Forum: General Computer & Tech Discussion
08-10-2022, 11:30 PM
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Replies: 3
Views: 131
Motherboard diagnostic LED states
I've identified no more than 16 possible states for indication of motherboard diagnostic states which can be indicated with only 4 single colour LEDs which is:
No power applied (all off)
...
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Forum: General Computer & Tech Discussion
07-13-2022, 09:05 PM
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Replies: 3
Views: 644
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Forum: General Computer & Tech Discussion
07-12-2022, 04:56 AM
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Replies: 3
Views: 644
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Forum: Troubleshooting TVs and Video Sources
07-10-2022, 09:48 PM
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Replies: 0
Views: 148
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Forum: General Computer & Tech Discussion
04-09-2022, 12:46 AM
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Replies: 6
Views: 697
TPM 2.0 is not always standard issue
A Gigabyte Z690 motherboard I have recently purchased had a connector for the TPM (Trusted Platform Module) but was not included as standard in the box even though Windows 11 (which requires it) has...
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Forum: General Capacitor Questions & Issues
11-15-2021, 12:28 AM
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Replies: 2
Views: 730
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Forum: Equipment Usage, Soldering, Techniques, and Reviews
09-04-2021, 04:03 AM
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Replies: 5
Views: 2,224
Re: Test equipment and 1PPS inputs
Although not a piece of test equipment (but a piece of digital communications equipment), a Tandberg MT5600 DVB-T modulator can have the internal reference oscillator disciplined by a 1PPS input.
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Forum: Troubleshooting Power Supplies and Power Supply Design
08-29-2021, 06:07 AM
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Replies: 0
Views: 510
HEP Group LBVC9BI UNI LED driver
This unit had approximately 50K running hours before it failed; upon opening, a bulging (and heat stressed) TK UTWHM series 450V 10uF unit caused the TOP278 IC to blow its top off.
Other...
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Forum: General Electronics Technical Discussion
07-14-2021, 10:09 PM
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Replies: 1
Views: 1,408
Non-standard use of HDMI connectors
Two examples of such I have seen were on the logic analyser (SBUS) connector on a Siglent SDS1104X-E and the analog AV input on an AVerMedia H727.
Do you know of any other examples?
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Forum: Troubleshooting Power Supplies and Power Supply Design
05-13-2021, 11:47 PM
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Replies: 3,195
Views: 1,079,633
Re: Power supply build quality pictorial. part 2
Cooler Master V1200 (80 Plus Platinum certified)
Main board:
330uF 420V x2 + 390uF 420V primary filter (all Nichicon GG)
330uF 16V x6 Nichicon FPCAP before all +12V output inductors with 1000uF...
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Forum: Troubleshooting TVs and Video Sources
05-11-2021, 12:38 AM
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Replies: 0
Views: 360
Pioneer VSX-932 picky with non-CEA video formats
When I was trying to route a HTPC through a Pioneer VSX-932 AV receiver via HDMI to a TV via HDMI (so that I can get surround sound from the HTPC which supports it), the AV receiver (which overlays...
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Forum: General Computer & Tech Discussion
01-18-2021, 09:27 PM
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Replies: 0
Views: 932
Laser printer firing rates
Some time ago, I came across the Integrated Circuit Systems June 1995 Data Book and found something interesting, which was the ICS1574 User Programmable Laser Engine Pixel Clock Generator which can...
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Forum: General Computer & Tech Discussion
01-05-2021, 06:40 PM
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Replies: 7
Views: 1,706
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Forum: Troubleshooting Power Supplies and Power Supply Design
01-02-2021, 06:36 PM
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Replies: 1
Views: 598
Mains inverter build quality pictorial
Calibre 240V/1000W Pure Sinewave Inverter (12V input)
On each of the output transformers at the primary side:
2x HRF3205 MOSFETs on each side of the centre tap
2200uF 16V x2
30A fuse x2
On...
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Forum: General Computer & Tech Discussion
12-31-2020, 06:15 PM
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Replies: 7
Views: 1,706
Psuedo-4K LCD panels
I have come across (and was burned by at least one) so called "4K" (claiming 3840 * 2160) LCD panels which have an actual resolution of Full HD (1920 * 1080) meaning that every second pixel in either...
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Forum: Troubleshooting Game Consoles & Other Weird Devices
12-07-2020, 12:19 AM
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Replies: 22
Views: 2,421
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Forum: General Electronics Technical Discussion
11-29-2020, 01:14 AM
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Replies: 3
Views: 1,000
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Forum: General Computer & Tech Discussion
11-16-2020, 07:26 PM
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Replies: 3
Views: 1,105
.dlna domain names
I did a search for the .dlna domain and discovered that it is not in current use, but I think such a domain should be able to be used on local DLNA servers with an easy to use name you enter into...
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Forum: Troubleshooting Power Supplies and Power Supply Design
11-07-2020, 06:48 PM
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Replies: 2
Views: 851
Mains inverters with 55 Hz output frequency
On a generic box for a mains inverter I purchased, it had check boxes for the usual 50/60 Hz with an additional check box for 55 Hz - why would that particular frequency be offered at all?
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Forum: Troubleshooting Power Supplies and Power Supply Design
11-02-2020, 11:23 PM
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Replies: 3
Views: 1,109
What do you repurpose server PSUs for?
So far, I have repurposed server PSUs (all hot swap) for the following:
Portable multi-purpose test set with dual channel variable PSU
Variable frequency/voltage electrically isolated pure...
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Forum: Troubleshooting Power Supplies and Power Supply Design
10-31-2020, 04:51 AM
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Replies: 0
Views: 720
MOSFET ratings for UPS inverter applications
I did some analysis of the ratings of the output MOSFETs in UPS inverters with a conventional output transformer (modified and pure sinewave, centre tapped and H bridge, 12V/24V/48V) and I have come...
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Forum: Equipment Usage, Soldering, Techniques, and Reviews
10-01-2020, 11:30 PM
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Replies: 17
Views: 2,360
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Forum: General Computer & Tech Discussion
08-30-2020, 12:50 AM
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Replies: 36
Views: 4,273
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