voltage regulator 7805

VSWR Loss Calculator - This calculator is designed to give the efficiency loss of a given antenna, based on the input of VSWR (voltage standing wave ratio) and other subsequent factors

Build a HB 4:1 voltage BALUN for 1KW - In depth detail with photos on how to build your own HB 4:1 voltage BALUN that will run 1KW. Inexpensive and fun to build.

VSWR Explained - An interesting article on Voltage Standing Wave Ratio vs Current Standing Wave Ratio by EPARA

Small Tuned Loop AM Broadcast Antenna - Alan yates vk2zay's ham radio website, homebrew construction, general electronics, high voltage experiments, amateur rocketry, and general geek stuff

Loop Antenna Basics - Loop Antenna Basics and Regulatory Compliance for Short-Range Radio

Matching Waves, VSWR at work - When the radiation resistance (voltage to current ratio) of an antenna is the same value as the characteristic impedance of the transmission line (voltage to current ratio in the line), all of the electrical energy transmitted down the line is taken by the antenna and radiated into space in the form of a radio wave.

Basics of antennas - The current, the voltage, the impedance, the bandwidth, the polarization, and how the earth influences the famous radiation pattern.

The ElectraSlide Antenna - Modification of the DK3 design by Don Johnson, W6AAQ. No voltage dropping, operates on the full 12 volts. The control switch and the matching toroid are supplied. All you need is a standard 3/8 by 24 thread ballmount, 2 wire sheilded microphone cable for control wiring, and a CB whip cut to resonance.

FMI - FMI provides superior solutions in the design and manufacture of frequency control devices including Voltage Controlled Temperature Compensated Crystal Oscillators (VCTCXO), voltage controlled crystal oscillator (VCXO), Temperature Compensated Crystal Oscillators (TCXO), crystal clock oscillators, high temperature oscillators, surface mount and crystal oscillator products, phase locked sources and more.

FT-817 DC Circuit Protection - A schematic for a DX circuit protection for the Yaesu FT-817, provides protection from the external power supply overvoltage by DL2LTO in german

WinPic 2007 - Program bulk erases, reads, writes and verifies PIC10F, PIC12F and PIC18F families. PIC part number selection. Programmnig voltage selection. 2V to 5V/ 0.25V step. Firmware updating.

CirKits - Solar power DIY kits. Homebrew your own solar power regulator, and power center.

Increasing Amplifier Relay Speed - Article describes a circuit that accelerates the coil of DC relays by momentarily doubling their voltage.

Power Aamps RF voltages - This test circuit is easy to duplicate, and demonstrates the extreme voltages that appear in an amplifier when the load is improper for the amount of drive power applied.

Battery voltage booster - A battery voltage booster project with pictures and schematic by KD7W

Simple beacon construction notes - Here is a simple, self-contained beacon which can run a few milliwatts or as much as a watt depending on choice of amplifier and supply voltage.

Voltage protector/Fuse Assembly for 100-watt transceivers - A compact voltage protector/fuse assembly for 100-watt transceivers by AD5X

Universal frequency counter & voltage meter - to be used with QRP transceivers

6L6 Transmitter - 40 meters band 5 watts transmitter, uses a 6L6 with a 6X5 rectifier and a 0D3 voltage regulator tube on the screen.

DC to DC (12 to 24 V) Voltage Converter - This page describes a DC to DC voltage converter, pretty simple, for currents up to 500 mA by sv1bsx

Small Unregulated Power Supply Project - Here's a simple power supply that can be used in many applications. It is not regulated , so keep that in mind for voltage sensitive devices , and of course you will need to understand how to select the correct amperage and voltage for the AC transformer.

HV power supplies - WV0NNI 2,800 VDC @ 2 Amps Continuous Variac adjusts filament voltage. A voltage doubler circuit, well suited for smaller, compact linear amplifiers.

The Adjustable Voltage Regulator - N1HFX article on adjustable voltage regulator

Home-Brew Regenerative Receiver - Home-Brew Regenerative Receiver and experiments with low voltage operation.

A 2 tube regenerative receiver - A low voltage 2 tube regenerative receiver