This post explains for the diode.
The Part Number is BB105.
The function of this semiconductor is 30V, Silicon Planar Signal Diode.
Manufacturer: Iskra Semic, TeleFunKen
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Description
A capacitance variation diode, also known as a varactor diode or varicap diode, is a type of diode that exhibits a variable capacitance with respect to the applied voltage. It is specifically designed to function as a voltage-controlled capacitor.
The capacitance of a varactor diode is inversely proportional to the voltage applied across its terminals. As the voltage increases, the depletion region width within the diode changes, resulting in a corresponding change in capacitance. The relationship between the capacitance and the applied voltage is typically specified in the diode’s datasheet.
Varactor diodes are commonly used in various applications, particularly in radio frequency (RF) and microwave circuits, for voltage-controlled oscillators (VCOs), tunable filters, frequency synthesizers, and voltage-controlled phase shifters.
BB105A : UHF Tuner up to 790 Mhz
BB105B : UHF Tuner up to 860 Mhz
BB105G : UHF Tuner in addition marked with green colour stroke
Applications:
1. Frequency tunning in TV receivers.
Other data sheets are available within the file: BB105A, BB105B, BB105G
BB105 PDF Datasheet
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