— This is made to tune transistor radios, especially when you don't want any noise, when you want calm surroundings, you have to have a sinusoid. You need it on the speaker, since it creates the noise. And with this you can sit calmly and work. With a car radio or a homemade receiver, or one where the output amplifiers are broken. To insert the transistor, so that it works properly, without distortion, how much resistance do you need? You need a resistance of 10 ohms, the normal amount. Well, from 5 to 10 ohms depending on the power. Then we take the wire, nichrome, measure it out. How much do we need? Measure about 2 meters. And how do we get it in there? Well, I wound it into a spiral, soldered it, and it worked out ok. 10 ohms, 8 ohms...The main spiral, this here, has a resistance of 10 ohms. This 2 kilohms doesn't count. We only count the total resistance – 8 ohms.