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Search: Posts Made By: eccerr0r
Forum: Troubleshooting Power Supplies and Power Supply Design Today, 07:47 AM
Replies: 2
Views: 48
Posted By eccerr0r
Re: operational amplifier used in a ups(LM324)

Having 220v(N)_IN hooked up to pin 8 of the LM324 is illogical...

Typically these op amps are used to detect phase(and thus availability of line voltage), zero crossings, and overload of the line....
Forum: Troubleshooting Laptops, Portable, and Mobile Devices Yesterday, 04:52 PM
Replies: 8
Views: 71
Posted By eccerr0r
Re: Challenging question on DDR4 identification needs expert to answer. Help?

Ever since SDRAM memory has been identified per slot with a serial presence detect EEPROM. The firmware scans each slot for this EEPROM and then proceeds to test each module based on the data in the...
Forum: General Electronics Technical Discussion Yesterday, 04:42 PM
Replies: 8
Views: 135
Posted By eccerr0r
Re: Help me understand something I thought I understood about electricity

It would be good to know exactly what device it is, and perhaps know how it's built. Sometimes it will work, sometimes it wont.

I have a pretty nasty example of what won't work after doing some...
Forum: General Electronics Technical Discussion 08-19-2019, 05:05 PM
Replies: 18
Views: 193
Posted By eccerr0r
Re: Upgrading my E-bike. Building a battery pack

always a combination of things that go wrong at the same time and can't recover...
Forum: General Electronics Technical Discussion 08-19-2019, 10:12 AM
Replies: 18
Views: 193
Posted By eccerr0r
Re: Upgrading my E-bike. Building a battery pack

Sigh, finding cheap reliable batteries are hard... even when weight isn't a great concern. Would be nice to get a large bank of even lead acid batteries for energy storage...
Forum: General Electronics Technical Discussion 08-18-2019, 04:15 PM
Replies: 11
Views: 440
Posted By eccerr0r
Re: Will this work?

Yeah only need one pull up or pull down transistor to turn the motor on/off. Probably easier to do N-channel pull down when doing the level shift from 5V control to 12V output. And yes, as budm...
Forum: General Electronics Technical Discussion 08-17-2019, 09:31 PM
Replies: 11
Views: 440
Posted By eccerr0r
Re: Will this work?

No, it will not measure the temperature of the room.

Nor will the motor turn.
Forum: General Electronics Technical Discussion 08-17-2019, 11:46 AM
Replies: 42
Views: 466
Posted By eccerr0r
Re: Delay on-instant off with 555 timer

Ideally the inrush NTC/PTC thermistors run on their own without the need for the shunting relay.

Both will work if the expected operating temperature is where you expect the circuit to run.

NTC...
Forum: General Electronics Technical Discussion 08-15-2019, 03:27 PM
Replies: 42
Views: 466
Posted By eccerr0r
Re: Delay on-instant off with 555 timer

okay, I think my circuit will work... pretty sure. Of course a microcontroller does it all in software though I think it may still need a driver transistor, though you lose that ugly 100F timing...
Forum: General Electronics Technical Discussion 08-15-2019, 11:34 AM
Replies: 42
Views: 466
Posted By eccerr0r
Re: Delay on-instant off with 555 timer

Now I'm confused, didn't that youtube video in your first post explain what you wanted to do, and this thread was meant for something else? I mean, no pushbutton is needed at all which is confusing...
Forum: General Electronics Technical Discussion 08-15-2019, 06:30 AM
Replies: 42
Views: 466
Posted By eccerr0r
Re: Delay on-instant off with 555 timer

For me, "Headspice". You use whatever you want to simulate it.





- simulated in my head.
Forum: General Electronics Technical Discussion 08-14-2019, 05:49 PM
Replies: 42
Views: 466
Posted By eccerr0r
Re: Delay on-instant off with 555 timer

Oh...btw, if you had a NC momentary switch, there is a trivial solution :)
I guess the assumption is that we had a NO switch.
Forum: General Electronics Technical Discussion 08-14-2019, 03:31 PM
Replies: 42
Views: 466
Posted By eccerr0r
Re: Delay on-instant off with 555 timer

Untested, I should just stick it in the simulator but too lazy.
Forum: Troubleshooting Power Supplies and Power Supply Design 08-13-2019, 02:41 PM
Replies: 6
Views: 289
Posted By eccerr0r
Re: Fun with a new 100W power supply...

Step one success! Interfaced a 2N3055 external switch transistor and huge inductor to a MC34063 to get 12V from the panel. It passes enough current to let a 120VAC inverter run without a battery...
Forum: General Computer Discussion 08-13-2019, 02:32 PM
Replies: 17
Views: 143
Posted By eccerr0r
Re: SCSI controller problem

Back in the day, what you sold worked, there is no second chance with a firmware upgrade.

I don't know about SCSI as I don't recall doing this before, but definitely some PATA drives will not spin...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-12-2019, 12:19 PM
Replies: 23
Views: 517
Posted By eccerr0r
Re: Raidmax RX-600 ringing noise and 0ms PG

It was near the op amp on the PSU... So I guess supervisor chip on yours. Yeah SMD sucks, double sided SMD sucks more, and double sided daughter boards with SMD is worst.
Forum: Troubleshooting Power Supplies and Power Supply Design 08-12-2019, 02:56 AM
Replies: 6
Views: 289
Posted By eccerr0r
Re: Fun with a new 100W power supply...

Yeah I was thinking about attaching a panel to my car to run a drink cooler too, though not sure where to dump the heat from such -- at least running the car's dash fans is a possibility as long as...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-12-2019, 02:43 AM
Replies: 23
Views: 517
Posted By eccerr0r
Re: Raidmax RX-600 ringing noise and 0ms PG

The PG problem reminds me of one cheapo PSU that I repaired many years ago. Turned out a ceramic disc cap shorted out, and tricked the PG to always be no good. So much for annoying debug efforts! ...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 08-09-2019, 02:00 AM
Replies: 964
Views: 93,045
Posted By eccerr0r
Re: component testers

Right, but those dc-dc converters are not well suited for testing DIACs :D
(Effectively the best thing for testing DIACs is a curve tracer type functionality...)
Forum: Equipment Usage, Soldering, Techniques, and Reviews 08-08-2019, 10:01 AM
Replies: 964
Views: 93,045
Posted By eccerr0r
Re: component testers

Not quite two zeners... at least to prove if it works properly.

Plus these component testers don't directly do high voltage zeners either...

Speaking of weird devices, it probably can't figure...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 08-08-2019, 07:47 AM
Replies: 964
Views: 93,045
Posted By eccerr0r
Re: component testers

I have a few UJTs in my junk pile, but not PUTs or SCSs. Yeah probably should show up as two diodes or something to that extent. (Incidentally, how could SCS be tested? has more than 3 pins...)
...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 08-07-2019, 08:54 PM
Replies: 964
Views: 93,045
Posted By eccerr0r
Re: component testers

Anyone have a PUT or UJT to play with on these testers?
SCS?

I suppose DIACs are more available but testing such on these things are going to be tough?
Forum: Troubleshooting Power Supplies and Power Supply Design 08-06-2019, 03:47 PM
Replies: 6
Views: 289
Posted By eccerr0r
Re: Fun with a new 100W power supply...

Funny that MC-4 connectors sort of mesh with banana jacks and plugs... ha...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-06-2019, 07:30 AM
Replies: 6
Views: 289
Posted By eccerr0r
Re: Fun with a new 100W power supply...

LOL yeah I was intentionally ambiguous as a solar panel would not be considered a power supply in a normal sense, but it is one of those things that really sources electrical power instead of just...
Forum: General Computer Discussion 08-02-2019, 02:05 PM
Replies: 31
Views: 1,070
Posted By eccerr0r
Re: RAID5 failure: 2 bad HDD's at the same time

No, RAID1 is not backup, not any more RAID3, RAID5, or even RAID6.

An off disk backup will protect you from rm -rf / . RAID of any level will not protect you.

There is something to be said...
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