The article mainly introduces the various components needed by the hash board and their functions on the hash board.
Function: current limiting, partial pressure
Unit: Ohm (ohm or Ω)
Law: The equivalent composite resistance value obtained after the resistors are connected in series is R=R1+R2;
The equivalent composite resistance value obtained after the resistors are connected in parallel is R=R1R2/(R1+R2);
Network resistor: Series network resistor RN, 8pinA type butt type;
Parallel network Resistor RP, 10pinB network type.
Function: filtering, coupling, blocking DC and passing AC
Unit: Farah F
Law: The equivalent composite capacitance value obtained after the capacitors are connected in series is C=C1C2/(C1+C2);
The equivalent composite capacitance value obtained after the capacitors are connected in parallel is C=C1+C2;
Discharge capacity: CP
Polar capacitors: tantalum capacitors, aluminum capacitors.
Features: blocking AC, passing DC
Function: filtering, energy storage
Unit: Henry H
Formula: Inductive reactance XL=2πf L
Function: rectification, step-down, voltage stabilization, switching, detection, variable capacitance.
Features: unidirectional conductivity.
Type: The forward voltage of silicon diode is 0.6V～0.7V;
The forward voltage of the germanium diode is 0.2V～0.3V.
Polarity: One end of the colored band (or color ring) is negative.
Zener tube: DZ stabilizes the voltage and works in the reverse breakdown zone.
Light-emitting diode: LED, which emits light when the forward conduction is conducted.
Function: switch, zoom.
Amplification conditions: Transmitting junction is forward-biased, a collector is reverse-biased.
Classified by structure: NPN and PNP.
6. Field-effect tube
Features: Use electric field effect to control current.
Function: Switch, amplify, variable resistance.
Type: Junction FET
Insulated gate field effect tube MOS:
N-channel (depletion type and enhanced type)
P-channel (depletion type and enhanced type)
Principle: Use a small gate-source voltage to control a large drain current.
Conversion: 1Hz= 10-3KH = 10-6MH
Integrated Circuit: U