Welcome to my technical web site which is dedicated to RF Communications, Test Equipment and related topics in both old and new technologies plus a few non-electronic ideas. New items are regularly added and subject related items are being re-grouped within the highlighted menu fields for ease of access and future expansion. A number of example PCB layouts have been added to their respective circuit pages.

The site map shows the relative positioning of all pages on this site.

If you have any questions or comments on the contents of this site please email me at G3OOU(at)AOL.COM - replace (at) with @ when emailing.

Bob F Burns G3OOU - Electronic Design Centre

My Technical and Commercial Experience

Crystal Palace Radio & Electronics Club

My Admin / Sales Site

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1. Unless otherwise stated, all information on these pages is copyright R F Burns 1999-2020 and may only be used by private individuals for non-commercial applications.

2. These web pages were last updated on 25 April 2020.

3. This web site was built with Serif Web Plus X8 and the only cookies are the visitor counter and Google Analytics.

4. This and the associated administrative/sales site undergo continuous development so please enter each site via their respective home pages and check and update your bookmarks - page refreshes (F5) may be required.

5. Some of the processes described in these pages make assumptions about the skills and tools required to carry them out and some of the circuits contain lethal voltages. If in doubt seek experienced help before you start.

Aerials & ATU Menu (U)

Low Cost Design

Software (U)

Amplitude Modulators

Measurements Menu

Solid State Circuits Menu (U)

Cleaning Old Components

Mechanics Menu

Sources of Information and Parts

Control Circuits

Music Electronics

Surge Current Limiter

Crystals and Filters Menu

Painting and Lettering Panels

Switch Wafer Repair/Rebuild

Design Menu

PC Board Menu

Temperature Controller

Electromechanical Circuits

Permeability Tuned Oscillator

Test Equipment Menu

Fault Finding / Repairs Menu (U)

PIC Applications Menu

Heathkit Projects / Information

Power Supply Menu (U)

Useful Formulae

Inductors & Tuned Circuits

Receiver Design Menu (N)

Useful Tools


Re-engineered Heathkit Units

Vackar VFO

LC Filters Menu

Reforming Electrolytic Capacitors

Valve Circuits Menu

Bob F Burns  


Amateur Radio Callsign G3OOU

G-QRP Club Member 6907

Instructor and registered RSGB Assessor

Newsletter Editor - Crystal Palace Radio & Electronics Club

N) = New, (U) = Updated, blank = no recent change

Best Wishes