Forum: General Computer & Tech Discussion 05-17-2020, 04:08 PM
Replies: 7
Views: 197
Posted By redwire
Re: Design my own case or buy one?

It's a hard call - custom or not. I don't see you asking for anything really way out there.

I found Lian Li excellent quality, expensive now and with dumb configurations i.e. no room for big...
Forum: General Electronics Technical Discussion 05-12-2020, 03:16 PM
Replies: 15
Views: 326
Posted By redwire
Re: KORG Tuner GT-2 not working

IC1 connects to the MCU reset pin 28. It's got 2KB ROM and 128 bytes of RAM.
Can't see a need for DSP lol
Forum: General Electronics Technical Discussion 05-12-2020, 01:27 PM
Replies: 15
Views: 326
Posted By redwire
Re: KORG Tuner GT-2 not working

I don't see any reverse-polarity protection, so the 78L05 voltage reg might be damaged if somebody tapped the battery backwards. Or there is an overload on the 5V rail. It should output 5V even with...
Forum: Troubleshooting Power Supplies and Power Supply Design 05-12-2020, 12:32 PM
Replies: 29
Views: 1,515
Posted By redwire
Forum: General Electronics Technical Discussion 05-11-2020, 12:43 PM
Replies: 151
Views: 4,030
Posted By redwire
Re: Running a microcontroller in car - power supply aspects

Here are snippets of my Arduino code. There is an AVR sleep library. (http://www.nongnu.org/avr-libc/user-manual/modules.html)
First, I have a pin change interrupt (on IGN and pushbutton input) to...
Forum: General Electronics Technical Discussion 05-11-2020, 11:37 AM
Replies: 151
Views: 4,030
Posted By redwire
Re: Running a microcontroller in car - power supply aspects

Ahhh much better current drain :) You need that extra 4mA for the MCU :goofy:

I made a car key-off timer with ATtiny85 with LP2951, to charge phone or listen to stereo for 3hrs if you push a...
Forum: General Electronics Technical Discussion 05-09-2020, 05:04 PM
Replies: 51
Views: 968
Posted By redwire
Re: Electric oven tripping circuit breaker after turned on for 3-5 minutes

Old ovens were just exposed wirewound nichrome and I know a woman that got zapped, the aluminium foil hit the element and it arced to ground, even though the oven was off. So much for a working DPDT...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 05-09-2020, 04:52 PM
Replies: 9
Views: 246
Posted By redwire
Re: UT210E clamp meter amps measurements wrong

You can accidentally magnetize the jaws just going close to a magnet, your RC motors could do it if you bumped a motor.
Take a small steel screw or nut or washer (that is not magnetized at all) and...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 05-09-2020, 01:39 PM
Replies: 9
Views: 246
Posted By redwire
Re: UT210E clamp meter amps measurements wrong

First check if the iron jaws are magnetized, they probably need degaussing.

Small chance the Hall sensors offset/cal has gone bad. There are three trimpots on the main board VR+, VR-, VR4 but I'm...
Forum: General Electronics Technical Discussion 05-08-2020, 02:12 PM
Replies: 151
Views: 4,030
Posted By redwire
Re: Running a microcontroller in car - power supply aspects

Just try pull the Vreg IC out of the socket, then you can see if it is ahaed or after, the current drain.
I find chinese electrolytics have high leakage currents.
Forum: General Electronics Technical Discussion 05-08-2020, 12:37 PM
Replies: 151
Views: 4,030
Posted By redwire
Re: Running a microcontroller in car - power supply aspects

It just seems weird, I would go after it because it's high.
You can try pull IC's out of their sockets and see if that narrows it down? But remember the cap has a charge before putting the IC back...
Showing results 1 to 25 of 500

 
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