Description The power amplifier boosts 88-108MHZ 1-2W FM transmitter's power to 15 W. It includes multi-level low pass filter and ...

Description This one is a high power long range (use yagi antenna)  FM Transmitter  that provides very good frequency stability in about 1k...

The RF oscillator using the inverter N2 and 10.7Mhz ceramic filter is driving the parallel combination of N4 to N6 through N3. Since t...

     In the earlier post, we have studied about Simple fm radio jammer and its applications. Now, let us learn about one more interesting ...

This metal detector is a low sensitive type  can be powered by a battery 3 to 15V, and may be constructed employing four exclusive OR gat...

Low cost fire alarm circuit. Description. W hen there is a fire breakout in the room the temperature increases. This ...

                                                    B1=AC BUZZER

This is a simple circuit that can power a light bulb without any wires, at a distance of almost 1 inch! This circuit acts as both, step u...

There are some hopes that the sun will become a main source of energy in the 21st century. By then, sources of oil will be almost exhauste...

Flashing neon globes have use in many applications, however their relatively high working voltage precludes their general use where a ma...

The effect can be eliminated by means of Ri compensation, which essentially entails measuring the motor’s current consumption, relating t...

For a 3-phase induction motor,Lit is necessary that all the three phases of supply are present while it is on load. When any one of the ...

A lot of controversy exists among amateur fishermen as to the effectiveness of "fish-callers". Some swear by them, others just s...

The 60 Hz inverter shown below is about as simple to make and as inexpensive as one could desire. Yes, it is capable of providing some ve...

The receiver is intended primarily for use with the remote control UHF transmitter described in the preceding article. It is a super-regen...