Hobby Projects - Insulation tester, LED Circuits, Meters.

Saturday, March 07, 2015

DL4YHF - Ham Radio and Homebrew

This page provides some tools (software by myself), hardware, and other information for radio amateurs, and some other not-radio-related stuff like the PIC programmer.

Frequency counter with a PIC and minimum hardware

This document describes the construction of small frequency counter with a cheap PIC microcontroller and a few seven-segment LED digits. The main features of the frequency counter are: frequency range 1 Hz ... 50 MHz (prototype worked up to 60 MHz but this exceeds the PIC's timing specifications)

Frequency counter with a PIC and minimum hardware

Frequency counter with a PIC and minimum hardware
by Wolfgang "Wolf" B├╝scher, DL4YHF - frequency range 1 Hz … 50 MHz

DL4YHF - Ham Radio and Homebrew

Thursday, March 05, 2015

RASON Projects Page - Amateur Radio

Designing Bipolar Transistor Audio PreAmps, Designing JFET Transistor Audio PreAmps, Designing Op Amp IC Audio PreAmps, Switching Regulator Basics, Using Transistors As Switches.

RASON Projects Page - Amateur Radio
  • 10 Amp, 13.8 Volt Power Supply
  • 12 Volt Gel Cell Charger
  • Thermal Fan Controller
  • Transistor Audio Amplifiers
  • 12 Volt Gel Cell Charger
  • Switching Regulator Basics
RASON Projects Page - Amateur Radio

A Potpourri of Audio Amplifiers  By N1HFX

"I intentionally avoided the use of IC amplifiers to provide a real learning experience for audio amplifier design. Although many IC amplifiers provide excellent performance at low cost, we need to learn the basics first. I will address IC audio amplifiers in a future article."

The Radio Amateur Society of Norwich
P.O. Box 329 - Norwich, Connecticut 06360

Sunday, March 01, 2015

Beagle Board - Create Open Embedded Devices

The Beagle Board is a low-cost, fan-less single-board computer based on Texas Instruments OMAP35x processors featuring the ARM Cortex-A8 core.

Beagle Board - Create Open Embedded Devices

The USB-powered Beagle Board is a low-cost, fan-less single board computer that unleashes laptop-like performance and expandability without the bulk, expense, or noise of typical desktop machines.

BeagleBone Black - Boot Linux in under 10 seconds and get started on development in less than 5 minutes with just a single USB cable.

BeagleBone Black

OMAP3530 processor highlights:

Over 1,200 Dhrystone MIPS using the superscalar ARM Cortex-A8 with highly accurate branch prediction and 256KB L2 cache running at up to 600MHz. HD video capable TMS320C64x+ DSP for versatile signal processing at up to 430MHz.

Buy a BeagleBoard at Digikey

Some Projects on BB

beaglelab - BeagleLAB is an Embedded Developer's Workbench

BeagleBot - Beagle powered robot - A small experimental robot with Beagle Board as it's heart.