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This low-cost short-wave transmitter is tunable from 10 to 15 MHz with the help of ½ Jgang condenser VC1, which determines the carrier frequency of the transmitter in conjunction with inductor L1. The frequency trimming can be done with...
A bipolar junction transistor (BJT) has three regions, of which the emitter and the collector are made of the same type of semiconductor (‘n’ for npn and ‘p’ for pnp) but the base is of opposite type. If we...
Christmas just would not be Christmas if you do not put a flashing star on your Christmas tree. Here is the circuit of such a flashing star. Fig. 1 shows the circuit of the flashing X’mas star. At the heart...
You can take this white LED based night lamp on your picnic outings. The lamp has sound trigger and push-to-on facilities and gives ample light during a walk at night. It will also prove useful in locating the door...
If your car has an FM radio with stereo output but no inbuilt cassette player, this circuit will come handy for listening to your favourite collection of music from your personal audio player through the FM-stereo car radio. For the...
Here’s a low-cost circuit to convert 6V DC into 12V DC. It uses no transformer and is easy to construct with few components. The circuit is built around IC 555, which generates the required frequency of around 2 to 10...
FM transmissions can be received within a range of 40 km. If you are in fringe areas, you may get a very weak signal. FM DXing refers to hearing distant stations (1500 km or more) on the FM band...
Here is a simple non-contact AC power monitor for home appliances and laboratory equipment that should remain continuously switched-on. A fusefailure or power breakdown in the equipment going unnoticed may cause irreparable loss. The monitor sounds an alarm on...
Most optical interruption counters make use of a light bulb with light-dependent resistor (LDR) or ordinary phototransistor as the sensor. The interruption counter work satisfactorily in darkness only and cannot be used outdoors because of the chances of false...
If some intruder tries to open the door of your house, this circuit sounds an alarm to alert you against the attempted intrusion. The circuit (Fig. 1) uses readily available, low-cost components. For compactness, an alkaline 12V battery is used...