7 PinDIN Socket

What’s the right amount? A large amount of solder is not needed, just enough to cover the pad and lead without any gaps (actually, only 270° is required by IPC J-STD-001). The measure for too much solder is whether or not you can see the outline of the lead in the solder. This is important because you need to be able to see whether the solder adhered or “clung” to the lead (indicating a true bond), and didn’t just freeze around it. This applies to all types of joints: tinning wires, soldering to connectors, surface mount components… the solder should never completely hide the underlying wires or leads.

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Disturbed joint (bad): If the component moves during solidification, the internal structure of the solder will have fractures, leading to a high resistance or unreliable electrical connection, as well as a fragile mechanical one. The solder also appears dull and grainy–typical signs of a “cold” joint that doesn’t actually bond with the underlying surfaces.

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3.5 mm7 pin to 1 4 cable

The adapter cable not only connects the audio, but also provides the 5V DC supply required by PC electret (condenser) microphones, sourced from the radio's microphone socket. Simply connect the 3.5mm microphone plug to the corresponding socket on the adapter. If you have a PTT hand or foot switch, connect it to the ¼" jack socket, or use VOX if you prefer. For headsets, just connect the headphones to your radio in the normal way. Wiring diagrams are included so you can use this adapter with almost any 2 pin or 3 pin electret microphone element which will work off a 5V DC supply.

In general, the goal is to make the joint as quickly as possible. Longer times can char and damage the board, lift pads, overheat components, burn off and polymerize flux (making it harder to remove), and finally lead to a more brittle joint. Solder doesn’t just freeze on a joint, tin in the solder dissolves and chemically reacts with copper in the connection to form a new bonding material, called an “intermetallic layer”. While this layer is what makes an excellent thermal and electrical bond, it is also extremely brittle; a doubling of its thickness reduces joint tensile strength by half (ref 1). Since this layer grows faster with higher temperatures, joints should be made using the coolest temperature and shortest soldering time possible. This layer is also why re-heating joints has been shown to weaken them. Having said all this, I have to admit that I don’t know just how long is too long for projects that don’t need to operate for 30 years with 100% reliability. After 10 seconds there’s a good chance the flux has been used up.

For larger joints, rather than dumping in all the solder quickly, continuously pulse in small amounts to keep a fresh supply of active flux available.

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The store is now mostly empty, but we’ve kept the product pages and guides up since they have useful information. Many of our guides and videos still rank on the first page of google searches and have been seen millions of times. Content on this site and the CuriousInventor YouTube channel produced by Scott Driscoll.

7 pinDIN plug wiring diagram

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For use with microphones & headsets designed to connect to a PC sound card microphone input and fitted with a 3.5mm stereo (TRS) jack plug.

Wetting is how easily and quickly solder spreads out over a surface. A water droplet on a freshly waxed car shows poor wetting, as does solder on a heavily oxidized soldering iron tip. It basically comes down to how attracted the liquid molecules are to each other verses the surface (see surface tension). In industry, tests are done to determine the “solderability” of materials by measuring the time it takes solder to spread out over a surface, or measuring how much force a pot of liquid solder will pull down on a component partially submerged.

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7 PinDIN Connector Female

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A brochure for a solderabiliy testing station. Scroll down a few pages to see some great pictures of this machine holding one lead of a surface mount chip in a drop of solder.

Good pictures and description of wetting and surface tension. Contains a video of a razor blade floating on the surface of water until a drop of soap is added.

CuriousInventor launched in late 2006 (pre-arduino era!) as a place to enable hobbyists, students, and musicians to create their own technology. We sold open-source kits and tools, and offered numerous guides & videos on things like soldering, metal working, screws, electronics, and more.