My Light Diagram

This is a simple and useful circuit diagram of an FM transmitter is sown in this schematic . This FM Transmitter software is very simple and it has a acceptable transmission . The signal transited from this FM transmitter can be received at almost 300 meters in open air The circuit require a 3volts operating voltage and can be tuned anywhere in the FM band. 3V FM Transmitter Circuit Diagram You can use this emitter circuit to transmit signal from your house to garden or from room to room . To listen the signal you can use any radio (portable or not ) that can work on FM band . Connect a half or quarter wavelength antenna (length of wire) to the aerial point. At an FM frequency of 100 MHz these lengths are 150 cm and 75 cm respectively. The calibration of this FM emitter circuit is very simple and you need just to place a radio at some distance from the transmitter and set it somewhere about 88-107MHZ( chose the transmission frequency ) and after that vary the transmitter oscillator fre...

Battery Level Indicator 36 Volts Schematic Circuit Battery Level Indicator 36 Volts Schematic Circuit This battery level indicator offers (5) LEDs that light up progressively as the battery voltage increases. This is a update of the 24V Battery Level Indicator. While designed for 36V systems, it is easily modified to 24V, 48V or 60V simply by changing two resistors. LED Color Charge Level Red: Power Connected (0%) (essentially always on) Orange: Greater than 35V (25%) Yellow: Greater than 37V (50%) Green: Greater than 39V (75%) Blue: Greater than 41V (100%) (full charge is about 41 to 42V) Of course, you may select your own colors if desired. High voltage issues One limiting factor is the LM339 that has an absolute maximum voltage rating of 36V –and it is not good practice to operate near that point. The solution involves running the IC power rail off a zener shunt regulator. Shunt regulators are very simple, inexpensive and robust –good for this application. However, the LM339 ope...