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Alarm Phone Dialer with MT8880 and PIC 16F84A
Posted on Wednesday, April 9, 2008   •   Category: Phone Circuits


Just hook this Alarm Phone Dialer up to something you would like to monitor, for example, a high water alarm, low temperature alarm, back window, garage door, etc. When the system is activated it will call a number of programmed numbers to let you know the alarm has been activated. This would be great to get alerts of alarm conditions from your home when you are at work. The microcontroller code is provided on the site.


Active Antenna AA-7 HF/VHF/UHF, 3-3000MHz
Posted on Wednesday, April 9, 2008   •   Category: Antennas


If you have a shortwave or high-frequency receiver or scanner that is struggling to capture signals with a short, whip antenna, and you'd like the kind of performance that a 60-foot 'longwire' antenna can provide but lack the space to put one up, consider building the AA-7 HF/VHF/UHF Active Antenna described in this article. The AA-7 is a relatively simple antenna that is designed to amplify signals from 3 to 3000 MegaHertz, including three recognized ranges: 3-30Mhz high-frequency (HF) signals; 3-300Mhz very-high frequency (VHF) signals; 300-3000MHz ultra-high (UHF) frequency signals. Those bands are typically occupied by shortwave, ham, government, and commercial radio signals.


2-CH RF Remote Control
Posted on Wednesday, April 9, 2008   •   Category: Remote Control


On these pages, I will introduce Remote Controller with Radio Frequency. The electric wave sending-out is controlled with the code by PIC for transmission and the code is deciphered by PIC for receiving.


18F4550 USB Interface
Posted on Wednesday, April 9, 2008   •   Category: USB Interface Adapters


This article contains information about getting a USB interface working between an 18F4550 PIC and a PC using C# .NET 2.0, using the Microchip-supplied driver mpusbapi.dll. In this article, the PIC is configured using some (slightly modified) demo code originally for the PICDEM FS USB demo board, in which it is configured as a generic class device, with one IN + OUT interrupt endpoint. The device is set up with a bootloader, allowing the PIC to be programmed through software after the initial programming.


12V DC to 220V 100W Inverter
Posted on Wednesday, April 9, 2008   •   Category: AC / DC Innveters


This is 100W inverter circuit. It uses 4047 IC and IRF540 Mosfet instead of 2N3055 transistor. Power output is 100W from 2-3A transformer.


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