Telephone busy indication circuit
Source: InternetPublisher:红水杯 Keywords: LED BSP Updated: 2020/03/11
Telephone busy indication circuit
Component BOM table:
R1 3.3K 1/4W Resistor
R2 33K 1/4W Resistor
R3 56K 1/4W Resistor
R4 22K 1/4W Resistor
R5 4.7K 1/4W Resistor
Q1, Q2 2N3392 NPN Transistor
BR1 1.5 Amp 250 PIV Bridge Rectifier
LED 1 Red LED
LED2 Green LED
MISC Wire, Case, Phone Cord
Latest Power Circuits Circuits
- Using Lead-acid Battery as Power Source for Walkman
- Step-down power supply for driving relays
- LED Driver ZD1680
- Detailed explanation of 5v charger circuit diagram
- Car power 1.5V-12V six-speed converter
- 0.7～24V continuously adjustable current limiting power supply
- Reconstruction of the tube pre-stage by using low voltage difference power supply
- A low-cost, high-reliability battery charger for electric vehicles
- Battery powered switching circuit diagram
- Simple battery charging protection circuit
Popular Circuits
- Electronic thermometer circuit
- Pulse therapy circuit
- Chicken supplementary light to increase egg production rate circuit
- Rural vegetable greenhouse lighting circuit
- Poultry warming temperature control circuit
- Double detuned loop frequency discriminator circuit
- Diode square rate detection circuit
- Common emitter-common base wideband amplifier circuit composed of F733 integrated amplifier
- Differential Amplifier Circuit
- Fault signal trip circuit
京公网安备 11010802033920号