[minima] Re: Need parts advice
- From: Arv Evans <arvid.evans@xxxxxxxxx>
- To: minima@xxxxxxxxxxxxx
- Date: Sat, 18 Jan 2014 11:05:33 -0700
ATMega328P is a 28 pin microcontroller of the standard ATMEL RISC
architecture. Farhan used a P-DIP form factor device.
<http://goo.gl/GuUlfG>
ARDUINO is a design that adds a boot-loader to AVR microcontrollers
and uses "sketch" language to write programs for that platform.
<http://arduino.cc/>
The Si-570 is a DDS-like XO-VCO chip which uses a different layout
than the popular AD98xx DDS devices that most are familiar with. The
Si-570 is reputed to have less spurious signal outputs than the AD98xx
devices. Farhan cautions us that only the CMOS version of Si-570 is
suitable for the Minima design.
<http://goo.gl/oPdgX>
It seems possible to build the Minima as a single-band rig with a
conventional VFO and digital readout. The higher frequency VFO may
require something like Huff-and-Puff stabilization for best operation.
A digital dial type frequency readout could be used to indicate operating
frequency. While not a true Minima Transceiver, this could let us trial
the general design without having to resort to programming a
microprocessor and without needing the Si-570 XO-VCO device.
This is my present build approach. Once I have this working I can then
add the AVR and Si-570 to make it into a real "Minima Transceiver".
Arv - K7HKL
_._
On Sat, Jan 18, 2014 at 6:20 AM, <jerry@xxxxxxxxxxxxxxxx> wrote:
> I'm brand new to the Arduino stuff and need some help. I've programmed
> many Microchips but never an ATMEGA. The only ones they have for sale
> are listed as ATMEGA328P-PU. is that the same as the ATMEGA328P. The
> data sheet is 570 pages and doesen't specify a difference between P and
> P-PU. And do I need a bootloader? or is that already included in the
> code Farhan wrote. I have all the parts except the main chip and the
> Si570, which I can get from Digi-key for 13 bucks. Jerry
>
>
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