Forum: General Electronics Technical Discussion
Yesterday, 08:04 PM
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Replies: 8
Views: 158
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Forum: General Electronics Technical Discussion
05-21-2022, 09:21 PM
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Replies: 8
Views: 158
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Forum: Equipment Usage, Soldering, Techniques, and Reviews
05-21-2022, 09:14 PM
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Replies: 6
Views: 399
Re: Hot air station - 858D opinions?
My 110V 858D+ came with a 220V heater. So you get about 200W only. It actually works OK on the usual smaller SMT but I would say heat is not enough for big stuff.
220V heater is 805W at 240VAC, 71.6...
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Forum: Troubleshooting Game Consoles & Other Weird Devices
05-20-2022, 03:11 PM
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Replies: 3
Views: 99
Re: Thermador Oven Controler Dim display
OMG price gouging for these boards is criminal!
Repair your oven control board by replacing $5 worth of capacitors! Just to stop from throwing the whole appliance away.
Oven/Range Control Board -...
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Forum: Troubleshooting Game Consoles & Other Weird Devices
05-19-2022, 06:54 PM
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Replies: 4
Views: 138
Re: Jenn Air Wall Oven Dim LCD
OP you seem to have a wrong model number, it should be JJW2730 for 30" wall oven. It's like a space ship, lots of electronics.
A dim fluorescent VFD display on older oven control boards is usually...
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Forum: Troubleshooting Game Consoles & Other Weird Devices
05-19-2022, 02:36 PM
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Replies: 3
Views: 99
Re: Thermador Oven Controler Dim display
OP, can you switch off power and try using a small mirror? Also, measure the diameter of them. They come in standard sizes like 8, 10, 12.5mm etc.
edit: also a cellphone camera pic can work, just...
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Forum: General Capacitor Questions & Issues
05-17-2022, 01:32 PM
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Replies: 7
Views: 130
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Forum: Troubleshooting Game Consoles & Other Weird Devices
05-14-2022, 01:08 PM
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Replies: 28
Views: 1,715
Re: Agilent U1253B OLED display failed
That's great, using an MCU as a protocol translator to keep new displays compatible and stick it to Keysight. He totally redesigned the power section.
I think the first board fits U1273A. OLED TV's...
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Forum: General Electronics Technical Discussion
05-13-2022, 05:45 AM
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Replies: 39
Views: 1,114
Re: TIP120 Question
IRF620 (https://www.vishay.com/docs/91027/irf620.pdf) switches in nanoseconds, not microseconds. FAST.
I've tried building SMPS using Darlingtons and it was basically terrible to get past even 30kHz...
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Forum: General Electronics Technical Discussion
05-12-2022, 09:03 PM
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Replies: 35
Views: 532
Re: Line filter question
I checked the safety standards and basic insulation hi-pot test is about 1,500VAC for 1 minute.
Double-insulated 3,000VAC, they just doubled the test voltage for ungrounded equipment.
This...
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Forum: General Electronics Technical Discussion
05-12-2022, 12:00 PM
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Replies: 39
Views: 1,114
Re: TIP120 Question
TIP120 switching times are about 0.5usec on and ~3usec off with a -ve voltage drive to force it off faster. If you're not doing that or saturating it, it's much slower I would say up to 10usec to...
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Forum: General Electronics Technical Discussion
05-12-2022, 11:34 AM
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Replies: 35
Views: 532
Re: Line filter question
The power supply you built I thought is a linear one with a big power transformer, so it possibly has low leakage current and can be run with no ground if you're confident about the wiring and...
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Forum: General Electronics Technical Discussion
05-11-2022, 01:42 PM
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Replies: 35
Views: 532
Re: Line filter question
Those LED CC sources are setup to regulate above 16V, I guess they wanted the LEDs dim below that.
OP is connecting outlet PE with Neutral which is really not a good way to go. Because it's...
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Forum: Troubleshooting Power Supplies and Power Supply Design
05-10-2022, 07:58 PM
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Replies: 17
Views: 425
Re: Miele cat and dog hs05 vacuum power supply
I missed it - what was wrong with the Miele vacuum cleaner speed control board? The schematic is nice work.
R1 is across triac gate-MT1 and just keeps it off, lowers its sensitivity with high dV/dt....
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Forum: General Electronics Technical Discussion
05-10-2022, 07:53 PM
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Replies: 35
Views: 532
Re: Line filter question
It ran too hot, SOT-23 transistor dissipates 0.25W at 2mA/240VAC and 1/2 wave.
Almost all of these outlet/socket testers are just lamps in a delta configuration. Although the Fluke has a PIC MCU.
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Forum: General Electronics Technical Discussion
05-10-2022, 03:25 PM
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Replies: 35
Views: 532
Re: Line filter question
Neons are fine, I have one tester like that but they need at least 60-75V to light up.
That's too much for a lamp to earth-ground, you could have 50V and nothin' lit (w/120VAC mains here).
Modern...
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Forum: General Electronics Technical Discussion
05-10-2022, 01:45 PM
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Replies: 35
Views: 532
Re: Line filter question
240VAC Outlet tester (http://www.marcspages.co.uk/pq/4511.htm) using three neon lamps. I'd have to think how to make an LED version, and just leave it plugged in all the time.
For my workbench I use...
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Forum: General Electronics Technical Discussion
05-09-2022, 03:50 PM
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Replies: 35
Views: 532
Re: Line filter question
I think it's a problem if a group of outlets are grounded together but end up hazardous live because there is no ground in the first place and Y-caps or worse are providing leakage currents. If...
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Forum: General Electronics Technical Discussion
05-09-2022, 11:24 AM
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Replies: 35
Views: 532
Re: Line filter question
I thought OP has an older building without extensive plastic plumbing/heating.
What I do is measure ACV between Neutral and what might be ground (using long wires with the multimeter) and if it's...
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Forum: General Capacitor Questions & Issues
05-09-2022, 11:13 AM
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Replies: 2
Views: 144
Re: Tumble Dryer - motor start capacitor
I would say the new cap is fine.
CBB65 is a chinese oil-filled motor run cap, metal can with polypropylene film. They are large, designed for high ripple current heating when used as a run cap. They...
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Forum: Troubleshooting Audio Equipment
05-08-2022, 07:16 PM
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Replies: 3
Views: 158
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Forum: General Electronics Technical Discussion
05-08-2022, 07:04 PM
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Replies: 28
Views: 551
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Forum: General Electronics Technical Discussion
05-08-2022, 02:24 PM
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Replies: 35
Views: 532
Re: Line filter question
Your lab is going to need a PE ground and why don't you find a water pipe and connect to it?
If your ground floats, you get a weak capacitive voltage divider (the two Y-caps) so it will be at...
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Forum: Troubleshooting Game Consoles & Other Weird Devices
05-06-2022, 12:44 PM
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Replies: 10
Views: 377
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Forum: General Electronics Technical Discussion
05-06-2022, 12:29 PM
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Replies: 39
Views: 1,114
Re: TIP120 Question
As I know, the E-B resistors are mainly to dissipate stored charge and thus speed up turn-off times. If you build a Darlington on the breadboard out of two transistors, they are super slow switching...
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