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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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repairing an electret microphone
To replace a wire which broke in the swivel
of the boom, I reconstructed the boom of an Altec Lansing headset. This included resoldering the wires to the back of the electret capsule. The speakers still work but the mic does not after this repair. Found a similar failure after soldering a new electret onto the wires of an inexpensive Creative/Telex desktop mic. Is the electret mic particularly heat sensitive? If so, what technique is recommended? Already I was careful to apply minimal heating. Thanks, ... Peter Easthope |
#2
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repairing an electret microphone
In article , Peter wrote:
To replace a wire which broke in the swivel of the boom, I reconstructed the boom of an Altec Lansing headset. This included resoldering the wires to the back of the electret capsule. The speakers still work but the mic does not after this repair. Found a similar failure after soldering a new electret onto the wires of an inexpensive Creative/Telex desktop mic. Is the electret mic particularly heat sensitive? If so, what technique is recommended? Already I was careful to apply minimal heating. Thanks, ... Peter Easthope If your continuity is good, try another capsule. Try attaching small wires first with speed. The only thing that could go wrong is melting the flexible parts of the diaphram. |
#3
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repairing an electret microphone
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#4
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repairing an electret microphone
GregS wrote: Peter wrote: To replace a wire which broke in the swivel of the boom, I reconstructed the boom of an Altec Lansing headset. This included resoldering the wires to the back of the electret capsule. The speakers still work but the mic does not after this repair. Found a similar failure after soldering a new electret onto the wires of an inexpensive Creative/Telex desktop mic. Is the electret mic particularly heat sensitive? If so, what technique is recommended? Already I was careful to apply minimal heating. If your continuity is good, try another capsule. Try attaching small wires first with speed. The only thing that could go wrong is melting the flexible parts of the diaphram. It's a job that needs a lowish power or thermostatically controlled iron ( or a fast hand ! ). As someone else mentioned, the capsules are polarised. Graham |
#5
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repairing an electret microphone
Peter wrote:
To replace a wire which broke in the swivel of the boom, I reconstructed the boom of an Altec Lansing headset. This included resoldering the wires to the back of the electret capsule. The speakers still work but the mic does not after this repair. Found a similar failure after soldering a new electret onto the wires of an inexpensive Creative/Telex desktop mic. Is the electret mic particularly heat sensitive? If so, what technique is recommended? Already I was careful to apply minimal heating. My experience with soldering hundreds of Panasonic WM 55A103 electret capsules is that it takes quite a bit of abuse and clumsy soldering/desoldering before anything goes seriously wrong. You wouldn't normally expect to experience a problem from using ordinary soldering techniques. If the job looks as though it might turn into an awkward one and require a bit of messing-about, it may then be a good idea to provide some sort of heat sink on the capsule body. Where you might have got a problem, however, is if you have accidentally smeared a whisker of solder or dross from the live contact to the capsule body and cause a short-circuit. That can sometimes be difficult to spot unless you are really looking for it. It is best removed mechanically with a scriber point; if you try to unsolder it, the chilling effect of the casing on the solder blob will just create a worse and worse mess. -- ~ Adrian Tuddenham ~ (Remove the ".invalid"s and add ".co.uk" to reply) www.poppyrecords.co.uk |
#6
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repairing an electret microphone
On Apr 9, 3:35*am, Eeyore
wrote: GregS wrote: Is the electret mic particularly heat sensitive? If so, what technique is recommended? *Already I was careful to apply minimal heating. It's a job that needs a lowish power or thermostatically controlled iron ( or a fast hand ! ). If the job is heat sensitive, you want the iron HIGH power, up to temperature, and do the joint fast. A low power iron, especially if it's not thermostat controlled, is likely to take too long to get the joint up to temperature, and THAT cooks the nearby items. If a joint takes more than three seconds to heat and draw solder, your iron is too cold. If your iron stays on the joint for more than five seconds, the operator is too slow. If the work is or might be critical, I always use an artist's small paintbrush with water-washable flux to prepare it. And, I wash it afterward (small squirt from a poly bottle with distilled water). |
#7
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repairing an electret microphone
whit3rd wrote: Eeyore wrote: GregS wrote: Is the electret mic particularly heat sensitive? If so, what technique is recommended? Already I was careful to apply minimal heating. It's a job that needs a lowish power or thermostatically controlled iron ( or a fast hand ! ). If the job is heat sensitive, you want the iron HIGH power, up to temperature, and do the joint fast. Not given the size of these babies. They're minute. Graham |
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