Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [replacement]

135 questions
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4 answers

Why do cordless tool batteries have a circuit board connected?

The other day I got tired of buying replacement 18 V battery packs for my power tools (drill, ripsaw, etc.) and I thought to myself, surely by this day and age the price of lithium-ion batteries can't be that high? I know people who have built a…
Alfred
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1 answer

Desoldering a through hole capacitor with weird terminals

Apologies in advance if this is the wrong place to post this question. So I've just RGB modded an old CRT TV, and now I'm trying to replace a series of capacitors to hopefully fix some screen geometry issues, and I've run into a little road block…
MyFingerHertz
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8
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2 answers

Disconnect vertical tab connector from PCB

I'm trying to replace a PCB, but I can't figure out how to unplug these connectors. They seem to be a "quick connect" style. I've tried tugging on them and wiggling them, but they won't come off. There's a little bump that fits into the hole on the…
Brian McCutchon
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8
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2 answers

Can I fix my monitor?

I have a monitor that is no longer working. It had an intermittent problem where it would go "pop", the black out for a little while, then come back on. Then recently it went "POP" a little louder, and hasn't been working since. I have looked at the…
Rasped
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7
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Fuse 125V/4A can be replaced with 250V/4A?

I want to replace a blowed fuse 125V/4A but it is rare to find them. Can I use instead a 250V/4A ? I read at https://www.mojotone.com/support/Knowledge-Base/Is-it-ok-to-replace-125v-glass-fuses-with-250v-glass-fuses-of-the-same-rating that Fuses…
Maverick
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3 answers

Replace BSS138 with AO3400A in level shifter circuit

I have to use level shifter circuit to interface MAX31855 with Arduino running on 5V. I found easy to build level shifter circuit at SparkFun website. It is using BSS138 (datasheet) which I don't have. I am thinking to build same circuit with…
Junaid
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6
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4 answers

Transistor: What is "epitaxial planar type"?

I need to replace a (panasonic) transistor and read the datasheet to possibly replace it with something else. However in the datasheet they call this transistor a "Silicon NPN Epitaxial Planar Type". What is "Epitaxial Planar Type", is this a…
Codebeat
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What's the right replacement for vintage "glass cloth insulation" that transfers heat in Variac?

I ripped apart a broken 1950s-era Variac autotransformer to diagnose an internal short in the core, and found a layer of gooey insulating fabric mat between the coil/taps and the mounting plate: The short seems to have been caused by some sort of…
BZo
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6
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2 answers

Replacing an old capacitor

I've managed to blow a capacitor while doing maintenance on my 1967 electric organ. It's a 80uf 25V. I've done some searching and found that I can replace it with one that has a higher voltage rating but the same farad value. Is there anything else…
Creeker
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4
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2 answers

How do I replace this bike light cache battery?

This Luxos U dynamo powered bike light has a cache battery that provides backup power for the light when the dynamo isn't providing power, and it also provides power to smooth the USB charging that it also supports. The nominal power output of the…
WPNoviceCoder
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4
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2 answers

3.5mm audio headphone jack

I have a broken headphone audio jack from an electronic keyboard. With the jack broken, the speaker audio no longer functions. The manufacturer no longer supplies the part as it has been discontinued, and they claim they manufacture all of their own…
Mark
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4
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2 answers

Replacing NiMH with Li ion

I have a rechargeable vacuum cleaner with NiMH batteries, 1800mAh and 14.4 volts, 12 cells. The charger is 18v 200mA. The batteries have now died. Can I replace the batteries with 4 cell Li-ion in series? That will be 14.4 volts, if considered 3.7v…
sina rahbari
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4
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1 answer

Looking for a suitable transistor for a simple circuit - 50 y/o Junghans clock repair

Trying to find if there is a suitable commonly available replacement transistor for a small circuit card on a Junghans W.707 clock movement (about 50 years old.) Here's a picture of the whole thing http://www.hwynen.de/jgh-atomat.html (top right…
Ian Stuart
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1 answer

Have cross reference books ceased to exist?

Back in the "good old times" when I had a device fail I could grab my trusty old transistor cross reference book and find a replacement part with the same footprint and comparable parameters in a very short time. I know that no one prints such books…
kruemi
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3
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2 answers

Is a 2N3906 an appropriate replacement for a BC158(B) in audio amp circuit?

On a long but educational process repairing a vintage German stereo. I have identified a failed (shorted) PNP transistor in the power amp section. (Schematic with highlight is below.) The part on the actual board is a BC158B; the schematic specifies…
BZo
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