ડાયોડ એ એક સેમીકન્ડક્ટર ઉપકરણ છે, જે currentને માત્ર એક દિશામાં જ પસાર થવા દે છે.
1️⃣ Normal / Standard Diode (PN Junction Diode)
પરિભાષા: Basic diode, current only forward biased direction માં જાય છે
Structure: P-type અને N-type semiconductor
Symbol:
|>|
Use: Rectification (AC → DC), Basic circuits
2️⃣ Special Diodes
2.1 Zener Diode
પરિભાષા: Reverse biased માં stable voltage provide કરે છે
Use: Voltage regulation, voltage reference
Symbol:
---|<|---
Key Feature: Allows current in reverse direction if voltage exceeds Zener voltage
2.2 LED (Light Emitting Diode)
પરિભાષા: Forward biased current પર light emits કરે છે
Use: Indicator lights, displays, lighting
Symbol:
|>| → (arrow for light)
2.3 Schottky Diode
પરિભાષા: Low forward voltage drop (0.2–0.3V), fast switching
Use: High-speed circuits, power rectification
Symbol: Similar to normal diode with ‘S’ notation
2.4 Photodiode
પરિભાષા: Light sensitive diode, generates current when illuminated
Use: Light sensors, IR detection
Symbol:
|>| → (arrow towards diode = light)
2.5 Varactor / Varicap Diode
પરિભાષા: Reverse biased voltage પર capacitance change થાય છે
Use: Tuning circuits, RF circuits
Symbol:
---|<|--- (with capacitor notation)
2.6 Tunnel Diode
પરિભાષા: Very fast switching diode, negative resistance property
Use: Oscillator, microwave circuits
3️⃣ Summary Table
Type | Polarity | Special Feature | Use |
PN Junction | Forward | Basic diode | Rectification |
Zener | Reverse | Voltage regulation | Voltage stabilizer |
LED | Forward | Emits light | Indicators, displays |
Schottky | Forward | Low voltage drop, fast | Power rectification, switching |
Photodiode | Reverse/Forward | Light sensitive | Light detection, sensors |
Varactor | Reverse | Capacitance adjustable | Tuning, RF circuits |
Tunnel | Forward | Negative resistance | High-speed, oscillator |
�� ટિપ:
PN Junction diode – Basic rectification
Zener – Voltage regulation
LED – Visual indication
Photodiode – Light sensing
