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AVR 323 Board - schematic for an ATMega323 boards ( Mega is pin compatible
with AT90S8535) The main interface to this board is RS232 (added 09/05)
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AVR AT90S2313 composite PAL colour Bar generator - (electronic circuit added
4/05) |
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AVR based oscilloscope - A mega32 based low speed oscilloscope. It can be
used to measure signals up to 5 kHz. The input voltage range can be up to 24V AC or
30V DC.….(Circuit design added 03/09) |
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AVR Beacon Super Keyer - The keyer will send both "Normal" and "DX mode"
Feld-Hell, at the standard 122.5 bits/second, as well as half-speed, quarter-speed and
eigth-speed. The slower speeds are less affected by multi-path, and are also less
affected by noise. Slow speeds are no problem for beacon use, since little data is
involved.... |
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AVR composite PAL colour bar generator - After lof of reading books,
articles and discussions with lot of electronic technicians, finaly I did it. I make
an 6 colour bar generator entire-in-software with AT90s2313-10 overclocked at
17.734475 MHz !!!….(Circuit design added 05/09) |
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AVR Digital Voltmeter - Most electronics hobbyists these days find a digital
voltmeter indispensable. Indeed, having more than one is a positive advantage!This
little project with six voltmeters in one inexpensive box therefore has some very
useful features for the hobbyist....(electronic circuit added 8/03) |
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AVR Frequency Counter - How would you like a 40 MHz frequency counter for
under $50? What if I told you it also had an 8 digit LCD display, optional offsets for
use in a receiver or transceiver, 10 Hz (even 1 Hz!) resolution, and also a six
channel digital voltmeter built in? Direct reading with prescalers in the VHF version?
Oh, and optional PC telemetry so you can watch the output on a PC, log the results, or
graph drift....(electronic circuit added 8/03) |
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AVR In-Circuit Programmer - The programmer is very simple to build. It
contains one IC and a couple of connectors. As you can see below, with some ingenuity
it is possible to squeeze all the circuitry into a DB25 connector shell. The IC can be
a 74HC244 or a 74LS244. The more normal means of construction is with a small circuit
board, with the DB25 connector mounted on one edge, and a header to connect the ribbon
cable. The programmer is designed to work with all the AVRâ„¢ family micros, and with
the Atmel "ISP" programming software. ….(electronic schematic added 11/08)
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AVR In-System Programmer - In-System Programmer (ISP) This programmer can
program lot of AVR micros and its working with AVR Studio 4.….(electronic schematic
added 05/09) |
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