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...

This low-power UHF FM transmitter is intended for remote control applications such as garage doors and wireless alarm systems . It is a si...

      In this article we learn about a 1 Watt FM Transmitter amplifier with a reasonably balanced design specified to boost a RF frequency...

The post explains a 10 km long range transmitter circuit using ordinary components .PCB fabrication also explained. With the increased ac...

Warning: Take care with transmitter circuits. It is illegal in most countries to operate radio transmitters without a license. Altho...

      This is the schematic for an FM transmitter with 3 to 3.5 W output power that can be used between 90 and 110 MHz. Although the stabi...

DESCRIPTION Contains information about building a small radio transmitter, which has a PCB 1.75" x 2.5" (45mm x 68 mm) and has...