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  1. S

    Info for 2N3904 and 2N3906

    The term I've always heard for devices like this is that they are 'complementary' The NPN version of this transistor is the complementary PNP device. There are a lot of similar complementary devices used in electronics. As dorke points-out, you would use the NPN transistor in one application, or...
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    Identify diodes

    Did you, as suggested by davenn, Google the model of your Pioneer to see if you can find a schematic? (I'm assuming that Toko is internal to the Pioneer(?) It might be helpful since I also assume you're just checking the diodes to see if they're bad or if you have another problem elsewhere. My...
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    Fresh meat checking in

    Just checking. It was job-security for the rubber-hammer wielding employee. I thought maybe the job might become a new service industry job-description. 'Professional relay whacker'
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    Fresh meat checking in

    Took a tour of a potato chip factory long time ago. One room was full of mechanical relays to keep the factory production lines running. One guy sat in there with a rubber hammer. His job was to whack errant mechanical relays to un-stick them when they hung-up. The tour guide praised the...
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    How could I wire a reverb tank into an existing bass amp ?

    Sounds like you've tried Googleing this. Did you try re-wording your query? I sometimes have to reword my Google searches several times to hit on the key words that Google connects their information to. I find it hard to believe that somebody, somewhere, hasn't posted information about what...
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    Comedy Thread

    Been at this place 16 years now. Since day one there was a Planter's brand label taped to the portal over the shop doorway. We've been through 3 supervisors since I've been here. None of them noticed, or maybe they thought it was accurate. The label says, 'Mixed Nuts'.
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    How could I wire a reverb tank into an existing bass amp ?

    Did you try Googleing circuits for this? It might be a quick way to see what's out there is use right now.
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    Samsung TV Boards

    You need to follow the trace on the board, which is a lot easier with a schematic. The most common devices to fail dead-short are the power semiconductors.
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    Successful monitor repair

    Heck, these days most consumers can't find anybody who'll repair their broken electronics at a reasonable price. I pick-up trashed gear, fix it, and then can't resell it cause it's not the newest, best-est upgraded one on the market. My house is full of CRT TV's that nobody wants anymore...
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    Successful monitor repair

    Sad? People too lazy to try to repair their equipment is where I got my best stuff! Heave-ho, all you people with too much money to burn and no incentive to repair what you have.
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    Samsung TV Boards

    I haven't found the schematic either, maybe someone else here will. During this wait-time, it wouldn't hurt to replace your two suspect capacitors. No one mans this site 24/7, it's hit and miss when someone with helpful input will log-in and see what they can help with. I know it's aggravating...
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    measuring the sound intensity of Ultrasonic Pest Repellent

    I don't know how to do this without some specialized equipment designed to do it. I built a few of these years ago for my own use, maybe you're designing one for commercial sale? The most important factor in the ones I built was finding the piezo 'speakers' capable of reproducing the desired...
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    Two fluorescent tubes turned off at the same time - likely cause?

    When the bulbs are going bad, they are affected by the heating of the tube contacts when in use. Your fixture seems a little on the fancy side, I'm wondering if you have some particular control circuitry in there that might be experiencing a problem. Are you sure the bulbs themselves are seated...
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    DIY Resistance Box

    If you go with a decade box, it would help you to try to use low tolerance ( 1 or 2%) resistors, and at a wattage rating appropriate for the types of circuits you expect to use it in. I don't know what you expect to use this for, but a potentiometer will require monitoring to know when you reach...
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    Samsung TV Boards

    Your previously received input on capacitor testing is true to a point, especially on electrolytic capacitors, but you can't always see that on other types. The phenomenon occurs because the capacitor is charging itself from the small current used by your voltmeter to read the resistance across...
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    Two fluorescent tubes turned off at the same time - likely cause?

    I don't know your control circuitry in this unit, but my experience with dual lamped flourescent lamps is that when one goes, you can just replace it without the requirement to replace both lamps.
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    Apple vs the FBI

    I, frankly, do not believe the FBI does not have or cannot get the resources to do what they want done here. My opinion is, that this is a test case for any future attempt the FBI wants to make, setting a legal precedent for having done it. I'm just reading between the lines of what I think is...
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    Soldering iron trouble.

    Well, if the advice above doesn't work, I'd replace the iron in its entirety.
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    Super Bowl

    Those team members whom *steve* said seemed to have 'padded' chests. I figured I had to point this out, as there are a lot of engineers on this site, and specifics matter to them.
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    Soldering iron trouble.

    Again, good advice from Tha fios agaibh. I'd still re-tin the tip, but that's me. It should be bright and shiny. Make sure your tip is fully seated and tightened-down as Tha Fios Agaibh suggested. Is this a variable temperature iron, or just one temperature? Heating elements are either good or...
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