Building a real metal detector!
The project in question is a semi-professional unit, is a project that I started from NEW ELECTRONICS, I have modified, simplified and improved.
A bug in FM
NOTICE:
Eavesdropping by electronic monitoring and any other form of audio without the consent of those being monitored is considered a violation of privacy, and is illegal in most or all of Italy. I do not take any responsibility about the misuse of this circuit. This article was written exclusively for educational purposes.
REMOTE TELEPHONE VOICE
REMOTE TELEPHONE VOICE
INTRODUCTION
Hi, some time ago I had occasion to appreciate the potential of a famous chip produced by the U.S. FDI in technology DAST (Direct Analog Storage Technology). This is a really amazing chip: The ISD1016, suitable for recording and playback of voice messages, in which we find everything you need for analog to digital conversion, as well as a microphone preamplifier with AGC, a memory bank EEPROM for permanent storage of the messages, with related circuitry for the addressing of the same, a digital to analog converter followed by an amplifier of BF for listening directly in the speaker, in addition to the filters that demarcate the passband. [continues Read more →]
SRC CLOCK SYNCHRONIZED WITH NATIONAL
SRC CLOCK SYNCHRONIZED WITH NATIONAL
INTRODUCTION
Hi, do you remember when a few years ago, the RAI on its TV channels broadcast time signals? That was probably one of the highlights of the day. In fact, in those days, there were many people 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 seconds spent on the 54 th second, also started the transmission of five beeps sound of short duration, one per second. Then a second break at 59 ° second, and finally the last voice 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 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 →]
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