Page 41 - Build Your Own Transistor Radios a Hobbyists Guide to High-Performance and Low-Powered Radio Circuits
P. 41
Ant.
Ground
Ose.
FIGURE 3-5 Two gang variable capacitors for typical transistor radios.
The two trimmer capacitors for the variable capacitor in this figure are always
internally tied to each of the antenna section and the oscillator section.. Be careful
to note the labeling of each tab or lead for "Ant." and "Osc." because they are not
the same capacitance. If you look carefully, you can see that the oscillator section
tab of a two-section variable capacitor leads to fewer plates than the upper tab,
which is marked "Ant."
Figure 3-6 shows various air-dielectric variable capacitors, which in general are
available on the Web or via eBay.
