Programmable frequency for the TS-830M
Programmable frequency for the TS-830M
Hi, This frequency has been specially designed to be inserted in place of the TS-830 player, but can also work alone and with a few tips 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 operating frequency. After a brief survey of the wiring diagram in hand, it soon became clear that the problem was that the Q5 sull'integrato TC5070P, in charge of making the measurement 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: 4099)Power protection against short circuits.
PROTECTION AGAINST SHORT CIRCUITS
INTRODUCTION
Hi, I would propose to all readers a simple circuit, through which you can implement a protection against short circuits that may accidentally occur mainly during laboratory testing. The purpose is to safeguard the / power transistors of our feeders. The device in question is designed to be coupled to both diffuse and versatile voltage regulator UA723, manufactured by "Texas Instruments" in use in my feeder. As produced by other manufacturers, may happen to meet him as LM723 (National Semiconduttor) MC1723 (Motorola), L123 (SGS) and so on. [read more →]
Simple but precise period meter with 16F84
Period meter
Introduction.
On several occasions I had to give to 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 should use the period meter that tells how the same word, by measuring the period of a signal, it returns more accurate values of the resolutions of fractions of Hz [Read more →]
(Article visited: 5304)Programmable Cyclic Timer 24h.
Programmable Cyclic Timer
Introduction
Hi, I am presenting the circuit was born out of food daily and at regular intervals four different devices, with the possibility of prefissarne 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 for feeding on small fish and the inner light for illumination of the seedlings. But it would be useful in the shops to change the type of lighting automatically or to turn on the neon sign outside a scheduled basis. In the workplace we can activate lights, sirens, motors etc.etc. [Read more →]
We investigate on TV remotes saba
RX and TX-365 Remote SABA
Introduction
Hi, I would describe this experience when I conducted last summer, going over with you, all the stages that I have then led to the creation of a decoder for the TV remote control signals. The original purpose of my task was to analyze the signals from the remote of my TV, to investigate the code and the type of modulation. As you see anything special, in fact, this work aims mainly to be a basic study for possible future developments and expansions. [read more →]
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