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Search: Posts Made By: stj
Forum: General Electronics Technical Discussion Today, 12:18 PM
Replies: 49
Views: 1,298
Posted By stj
Re: Has anyone had issues with Rayovac Alkaline batteries leaking

in europe they have stickers saying to use a lithium pp3,
the latest models are sealed with a 10year life, then you throw it away (or mod it!)

i use these:
Forum: Troubleshooting Audio Equipment Today, 07:34 AM
Replies: 2
Views: 46
Posted By stj
Re: Revenge lil Rock 5 repair

lol
when a saw the name i thought it was a graphics card! :D
Forum: General Computer & Tech Discussion Today, 04:17 AM
Replies: 11
Views: 169
Posted By stj
Re: Amish Computer - No, this is not a joke!

cant you id the accounting software from the filetypes it saves or the copywrite / about box?

btw, how the hell does it stay cool with just a small vent?
Forum: General Electronics Technical Discussion Today, 04:11 AM
Replies: 49
Views: 1,298
Posted By stj
Re: Has anyone had issues with Rayovac Alkaline batteries leaking

arent you supposed to use lithium in smoke detectors? :D
Forum: Troubleshooting Power Supplies and Power Supply Design Yesterday, 10:19 AM
Replies: 24
Views: 397
Posted By stj
Re: iMac A1224 PSU, 614-0421 - no standby voltages

thermister - for reading the heatsink temp
Forum: Troubleshooting Audio Equipment Yesterday, 02:11 AM
Replies: 4
Views: 120
Posted By stj
Re: Think I would need to recap this?

you could charge the caps with some AA batteries just to reduce the chances of them being de-polarised
or even better if you have a bench supply with a computer interface.
Forum: Troubleshooting Game Consoles & Other Weird Devices 10-13-2021, 07:51 AM
Replies: 17
Views: 508
Posted By stj
Re: PC Engine GT - No Video or Backlight

it doesnt have a video signal, the display is fed a clocked raster from the custom Hudson chipset

maybe you can just mod the backlight to use leds
Forum: Troubleshooting Power Supplies and Power Supply Design 10-13-2021, 07:47 AM
Replies: 24
Views: 397
Posted By stj
Re: iMac A1224 PSU, 614-0421 - no standby voltages

transformer seconary before diodes or after?
Forum: Equipment Usage, Soldering, Techniques, and Reviews 10-13-2021, 04:17 AM
Replies: 45
Views: 12,163
Posted By stj
Re: Using my CH341A.

3.3v on what adapter?
Forum: Troubleshooting Power Supplies and Power Supply Design 10-13-2021, 04:14 AM
Replies: 24
Views: 397
Posted By stj
Re: iMac A1224 PSU, 614-0421 - no standby voltages

test the big mains caps - as it has pfc

the yellow tester in the acrylic is a T4
not sure about the other one - never seen that before.
wanna take internal pcb pics?
Forum: General Computer & Tech Discussion 10-13-2021, 04:09 AM
Replies: 9
Views: 185
Posted By stj
Re: I finally got one too! a new monitor! and my first ips panel to boot!

ccfl 4:3 for the win!

of course all my monitors where free,
but if i actually had to pay for one, it would be IPS and have all the inputs on it, VGA,DV-I,HDMI etc.
the asus ones look nice.
Forum: Troubleshooting Power Supplies and Power Supply Design 10-12-2021, 03:43 PM
Replies: 24
Views: 397
Posted By stj
Re: iMac A1224 PSU, 614-0421 - no standby voltages

post pictures of them - so i know the hardware they are based on.
Forum: Troubleshooting Power Supplies and Power Supply Design 10-12-2021, 02:13 PM
Replies: 24
Views: 397
Posted By stj
Re: iMac A1224 PSU, 614-0421 - no standby voltages

the 22uf cap has internal leakage fooling the tester - it's fucked as expected. :)

maybe you should update the tester firmware and change the crystal too.
Forum: Troubleshooting Power Supplies and Power Supply Design 10-12-2021, 01:32 PM
Replies: 24
Views: 397
Posted By stj
Re: iMac A1224 PSU, 614-0421 - no standby voltages

it does not matter that the caps dont look shorted or open, what matters is they still have the ability to store enough mA of current.
do an ESR test.

as for PFC - it's a fucked up concept - yes,...
Forum: Troubleshooting Power Supplies and Power Supply Design 10-12-2021, 10:22 AM
Replies: 24
Views: 397
Posted By stj
Re: iMac A1224 PSU, 614-0421 - no standby voltages

fets can be deceptive unless you use a component tester
a lot of multimeters cant get clean readings from schottky diodes either.

so lets talk basics about switching psu's
the chip needs power,...
Forum: Troubleshooting Audio Equipment 10-12-2021, 10:14 AM
Replies: 3
Views: 127
Posted By stj
Re: roberts dab mpsound 43 circuit

you dont get luck if you use the devil's search engine - you get targetted marketing.

if you use yandex you get this:
https://www.ti.com/product/TPA3100D2

although i already knew it was a Ti...
Forum: Troubleshooting Game Consoles & Other Weird Devices 10-12-2021, 03:33 AM
Replies: 29
Views: 6,120
Posted By stj
Forum: General Electronics Technical Discussion 10-10-2021, 02:52 PM
Replies: 8
Views: 301
Posted By stj
Re: My Uni-T died... looking for a replacement

best meter for electronics IMO is UNI-T UT-61e (NOT the new mk2 version)
very good price too.
Forum: General Electronics Technical Discussion 10-10-2021, 08:12 AM
Replies: 8
Views: 301
Posted By stj
Re: My Uni-T died... looking for a replacement

for electrical work?
or electronics?

your 139c has a bad or corrupt eeprom - very unusual to happen btw
Forum: General Capacitor Questions & Issues 10-10-2021, 03:02 AM
Replies: 1
Views: 97
Posted By stj
Forum: General Electronics Technical Discussion 10-10-2021, 03:00 AM
Replies: 2
Views: 140
Posted By stj
Re: SMD electrolytics

probably - read some datasheets
Forum: Troubleshooting Game Consoles & Other Weird Devices 10-10-2021, 03:00 AM
Replies: 17
Views: 508
Posted By stj
Re: PC Engine GT - No Video or Backlight

look inside the metal can
Forum: General Electronics Technical Discussion 10-09-2021, 12:16 PM
Replies: 2
Views: 120
Posted By stj
Re: Has anyone used this device “ ISDT BattGo BG-8S Battery Meter” before feedback wa

a lot of batgo stuff has been reviewed.
https://www.youtube.com/c/Rchelicopterfun/videos
https://www.youtube.com/user/julius256/videos
Forum: Troubleshooting Audio Equipment 10-08-2021, 04:40 AM
Replies: 15
Views: 1,939
Posted By stj
Re: JBL S412PII Speakers – Distorted Bass Repair and Updated Schematics

check all the solder joints for that type of issue
Forum: Equipment Usage, Soldering, Techniques, and Reviews 10-08-2021, 04:06 AM
Replies: 3
Views: 208
Posted By stj
Re: Radio Shack 2200813 29 range DVM

show the whole board so we can see the chips
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