LPG gas is supplied in pressurised steel cylinders. As this gas is heavier than air, when it leaks from a cylinder it flows along floor and tends to settle in low spots such as a basement. This can cause fire or suffocation if not dealt with. Zener diode ZD1 is used to convert 9V into… Read More »
USB Power Socket Project Assemble the circuit on a general purpose PCB and enclose in a slim plastic cabinet along with the indicator and USB socket. While wiring the USB outlet, ensure correct polarity of the supply. For interconnection between the cigar plug pin and the device, use a long coil cord.
Automatic Light Controller Circuit Project The circuit is simple and can be assembled on a small gene r a l -purpos e PCB. Use a heat-sink for IC1. Make sure that LDR1 and the light bulb are well separated. The circuit can be used for streetlights, tubelights or any other home electrical lighting system that… Read More »
Four Stage FM Transmitter Circuit Project This transmitter is meant only for educational purposes. Use of this transmitter with outdoor antenna is illegal in most parts of the world. The author and EFY will not be responsible for any misuse of this transmitter.
Long distance IR transmitter circuit document Here is a simple circuit that will give you a pretty long range. It uses three infrared transmitting LEDs (IR1 through IR3) in series to increase the radiated power. Further, to increase the directivity and so also the power density, you may assemble the IR LEDs inside the reflector… Read More »
Color detector scheme diagram When all of the LDRs get triggered or stay untriggered, you will observe white and black light indications respectively. Following factors might be carefully noted: Potensiometers VR1, VR2 and VR3 may possibly be applied to alter the sensitivity of the LDRs. Use good quality light filters. Common ends of the LDRs… Read More »
230V Lamp Flasher Circuit Project The circuit works off only 3 volts. Since current consumption is fairly low, two AA-type cells are sufficient to power the circuit. Assemble the circuit on a general-purpose PCB and enclose in a suitable plastic cabinet with integrated AA-size pen-light cell holder. Drill holes for mounting the “on”/”off” switch and… Read More »
The FX75 Stereo Flanger replaced the FX70 in DOD’s lineup in late 1984. Featuring a Width control and two output jacks, the FX75 was much more versatile than its predecessor, but the flanging effect it could provide was still not very intense. That said, chorus-like washes of flange can be easily dialed in, and the… Read More »
This guitar effect unit is great sounding octave fuzz, with an optional mode of just fuzz. The fuzz is really a absolutely rectified signal and is fairly chewy. For some the Fuzz alone could possibly not be loud enough, this could be fixed by raising the value of the 820 ohm resistor and lowering the… Read More »