- Electronics Projects
- 1.5v to 220v AC simple inverter
- Build Simple AM Radio receiver at home
- Simple Uninterruptible Power Supply (UPS) Circuits
- Single Transistor Amplifier Circuit
- 3.7v Lithium Battery Level Indicator
- LED Chaser using transistors
- Electronics Projects for Beginners
- Simple Latch Circuit Using Transistors
- DC to AC Power Converter circuit feature working
- Fire Alarm Circuit using Transistor
- Two Transistor Amplifier
- Laser Security System
- Music Operating Dancing LEDs light
- Volts Booster Circuit Using Ferrite ore transformer
- Touch switch circuit using Transistor
- Two transistor FM transmitter project
- LED Flasher Using Timer IC 555
- DC Voltage Power Supply Using The LM317
- Electronic Mosquito Repellent Circuit
- Light Dimmer Circuit 1000 Watts Using BT139
- Non-Contact Voltage Detector by using transistor
- 4 volts simple inverter project: explanation
- Flashing Police Lights Circuit
- Light Dependent Resistor, its types and applications
- 100 watts inverter circuit working and applications
- Stereo Audio Amplifier 5W Circuit using TEA 2025 IC
- Small High Volts using 2Sc 1815 transistor
- Electronic Doorbell Circuit using a 555 and CD4017
- Touch On Touch Off Switch Circuit Using 555 timer
- LM386 Audio Amplifier Circuit
- IC 4440 Amplifier Circuit
- Neon Lamp Circuits Working and Application
- Low Power Audio Amplifier Using integrated circuit
- Voltage Regulator Circuits using Transistor and Zener Diode
- Water Level Indicator Circuit Using Transistor
- LED Chaser using CD4017 IC
- Motion Sensor Light Switch
- Melody Generator Using IC um66
- Water Level Indicator Using IC
- Led Light to 220v AC
- LiFi Data Transfer System, WiFi vs LiFi
- How to Connect a CAR Battery | Polarity Checker
- Voltage Level Indicator Circuit
- Security Alarm Using PIR Sensor
- Battery Level Indicator Using LM 3914
- Single Transistor FM Transmitter circuit
- Different types of Capacitor
- Light Emitting Diode (LED) Types of LEDs
- Different Types of Relays
- Piezo buzzer features equivalent
- Clap Switch : Circuit and Its Working
- Different Types of diode, working and features
- PC817 Optocoupler Pinout, Equivalent, Features and applications
Simple Latch Circuit Using Transistors
The latch is a logic circuit of electronics that has two stable states. A latch is a device similar to transistors. It has 3 terminals which function like a transistor base, collector, and emitter. In the transistor when current is fed to base the sufficient current flows from the emitter to the collector as long as the base is feeding but in the latch when the current is fed to the base current permanently starts flow from the collector to the emitter even if the current at the base is removed. So when we have to shut the circuit we have to disconnect the power supply of the latch. Latch circuit mostly is mostly used in alarm circuits. when we press the alarm button the sirens flash until we shut down the alarm.
Components Required Simple Latch Circuit Using Transistors
- Resistors- 10k (2), 100k (2), 220 ohms (1)
- Transistors- BC547, BC557
- Capacitor- 1uF
- Relay- 6v
- Diode- 1N4148
- LED
- Power Source- 5v-12v
- R1=R2=R4 = 10K
- R3 = 100K
- T1 = BC547
- T2 = BC556
- C1 = 1uF/25V
- D1 = 1N4007
- C1 = 1uF/25V
- Relay = According to the input supply
In this logic circuit, we are going to design a latch circuit using transistors. It consists of two transistors bc 547 NPN and BC557 PNP. We can easily explain it by using the circuit diagram given below. As shown in the above figure transistor T1 (bc547 npn) and T2 (bc557 PNP) are configured in such a way that BC557 follows BC547 to either start or stop the conduction depending upon the trigger received from T1 Side.
Related Circuits
- https://envirementalb.com/flip-flop-using-555/
- https://envirementalb.com/led-chaser-with-only-4017/
- https://envirementalb.com/d-flip-flop-circuit/
- https://envirementalb.com/bc547-transistor-pinout/
