2 to 4 channel audio converter using TL071
This is 2 to 4 channel audio converter circuit using TL071, can be used on Car audio stereo systems that only have front speakers only a single page. The circuit will increase the number of speakers up to the other two to be connected to the back speakers pair. Amplifier …
Simple audio alarm with transistor
      The work of the circuit when press switch S1 will have the electric current flows through R1 go to pick the electric charge at C1 at a pin B of Q1 as a result, will have electricity pressure then until make Q1 work.       When Q1 work Q2, as a result …
Simple 555 Alarm sound circuit
This is Simple 555 Alarm sound circuit using  IC-555 timer, it is easy for beginner as buzzer sound. IC-555 is pulse generator high frequency to  transistor PNP for booster current up  and  output is 8-32 ohms speakers. How it works Operation of the circuit. When connecting to a power supply circuit IC1 …
Electronic siren circuit with two transistor
The siren circuit is what importance in various alarm. For example : the emergency alert, burglar alarm circuits, Fire alarm circuits, Timer , sensor controls, etc. If we have not these circuit, We will not able to recognize the functionality of the circuit,we set out. Operation of the circuit is …