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Search: Posts Made By: stj
Forum: Troubleshooting Power Supplies and Power Supply Design Yesterday, 08:05 PM
Replies: 5
Views: 98
Posted By stj
Re: S-10-5 power supply schematic etc. 5V 2A

you probably need to ask on a cb radio forum with that output
Forum: Troubleshooting Power Supplies and Power Supply Design Yesterday, 06:21 PM
Replies: 5
Views: 98
Posted By stj
Re: S-10-5 power supply schematic etc. 5V 2A

i would only buy MeanWell stuff at this point.
they arent piss-cheap but they arent crap either :D
https://meanwellonline.aliexpress.com/store/5429250
Forum: General Electronics Technical Discussion Yesterday, 06:12 PM
Replies: 16
Views: 246
Posted By stj
Re: Frying amplifier finals... audio, not rf...

that 4pin is o.k. because you wont short the contacts by hot-plugging one.

it's not quite as good as the old french plugs though....
Forum: General Computer & Tech Discussion Yesterday, 08:48 AM
Replies: 2
Views: 55
Posted By stj
Re: Limit battery charging percentage through EC registers

i hope you dont kill the battery,
modern packs have a microcontroller in them that has a charge-counter among other things.
Forum: Troubleshooting Power Supplies and Power Supply Design Yesterday, 08:46 AM
Replies: 4
Views: 102
Posted By stj
Re: Honda generator inverter 230v 1900uf caps

if you removed the cap, isnt the polarity marked on the board?
Forum: General Electronics Technical Discussion Yesterday, 04:42 AM
Replies: 16
Views: 246
Posted By stj
Re: Frying amplifier finals... audio, not rf...

i dont blame baofeng for that, it's called a "kenwood" connector for a reason.

jack plugs are shit though, i killed some small psu's in the past that used a 3.5mm jack to connect to the device...
Forum: General Capacitor Questions & Issues 11-27-2021, 07:20 PM
Replies: 3
Views: 98
Posted By stj
Re: Lelon quality

thats a high stress area, most caps will fail relativly fast on PFC circuits.
Forum: General Capacitor Questions & Issues 11-27-2021, 05:22 PM
Replies: 3
Views: 98
Posted By stj
Re: Lelon quality

i dont see anything wrong with them,
just dont put them in something that gets hot.
Forum: Troubleshooting Power Supplies and Power Supply Design 11-27-2021, 05:19 PM
Replies: 3
Views: 119
Posted By stj
Re: Sony ADP-200ER Ps4 Power Supply

i dont know what it should read, but i expect to see a much higher reading!
Forum: Troubleshooting Power Supplies and Power Supply Design 11-27-2021, 02:40 PM
Replies: 3
Views: 119
Posted By stj
Re: Sony ADP-200ER Ps4 Power Supply

the unductor (pfc choke)
is just a coil, it's supposed to look like a short.
put it in your component tester and check the inductance.
Forum: General Electronics Technical Discussion 11-27-2021, 01:54 PM
Replies: 16
Views: 246
Posted By stj
Re: Frying amplifier finals... audio, not rf...

the output transistors often go open internally - probably melted bond wires.
and sometimes they crack or shatter the resin casing
Forum: General Electronics Technical Discussion 11-27-2021, 01:29 PM
Replies: 16
Views: 246
Posted By stj
Re: Frying amplifier finals... audio, not rf...

it's not heat, if the bias goes out of balance on a push/pull output circuit the transistors drive into each other and create a dead short
if your lucky the amp has seperate internal fuses on the +...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 11-27-2021, 01:26 PM
Replies: 1,083
Views: 152,722
Posted By stj
Re: ESR meter upgrades

but you dont have a wiring / loom schematic if the customer just brings the board.
i dont want slot machines delivered just to fix a control pcb

besides, you often spot parts that are "almost"...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 11-27-2021, 11:27 AM
Replies: 1,083
Views: 152,722
Posted By stj
Re: ESR meter upgrades

not so easy though when they are fired with short pulses and drive triac gates. :(
(solenoid drivers)
Forum: General Electronics Technical Discussion 11-27-2021, 11:24 AM
Replies: 16
Views: 246
Posted By stj
Re: Frying amplifier finals... audio, not rf...

it depends on age.
i see a lot of 70's and 80's stuff - drifted values on resistors and caps is common.

there is a french guy who is reverse engineering a lot of stk stuff to create clones btw.
Forum: General Electronics Technical Discussion 11-27-2021, 05:39 AM
Replies: 16
Views: 246
Posted By stj
Re: Frying amplifier finals... audio, not rf...

i often help a guy fixing amps - dont get them myself.

the most common cause of final destruction is faulty bits in the pre-drive either overdriving the finals or turning both parts of a push/pull...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 11-27-2021, 05:34 AM
Replies: 7
Views: 206
Posted By stj
Re: Caseless Cheap Chinese electronic tools

my counter goes to 2.4GHz

the tools you buy will be dictated by what your doing.

my usb-serial convertor is mostly for flashing routers.
my frequency counter is for checking radio's
my pwm...
Forum: Troubleshooting Computer Displays 11-25-2021, 09:00 AM
Replies: 2
Views: 92
Posted By stj
Re: Apple IIgs RGB Color Monitor (A2M6014x)

i hope you have a dummy load on B+ like a 40w lamp.

pull J22 and see what happens - just to eliminate the possibility of an intermittent short in the primary capacitor.
Forum: General Capacitor Questions & Issues 11-25-2021, 08:49 AM
Replies: 1
Views: 65
Posted By stj
Re: question capacitor ceramic smd

no.
and electrolytics take many years to depolarise anyway.
Forum: General Computer & Tech Discussion 11-25-2021, 02:49 AM
Replies: 8
Views: 133
Posted By stj
Re: what to do with faulty hard drives?

sell the boards - people buy them for data recovery
Forum: General Electronics Technical Discussion 11-24-2021, 11:50 AM
Replies: 11
Views: 322
Posted By stj
Re: Short theory

test, then test with the probes switched.
if it's charging caps then you will see a jump in readings for a second
Forum: Equipment Usage, Soldering, Techniques, and Reviews 11-23-2021, 06:45 PM
Replies: 7
Views: 206
Posted By stj
Re: Caseless Cheap Chinese electronic tools

most used is my component tester,
then my usb-serial(3.3v) adapter,
then probably my €12 8digit frequency counter!!!
i also have a fully programable pwm generator - but that dont count because it...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 11-23-2021, 06:41 PM
Replies: 1,083
Views: 152,722
Posted By stj
Re: ESR meter upgrades

your not working on digital stuff then.

i recently pulled 16 transistors that powered solenoids,
didnt know the spec so just compared them to find the odd one(s) out.
Forum: General Electronics Technical Discussion 11-23-2021, 06:35 PM
Replies: 11
Views: 322
Posted By stj
Re: Short theory

wrong, your meter is supplying power.
thats how it works, it applies a current limited voltage - usually 2-3v and calculates resistance from the volt-drop
Forum: General Electronics Technical Discussion 11-23-2021, 03:57 AM
Replies: 11
Views: 322
Posted By stj
Re: Short theory

caps can look shorted while they charge.
Showing results 1 to 25 of 500

 
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