Latest threads in Electronics Repairshow only best voted threads
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Diode symbol confusion
on one schematic If a straight bar of cathode and triangle represent a signal diode Same with a small return towards the triangle from the bar represents a zener diode What does the symbol mean with 2...
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13 years ago
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PowerWare 9110 UPS schematic??
I have this UPS that had dead batteries, so I put in fresh new one's all charged up. I plugged it in and red ALARM led lights up, the fan turns on and batteries are being charged up, but it will not...
8
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13 years ago
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Valve/tube, A/R fault
Well that is what Avo calls it, I've never come across one before. ECC83 with curious cyclic swirling breaking-surf whitish-noise and clicks. Putting on Avo 160 tester showed short in A/R setting,...
5
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13 years ago
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60/40 vs. 63/37 Solder
Why are there these two very similar solders? Is there any situation where one is better than the other? I understand the eutectic nature of 63/37, and I wonder if/when 60/40 might ever be better to...
74
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13 years ago
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74 | |
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Telephone wiring 101.
I moved into a new house and have new voip phone service via the local cable company. The way it's configured is the cable from outside goes into the modem, model number Arris TM502G, then the output...
6
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13 years ago
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Is it just me or...
So there you are, working on something that you don't have any schematics for; (in this case a Datron 1281 8.5 digit DMM) This one wouldn't power up. Poking around I noticed some (TTL) circuits were...
8
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13 years ago
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Spectrian Amplifier
I have a Spectrian 30Watt 13cms power amplifier that only gives out 6Watts. Has anyone any service information or access to spare parts for this unit? Regards John.
5
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13 years ago
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OpAmp in ZyXEL Wireless Access Point POE
Hi all. The Power-Over-Ethernet (POE) injector for a ZyXEL wireless network link has just failed. New, or replacement, POEs are not easy to locate nor is information on these devices. There is not any...
3
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13 years ago
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OT: Southampton, Hampshire, UK a talk on PbF this evening
I'm giving a powerpoint presentation this evening, if anyone is around here, part of the national movement More details of venue etc on A 21st century plague - some reasons for failures/problems in...
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13 years ago
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Backiline 600
Seems to be a notorious problem with fan system on these, so many I cannot find a recognised solution in amongst the complaints. I've not taken apart yet,all wrapped up under the h/s, is it active or...
9
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13 years ago
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audio attenuator headphone to line
I want to make a simple audio attenuator by soldering a couple of resistors into a cable, similar to here: page talks about attenuating speaker level down to line level with 10k and 1k but I want to...
10
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13 years ago
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1394 Connectors
Hello all... I recently came across an old Orange Micro combination USB 2.0 and 1394A ("Firewire 400") PCI expansion card. The outboard 1394 connectors were heavily corroded and have so far proven...
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13 years ago
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PLEASE HELP!
I HAVE STARTED A FREE REFERRAL PROGRAM THAT WILL ACTUALLY MAKE YOU MONEY FOR FILLING OUT FREE SURVEYS. SOME OF THESE SURVEYS PAY 25 DOLLARS FOR A 10 MINUTE SURVEY. THE MORE OF YOU THAT SIGN UP THE...
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13 years ago
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Crest Audio Pulse 2 1100 power amps, 1999
Owner has 5 of these and 3 have gone into protect mode, all the same symptoms. All look the same but not sequential serial numbers. He's getting someone technical to look at the speakers and leads and...
4
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13 years ago
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CRT: Brief contrast/brightness prob at start-up.
32" RCA Entertainment Series CRT. Had popping noise w/ no pic or sound. Replaced HOT and FBT. Now A-OK except: At start-up, every start- up, contrast/brightness is way low/very dark picture. After 3-5...
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13 years ago
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