To begin with, this Transistors Based Megaphone Circuit uses transistor like amplifier, as it take weak sound from MIC and makes loud sound in speaker. People also use it in public talks, sports events and rallies wherever they need a loud voice; the circuit additionally uses two TIP32 transistors in a push-pull configuration to boost […]
Transistor Circuits
Adjustable Thermostat Circuit using IC LM56
An electronic adjustable thermostat controls temperature in heating or cooling systems, as this adjustable thermostat circuit uses the low-power IC LM56 chip to switch between two temperature modes. First, it controls outside transistor for output load and then IC LM56 give reliable, precise temperature control. Moreover, it is good for many uses like check temperature […]
Simple LED Alert for Telephone Off-Hook Detection Circuit
This simple LED circuit detects voltage drops when we lift the handset, actively turning ON an LED to show that our telephone is in use. Also, circuit is good for old phones with no light alert and it is very useful for shared phones and stops call interruptions. Here, circuit runs on simple 3V battery […]
Electromagnetic Telephone Ringer Circuit
Electromagnetic Telephone Ringer Circuit helps us know when call comes and when there is no need connect to phone line. Also, this circuit is useful when there is no access or do not want to touch phone line, as it works by sensing electromagnetic field from ringing signal and then buzzer turns ON; furthermore, the […]
9V Battery Powered Transistor Intercom Circuit
Intercom system is device for talking at short distance; so a 9V Battery Powered Transistor Intercom Circuit uses 9V battery which is good for home or office talk. Also, it uses only transistors which is easy to understand and works well. Furthermore, the circuit has mic and small speaker as sound and a BC547 transistors […]
Transistor Based Battery Heater Circuit
Transistor Based Battery Heater Circuit uses 12V DC with good heat and very portable; also circuit is good for outdoor, no-electric place, small incubator and emergency heat. Furthermore, it uses astable multivibrator with transistors and this transistors switch power transistor and run heat coils and finally, LED show if circuit is working. Circuit Working: Parts […]