external battery

Haredata Electronics - Haredata Electronics is your one stop shop for Power Supplies, Chargers, Battery Packs & Accessories. Power Supplies Chargers, Battery Packs , Power Supply Accessories , Haredata Electronics Limited,

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

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

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

Battery Bank - Specialize in batteries and batteries charges

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

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

Adjustable Regulated Battery Charger - This battery charger circuit is regulated and adjustable to make this circuit able to charge the mosto NiCAD battery.

A NiCAD Battery Charger - A NiCAD Battery Charger with Current and Voltage Limiting

A high perfomance Crowbar Circuit - The MC3423 can protect sensitive circuity from power supply transients or regulator failure when used with an external "Crowbar" SCR.

Homebrew external speaker - PE1OPM home made external speaker project

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.

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

Signalink USB Interface - Setup notes - Hints and Tips in using the Tigertronics SignalinkUSB External USB Sound Card and Interface