voltage regulator 7805

Broadband Baluns - Voltage baluns and choke (or current) baluns.

Balun 1:1 - 1:1 Ruthroff voltage balun using a T200-2 Toroid core

Balun 4:1 - 4:1 Ruthroff voltage balun design using a T200-2 Toroid core

TG Electronics - Specialize in the manufacturing and sales of DC Boosters, Regulators, Converters and Accessories

SB-220 Repairs and Modifications - Heathkit SB 220 mods, replacing the Zener ZD1, replacing the plate-voltage voltage divider, adding a keying circuit for solid state transceivers

Heathkit SB-220 Meter Repair - Repairt a Heathkit SB-220 Linear Amplifier with a bad Plate Voltage meter

Changing Filament to Kenwood TL-922 - Mod to reduce filament voltage by using thinner and longer wires from filament transformer

A Precision Voltage Reference - A project by Don Wilhelm W3FPR

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

Fuses - About Fusues, current and voltage rating, type of fuses

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.

Switching Regulator Basics - Switching Regulator Basics By Mike Martell N1HFX

High voltage power supply - An High voltage power supply design by F1FRV

40 CW QRP Transmitter  ^new - Here is a easy to build and cheap CW transmitter using 40 m cristals. Power output is approximately 6 Watts for a supply voltage of 13.8 VDC

Find RFI causes in mobile operations - Troubleshooting your power supply, in determinig connections to battery, alternator and regulator interference and checking power supply leads.

SWR calculator - Online VSWR Voltage Standing Wave Ratio Calculator

RF Probe Project - If you needed the ability to quickly measure RF voltage for tuning filters and cavities this RF Probe probe is for you