For very short links two to three holes in length, it is possible to make solder bridges to connect them.
If you have an old high-wattage soldering iron like this with a burnt tip, then it will not work, and you will struggle. If you use anything higher, the solder may not stick and even worse, the copper pads will come off due to the excessive application of heat. In the Electronics Tools section of this site, you can see some of my vintage Antex soldering irons that I use. Omega: Rosin and Lead Free Solder, which uses a different flux ingredient and is ideal for asthmatics.
These prototyping boards are currently available from places such as eBay, Amazon, and many electronics shops.
This is a small board measuring slightly smaller than a credit card, but very useful if you have a theory on paper and you wish to verify it with a quick rough circuit. I placed some orders for these and they generally delivered within two weeks and came from China, occasionally the odd one does not get through but most of the time I have not had any problems, besides you always get your money back from PayPal if there is an issue.


These boards are simpler to use than strip-boards because there is no requirement to break connections, and therefore useful for beginners.
The correct soldering iron bit and temperature, as well as the correct solder are essential. The technique is to put some solder on the pads first, and then to join them thus creating a track. If you need to have a long connection then it is better to use a wire link on the component side. When I am designing a circuit, I tend to keep the connections to a minimum of two copper pads. You need to make sure that your solder is as thin as possible, and after soldering, you will need to check with a continuity meter to make sure that the adjacent lines are not touching. You need to have a 17 W pencil soldering iron and anything lower such as 15 W is even better. You will not be able to buy those as they are priceless but it will give you an idea of what to get.


With asthma on the rise, and most schoolchildren carrying inhalers it is probably better to get rosin free solder called Omega. It is great for building those little temporary projects for operational amplifier gain experiment or learning how to bias a transistor. There is a limit to how long the line can be, but generally, around five pads may join easily.
Wartons Metals, which is a UK manufacturer of solders, is the only company that I am aware of that makes this type of solder.



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