In this post we study a power amplifier design configured using an ordinary IC 741 and a couple of MOSFETs. An operational amplifier’s output power such as from an IC 741 can be typically enhanced when a complementary emitter follower transistor is coupled at its output. The same could also generally be accomplished using a […]
Newly Updated Circuit Projects:
FM Signal Booster Circuit with Adjustable Gain
Did you’ve ever had trouble catching or establishing connection with distant FM radio stations which were broadcasting programmes you wanted to listen to? Perhaps you’re aware there are a lot more faraway channels, further than the range of your FM receiver. Of course, you could purchase or construct a stronger FM tuner but, building a tunable FM […]
Ding Dong Bell Circuit that Saves Electricity
This circuit goes beyond being a simple two-tone doorbell. Instead, it utilizes envelope modulation to produce an authentic ‘ding-dong’ chime sound. Additionally, it incorporates a power-saving feature, consuming zero power in standby mode. Circuit Diagram How the Circuit Works When SW1 is pressed, it triggers Q1 to power the remaining circuitry. IC1a serves as a […]
Audio Source Selector Circuit
In this post I have explained a simple audio source selector circuit using a single push button and a couple of relays. The idea was requested by one of the avid readers of this blog Mr. Mike. Design Description The request can be seen as given below: I need a circuit diagram to add a […]
Extended Telephone Ring Amplifier/Repeater Circuit
The discussed phone repeater circuit can extend the range of your land line ring sound from the phone such that one is able to make a call heard in another room or even in another house. By: R.K. Singh Circuit Operation The circuit can be connected with an attached buzzer, the buzzer with a driving […]
2 Mosquito Swatter Bat Circuit Diagrams Explained
Mosquitoes are a big menace to humankind and these are present in every corner of the world. A cool way of avenging yourself could by eliminating these “devils” through electrocution. A mosquito swatter bat is designed just for this. I have explained how to build its electronic circuitry. The idea was requested by Mr. kathiravan d. […]