battery circuits

The 4X4 Slimtenna - Development of the Slim Jim antenna for HF

KGD - Reduced size antenna - A reduced size antenna made of two series resonant circuits with a radiant tube condenser in German

HSMM-MESH - A high speed, self discovering, self configuring, fault tolerant, wireless computer network that can run for days from a fully charged car battery with focus on emergency communications

A 2.3GHz to 432MHz receiver converter - Receiver converter that can be plugged to the backside of the Yaesu FT-817 battery powered portable transceiver

TM 241 battery replacement - Kenwood TM-241 battery replacement topic

AFR Enterprises - AFR Enterprises a leading distributor of electronic components, semicondustors, diodes, Resistors, Integrated Circuits across the USA.

Amplifiers - Care and Feeding - Antenna and Power considerations, ALC Keying interface, Battery info, Keying interfaces and more

Design Guidelines for JFET Audio Preamplifier Circuits - Design Guidelines for JFET Audio Preamplifier Circuits By Mike Martell N1HFX

Rechargeable Battery Review - Rechargeable Battery Comparisons

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

Battery Articles - A collection of battery questions and the replys from Red Scholefield, a battery engineer.

Rechargable Battery Information - All you need to know to keep your batteries fit and well!

Change Battery on DVS-2 - The DVS-2 is a CQ unit for the Yaesu Trancievers.

Car and Deep Cycle Battery FAQ - Battery consumer information and answers to frequently asked questions (faq) about car and deep cycle batteries.

Battery Comparisons in QRP Applications - AE5X battery comparison

Fast, smart NiCD/NiMh battery charger - PCB for a battery charger described in the datasheet for the MAX712/MAX713 fast charge controllers.

NiCad battery charger plan - SV1BSX project for a Nicad battery charger

Power Supply for Floating Pb Batteries - An easy-to-build power supply for floating pb batteries

Automatic Battery Charger Project - A project for an automatic battery charger from 12.6v to 13.8v

Semiconductors - Semiconductors, diodes and transistors, intregrated circuits

Low cost frequency counter - Low cost multifunctional seven digit LCD frequency counter, for your HAM radio shack

A low cost morse Trainer / Keyer - By Prof. T. K. Mani - VU2ITI

AVR Butterfly Keyer - The Atmel AVR Butterfly is a credit card sized board which contains an AVR MEGA169 processor, a six character LCD display, a five way joystick navigation switch, a piezo speaker, a 3 volt lithium battery cell for power and a few other odds and ends.

Non-relay instant RF Switching - Coax lines to do the RF switching. The advantages are instant switching, no power wasting DC control circuits.

A 12-Volt Homebrew Regen - A one-tube battery-powered regenerative receiver.