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Search: Posts Made By: eccerr0r
Forum: Troubleshooting Audio Equipment Yesterday, 07:33 PM
Replies: 1
Views: 20
Posted By eccerr0r
Re: power speaker board

That TIP41C got mighty toasty. Catastrophic failure usually is caused by catastrophic issues... do you know what happened before it started frying these? This is not the first transistor it fried?...
Forum: Troubleshooting Audio Equipment Yesterday, 05:52 PM
Replies: 10
Views: 134
Posted By eccerr0r
Re: Sony ICF-C12W Radio Clock schematics (power)

The battery is a 6F22/PP3 and is likely offboard on the bottom of the unit if past experience with Sony "dream machines" goes.

It might just work with a step down 220V to 120V, else you'll need to...
Forum: Troubleshooting Audio Equipment Yesterday, 04:32 PM
Replies: 10
Views: 134
Posted By eccerr0r
Re: Sony ICF-C12W Radio Clock schematics (power)

Despite having a PP3 to backup the clock, I'd be surprised if it doesn't require line power for clock operation.

But it might actually autodetect 50/60Hz...
Forum: Troubleshooting Power Supplies and Power Supply Design 11-29-2021, 10:26 PM
Replies: 3,148
Views: 980,226
Posted By eccerr0r
Re: Power supply build quality pictorial. part 2

I'd imagine back when these Fuhjyyus were installed it was before the Antec era and efficiencies were even lower...

We'll see I suppose, so far they're surviving the time.
Forum: Equipment Usage, Soldering, Techniques, and Reviews 11-29-2021, 05:18 PM
Replies: 115
Views: 10,542
Posted By eccerr0r
Re: New tool to find short capacitors on motherboards : shorty with display

Well would be nice to go down to 100 Ω resolution, that would be an order of magnitude better than my 3466A which resolve down to 1 mΩ, ?? counts.
Forum: Troubleshooting Power Supplies and Power Supply Design 11-29-2021, 04:47 PM
Replies: 10
Views: 206
Posted By eccerr0r
Re: S-10-5 power supply schematic etc. 5V 2A

Should there be punycode here instead of *'s?
Forum: Equipment Usage, Soldering, Techniques, and Reviews 11-29-2021, 01:58 AM
Replies: 115
Views: 10,542
Posted By eccerr0r
Re: New tool to find short capacitors on motherboards : shorty with display

Damn... now that looks like something that might be useful.
Need to stop wanting to buy single use tools, or design one. Alas it's all in the op amp...and if I could find a 16-bit ADC in my junk...
Forum: General Electronics Technical Discussion 11-28-2021, 04:50 PM
Replies: 17
Views: 740
Posted By eccerr0r
Re: Op-amp preamp discussion

Generally a bipolar cap should be used when unsure. A polarized cap can be used if the circuit charges it the right way.
Forum: General Electronics Technical Discussion 11-28-2021, 04:46 PM
Replies: 12
Views: 373
Posted By eccerr0r
Re: Short theory

If this is the short theory, what's the long theory?
(ugh this thread's topic name "short theory" bothers me...)
Forum: Troubleshooting Power Supplies and Power Supply Design 11-28-2021, 01:16 PM
Replies: 9
Views: 1,015
Posted By eccerr0r
Re: ICT12012-10A Comm Series folds back under load (fixed)

[Threadjack]
Ahh ... was https://www.badcaps.net/forum/showpost.php?p=870731&postcount=18 not clear on what I did? I just soldered that 36K resistor on top of R318 so i cid not need to remove the...
Forum: General Electronics Technical Discussion 11-28-2021, 10:57 AM
Replies: 16
Views: 277
Posted By eccerr0r
Re: Frying amplifier finals... audio, not rf...

Wonder if that's better or what was used in the US - four real prongs instead of a single prong with 4 contacts ... https://www.oldphoneworks.com/4-prong-plug-male.html

Forgot the last time I saw...
Forum: Troubleshooting Power Supplies and Power Supply Design 11-28-2021, 10:27 AM
Replies: 9
Views: 1,015
Posted By eccerr0r
Re: ICT12012-10A Comm Series folds back under load (fixed)

PSU is a PSU of course of course... what's so special?

Then again I did mod it from 12V to 13.8V IIRC, but I had a vague recollection I or someone posted the mod somewhere.
Forum: General Electronics Technical Discussion 11-27-2021, 10:03 PM
Replies: 16
Views: 277
Posted By eccerr0r
Re: Frying amplifier finals... audio, not rf...

yay for design defects and shorts when you plug in phone plugs! As much as I like phone plugs for being generic and ubiquitous, if not designed properly they do short (notwithstanding as that organ...
Forum: Troubleshooting Audio Equipment 11-27-2021, 07:55 PM
Replies: 17
Views: 439
Posted By eccerr0r
Re: Onkyo HT-R510 turns on and then immediatly off

Could you measure the voltages with one decimal point of accuracy?

As of right now things don't make any sense. Ensure R5134 is intact but hard to imagine this failed, and still bettery yet...
Forum: General Electronics Technical Discussion 11-27-2021, 01:38 PM
Replies: 16
Views: 277
Posted By eccerr0r
Re: Frying amplifier finals... audio, not rf...

it is most definitely generating heat when both are turned on... Not a dead short but most definitely is drawing power that way. Crossover dissipation to an extreme.

It would just be the...
Forum: Troubleshooting Audio Equipment 11-27-2021, 01:05 PM
Replies: 17
Views: 439
Posted By eccerr0r
Re: Onkyo HT-R510 turns on and then immediatly off

Is that with Q6044 removed? Speaker attached?

What are the voltages at all pins of Q5044, you can use any ground you can access easily with the black/- probe...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 11-27-2021, 12:02 PM
Replies: 1,083
Views: 153,047
Posted By eccerr0r
Re: ESR meter upgrades

but still, you have a bank of solenoids, and one solenoid isn't working...well, something be a bad one on that circuit... (and then the TRIAC the AVRTransistortest pukes on...)
Forum: General Electronics Technical Discussion 11-27-2021, 11:44 AM
Replies: 16
Views: 277
Posted By eccerr0r
Re: Frying amplifier finals... audio, not rf...

drift happens ...but enough to cause it to leak too much and meltdown? Still if you have a bias current of 20mA and it goes to 50mA, it should still be able to tolerate the heat as it's still lower...
Forum: General Electronics Technical Discussion 11-27-2021, 10:34 AM
Replies: 16
Views: 277
Posted By eccerr0r
Re: Frying amplifier finals... audio, not rf...

Yow...so I suspect a lot of amps that end up on the repair bench were self inflicted wounds?

I'm surprised that a lot of pre-drivers go bad... or were they too self inflicted?

I guess I did get...
Forum: Troubleshooting Power Supplies and Power Supply Design 11-27-2021, 10:24 AM
Replies: 9
Views: 1,015
Posted By eccerr0r
Re: ICT12012-10A Comm Series folds back under load (fixed)

hams? use switching power supplies? Thought they'd all go Astron...

(eh... my VHF and UHF radios are connected to an Xbox PSU... yeah, so I use a switching PSU...)
Forum: Equipment Usage, Soldering, Techniques, and Reviews 11-27-2021, 10:03 AM
Replies: 1,083
Views: 153,047
Posted By eccerr0r
Re: ESR meter upgrades

would expect digitally used transistors to be fairly easy to check for operation... it's either on or off, if it doesn't turn it on completely, it's bad....
Forum: Troubleshooting Audio Equipment 11-27-2021, 09:45 AM
Replies: 8
Views: 315
Posted By eccerr0r
Re: do these look fake transistors to you ?

horrible indeed I^2*R - probably only an amp or so for an 8 ohm speaker. Probably a 2N4401 in a TIP42 case?!
Forum: General Electronics Technical Discussion 11-27-2021, 09:06 AM
Replies: 16
Views: 277
Posted By eccerr0r
Re: Frying amplifier finals... audio, not rf...

Interesting... but nothing self observed?
Self inflicted wounds is the most frequent cause of failure?
Was wonderring hiw often bias shifts cause enough leakage to self destruct...if cooling is...
Forum: Troubleshooting Audio Equipment 11-27-2021, 01:57 AM
Replies: 8
Views: 315
Posted By eccerr0r
Re: do these look fake transistors to you ?

Wow LOL, yeah that logo looks wrong.

Sigh so even BJTs have fakes...how many amps were you pumping through it before they blew, or it was just voltage?

Was looking at this MJE105 I have in my...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 11-27-2021, 01:02 AM
Replies: 7
Views: 216
Posted By eccerr0r
Re: Caseless Cheap Chinese electronic tools

Oh man, is that it? AVRTransistorTester is the only tool to have?

I guess I should someday get another frequency counter else i need to upgrade the one I have, need to jury rig some decade...
Showing results 1 to 25 of 500

 
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