The light activated switch circuit works on a very basic principle, that of amplification of the current produced by a photo-transistor when light impinges upon it. The current is amplified […]
Simplest Homemade Electric Guitar
Do you wish to convert your own Hawaian guitar into a simple electronic guitar ?Well here’s an excellent idea for you. It will cost you about $1 only. , You […]
Simplest Water Level Controller Circuit with Buzzer
This simple and inexpensive circuit sounds an alarm Ca whistle) when water level in a Container, such as an over- head water-tank, reaches a predetermined level. The basic circuit is […]
How to Calculate Timer Circuits using CMOS Gates
There are many occasions when a switching delay is required. One way of achieving this is to use an RC network and an inverter (see figure 1). This is quite […]
100 watt Inverter Circuit Using 2N3055 Transistors
This is a portable 100 watt inverter circuit and is intended for use with a 12 V lead- acid battery. Whether it’s in the car, boat, caravan or mobile home, […]
Keyboard Beep Circuit
There are many situations where an audible indication for a button pressed would be very useful. Two particular cases are: a morse key, where it is otherwise impossible to know […]