SRC CLOCK SYNCHRONIZED WITH NATIONAL
SRC CLOCK SYNCHRONIZED WITH NATIONAL
INTRODUCTION
Hi, do you remember when a few years ago, on his TV network RAI broadcast time signal? That was probably one of the highlights of the day. In fact, in those days, many people were in front of that beautiful color bar depicting an analog clock, trying to synchronize their watches expertise. You will remember also, that when the asticina of seconds spent on the second 54 °, also started the transmission of five beeps sound of short duration, one per second. Then a second break at 59 ° seconds, and finally the final tone that came exactly at the expiration of the 60 th second, marking also the beginning of the next minute. Following this, a female voice calmly and decisively announcing the exact time. [read more →]
Programmable frequency for the TS-830M
Programmable frequency for the TS-830M
Hi, This frequency is designed to be inserted in place of the TS-830 player, but can also work alone and with some little ingenuity on other amateur radio equipment.
Introduction
Unfortunately, after 20 years of perfect operation on my TS-830M system has failed the card "COUNTER UNIT," appointed to read the frequency. After a brief survey of the wiring diagram in hand, it soon became clear that the problem was that the integrity Q5 TC5070P, responsible for carrying out the measure of frequency and represent the value on the display. This is a built-in 42 pins, which as stated in the data sheet contains a universal programmable to six digits. [read more →]
(Article visited: 3943)Protection against short circuits, power supplies.
PROTECTION AGAINST SHORT CIRCUITS
INTRODUCTION
Hi, would like to propose to all readers a simple circuit, through which you can implement a protection against accidental short circuits that may occur especially during the laboratory tests. The purpose is to safeguard the / the power transistors of our power. The device in question is designed to be coupled with the widely popular and versatile voltage regulator UA723, produced by the "Texas Instruments" in use in my power. As produced by other manufacturers, may happen to meet him as LM723 (National Semiconductor) MC1723 (Motorola) L123 (SGS) and so on. [read more →]
Simple but precise periodimetro with 16F84
PERIODIMETRO
Introduction.
On several occasions I had to give up pursue projects of personal interest, just because I did not have adequate instrumentation to measure subsonic frequencies. For such low values because the frequency generally allows resolutions of + / - 1Hz. A further step is necessary to use the periodimetro that says the same word, making the measurement of the period of a signal, it returns more accurate values of the resolutions of fractions of Hz [Read more →]
(Article visited: 5070)Programmable Cyclic Timer 24h.
Programmable Cyclic Timer
Introduction
Hi, I am presenting is the circuit that arose out of food daily and at regular intervals four different devices with the ability to prefix regardless of the time on and off, several times a day. Since various fields of possible application of the circuit in question, I wanted to make it available to all through the pages of this site. I'm using in my tank, especially during my departure from home, which is distributed at regular intervals to feed the little fish and turned on the interior light for illumination of the seedlings. But it would be useful also in the type of lighting shops to change automatically or to turn on the neon sign outside a scheduled basis. In the workplace we can turn lights, sirens, motors etc.etc. [read more →]
