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Don't buy those $10 PSU "specials". They fail, and they have taken whole computers with them.
My computer doubles as a space heater.
Permanently Retired Systems:
RIP Advantech UNO-3072LA (2008-2021) - Decommissioned and taken out of service permanently due to lack of software support for it. Not very likely to ever be recommissioned again.
Asus Q550LF (Old main laptop, 2014-2022) - Decommissioned and stripped due to a myriad of problems, the main battery bloating being the final nail in the coffin.
Kooky and Kool Systems
- 1996 Power Macintosh 7200/120 + PC Compatibility Card - Under Restoration
- 1993 Gateway 2000 80486DX/50 - Fully Operational/WIP
- 2004 Athlon 64 Retro Gaming System - Indefinitely Parked
- Main Workstation - Fully operational!
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Re: HIFONICS ZXi 1008 car amp has output on one channel only
check rectifiers out of circuit they are not shorted and show the correct voltage drop of about .406 V DC. I am under the assumption that this is the correct voltage drop for these?
These rectifiers are HERF1004G and HERF1004GA. However I can't find a replacement for them. Here is the datasheet that I have on them.Computer and Small electronics troubleshooting and repairComment
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Re: HIFONICS ZXi 1008 car amp has output on one channel only
Tested the rectifiers, with the center legs out of circuit, and I get +45vdc and -45vdc out of them so I guess that means that the rectifiers are good and so the power supply FET's are good. When I hook the center legs up to the circuit that is when it goes into protect.Computer and Small electronics troubleshooting and repairComment
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Re: HIFONICS ZXi 1008 car amp has output on one channel only
Check everything downstream of the 2 center pins.Don't buy those $10 PSU "specials". They fail, and they have taken whole computers with them.
My computer doubles as a space heater.
Permanently Retired Systems:
RIP Advantech UNO-3072LA (2008-2021) - Decommissioned and taken out of service permanently due to lack of software support for it. Not very likely to ever be recommissioned again.
Asus Q550LF (Old main laptop, 2014-2022) - Decommissioned and stripped due to a myriad of problems, the main battery bloating being the final nail in the coffin.
Kooky and Kool Systems
- 1996 Power Macintosh 7200/120 + PC Compatibility Card - Under Restoration
- 1993 Gateway 2000 80486DX/50 - Fully Operational/WIP
- 2004 Athlon 64 Retro Gaming System - Indefinitely Parked
- Main Workstation - Fully operational!
sigpicComment
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Re: HIFONICS ZXi 1008 car amp has output on one channel only
I got a question regarding the designation of pin 1 on the circuit board. Is it usually a square shaped pad and the other are round or is that not standard?Computer and Small electronics troubleshooting and repairComment
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Re: HIFONICS ZXi 1008 car amp has output on one channel only
I don't know. Maybe those are + and - terminals. Photo please? Thanks.
Don't buy those $10 PSU "specials". They fail, and they have taken whole computers with them.
My computer doubles as a space heater.
Permanently Retired Systems:
RIP Advantech UNO-3072LA (2008-2021) - Decommissioned and taken out of service permanently due to lack of software support for it. Not very likely to ever be recommissioned again.
Asus Q550LF (Old main laptop, 2014-2022) - Decommissioned and stripped due to a myriad of problems, the main battery bloating being the final nail in the coffin.
Kooky and Kool Systems
- 1996 Power Macintosh 7200/120 + PC Compatibility Card - Under Restoration
- 1993 Gateway 2000 80486DX/50 - Fully Operational/WIP
- 2004 Athlon 64 Retro Gaming System - Indefinitely Parked
- Main Workstation - Fully operational!
sigpicComment
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Re: HIFONICS ZXi 1008 car amp has output on one channel only
since this amp has two transformers one for each channel I have pulled all of the rectifiers and mosfets out of the one channel and all of the ouputs and driver transistors are out as well on both channels however it is still going into protect. Do I need to pull the transformer on the channel that all of the ouputs are not installed in to see if it will come out of protect, in effect having only one channel operational?Computer and Small electronics troubleshooting and repairComment
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Re: HIFONICS ZXi 1008 car amp has output on one channel only
Found a DC offset on one of the speaker terminals how can I fix that? Goes from 1vdc to 3vdc before the protect circuit kicks in.
Thanks
TomComputer and Small electronics troubleshooting and repairComment
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Re: HIFONICS ZXi 1008 car amp has output on one channel only
The op amps tested OK, and I have found the reason for the offset and fixed it. The problem that I am having now has to do with the audio signal going from the op amps outputs into the current voltage gain stage. I don't understand where the signal is entering that stage. If anyone could help me with that it would be greatly appreciated.
Thanks
TomComputer and Small electronics troubleshooting and repairComment
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Good morning everyone,
I'm trying to repair an onkyo ht-r390 that has no sound output, despite the volume being at maximum, the rest seems to work; the video output signal (coming from an hdmi input) is present, but the audio is absent. Similar situation if I send an audio signal from any input I have no output.
The firmware reported is the following:
M:1.00/11107BLP
D:?.??/????????
O:1.00/11107AL
The DSP firmware given the question marks seems corrupt.
On the BCHDM-0678 - 25140678 - QPWBCHDM0678A0 board the chip that usually seems...05-11-2025, 02:59 AM -
Anyone run memory speed tests with an old X58-based triple channel 1st gen or any other >2 channel board? The one I have is a Gigabyte I think.
Anyway I had four 4GB DDR3-1333 modules in the 6 memory slots and got around 11GB/sec memory speeds assuming that it went dual channel since it didn't have enough modules for triple channel. Now I stuck in two more 4GB modules, but they are DDR3-1600. I'm still getting 11GB/sec speeds according to memtest86...
Just wondering, anyone do memory speed analysis on these triple (and higher) channel memory boards? Are there any... -
Hi friends
I have reverse engineered this tester, schematic is attached and is complete except for capacitor values. These testers annoyingly have no model number but they are the ones you find on the first page of just about any website if you type in "18650 4-channel tester". There is also a 2-channel variant and a newer 8-channel variant. They are very cheap (about £15) and can measure voltage, current, internal resistance and capacity. They have a multicolour display for all these statistics. They also have terminal blocks so that if you want to use a breakout board... -
HI,
i have a S4 MK1 and suddenly don't have signal at the right channel main output, both in rcd and trs outputs.
One day I was plugging all the set ( Macbook air+ traktor kontrol) and when I play the first song, right channel was silent.
i made all the silly checklist (SW mapping, connectors, swapping channels...etc)
and I concluded that is a hardware issue.
As both physical outputs are affected, I suppose it's something at the mainboard BEFORE the split. No item seems to be burned, or broken, at sightsee.
Does...05-11-2023, 05:58 AM -
I have bought this Zener Diode for this project what size and wattage resistor value do I need to use to get near 50 watt output
I bought this from an eBay seller but unfortunately they only had one
I bought three from Vetco Electronics these are Sylvania ECG5185A 9.1@10w A to Stud what size and watt resistor do I need to use to get near 10 watt output
I bought three of from them to also make battery packs with this output power limit in mind
I want to use this battery pack and turn it into a 9.1 output battery pack output to eliminate using 9 volt battery...
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