FM Tuning Indicator Circuit

Here is an add on circuit to your FM radio for precise tuning of stations. Usually an LED indicator is provided in FM radio to see whether the station is tuned or not. But it is difficult to see the precise tuning points since the variation in the LED brightness cannot be detected easily. This circuit solves the problem.
Circuit diagram :

Precise  FM Tuning Indicator Circuit Diagram

The circuit uses the Op Amp IC CA3140 as a differential amplifier to sense the voltage level between the terminals of the tuning LED. The output of IC1 drives two LEDs one Red and one Green to indicate whether the station is precisely tuned or not. If both LEDs remain off, it indicates precise tuning. If anyone LED is on, it indicates that tuning is not precise. If both LEDs remain on, it indicates that there is no signal.
First tune the FM receiver in a station having strong signal. The tuning LED will light brilliantly. Then connect point A and B to the soldering points of the tuning LED observing polarity. Adjust VR till both the Red and Green LEDs turn off. Slowly change the tuning knob position. Any one LED will light up. So the circuit is working. Now glue the wiper of VR using adhesive to prevent its position change. Disconnect the tuning LED from the board. Now the circuit is ready to use. Power for the circuit can be obtained from the power supply of FM radio.

2012 Senner Tuning Audi S5 Coupe

The Senner Tuning, has released their new program for the new Audi S5, adding a highly appreciated tuning program for Audi’s resident sports coupe.

SENNER Tuning AG set a task to give the Facelift-S5 a wilder temperament. Better performance including the lifting of throttling of the maximal speed and also the installation of a power converter and performance sport air filters enable the engine to work at 277 kW 377 hp and 500 Nm torque, which emissions come out through stainless steel sport car exhaust system with 100-mm race-looking end pipes.

The exterior program for the S5 Coupe is far from finished and Senner Tuning has said that they’re working on new carbon fiber parts as part of their aerodynamic kit. front and back part of the car body tuned with new front and back lights and also LED lights to make the signs noticeable in the dark. The middle disks and 8,5×20 inch outwardly pushed wheel-tyres combination from the series of Corniche Challenge wheels (with the red Undercut Trim) and Vredestein Wintrac Extreme 245/30R2090W winter set of tyres (speed index W = up to 270 km/h) support the Variant 3 Inox Line-KW coilovers with an individually adjustable height, rebound and pressure level.

Original price of the vehicle including optional equipment and tuning amounts to € 79.900. The tuning measures alone 12.900 €.