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Production and use
The circuit transistor adopts a silicon triode, B of BG1 and BG2 is less than 100, and B of BG3 and BG4 is less than 30. The capacitor requires a small leakage current, otherwise the timing will be shortened. The AN is a small button that can be self-made or replaced with a small switch. CZ1 doorbell button jack, CZ2 is the headphone jack.
Look for a 40*25 mm copper plate, print the board with a small knife as shown in Figure 12.8.2, and then solder the components directly to the copper side. The whole machine can be installed in the pocket radio
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