Showing posts with label strength. Show all posts
Showing posts with label strength. Show all posts

Monday, October 20, 2014

TV Relative Signal Strength Meter

This circuit was designed to assist the installation of TV antennas. The signal is monitored using a small portable TV set and this circuit monitors the output of the TVs FM detector IC via a shielded lead. To initially calibrate the meter, adjust trimpot VR2 to zero the meter. Trimpot VR1 is a sensitivity control and can be set for a preset reading (ie, 0dB) or can be calibrated in millivolts. Rotating the antenna for a minimum reading on the meter (indicating FM quieting) gives the optimum orientation for the antenna.
Circuit diagram:
tv-relative-signal-strength-meter-circuit diagram1 TV Relative Signal Strength Meter Circuit Diagram

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Wednesday, September 10, 2014

Signal strength indicator on the 64 LEDs

I present to you a simple project indicator audio signal, a distinctive feature of this project from others is that in the scheme for each channel I primel 32 LEDs to get the long line. At the heart device - AVR microcontroller Atmel ATmega8535, ULN2803 - 8-channel key Darlington, moreover, operational amplifiers, his appointment think its also clear. Sensitivity indicator is adjusted by resistors R32 and R33, for each channel separately. This project is my thesis work I did a couple of years ago, when the scheme came across sharilsya in folders on your PC, and decided to send to the site.

The scheme is quite large, reduce LED designation did not, the scheme can be found below:

As for the LEDs, it is convenient to replace the special LED bars, besides, they will look better.


The entire device is going on a breadboard, PCB did not draw who liked the project can draw the circuit board and send it to the forum. All radio components in the circuit can be replaced by a similar, resistor and capacitor can be placed close to par. The transistors may be replaced by any other similar. Crystal oscillator can be put on 14-16 MHz, is not critical. Photos of the device below:

When programming the microcontroller does not need to put fuse bits, ie we select the desired controller in the program, open firmware and click flash. If the device is assembled correctly, the circuit work immediately.
Original article sourse cxem.net

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Monday, August 11, 2014

TV Relative Signal Strength Meter

This schema was designed to assist the installation of TV antennas. The signal is monitored using a small portable TV set and this schema monitors the output of the TVs FM detector IC via a shielded lead. To initially calibrate the meter, adjust trimpot VR2 to zero the meter. Trimpot VR1 is a sensitivity control and can be set for a preset reading (ie, 0dB) or can be calibrated in millivolts. Rotating the antenna for a minimum reading on the meter (indicating FM quieting) gives the optimum orientation for the antenna.
Circuit diagram:
tv-relative-signal-strength-meter-schema diagram1 TV Relative Signal Strength Meter Circuit Diagram

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