Site Map


Parent Page

Linked Page(s)

Parent Page

Linked Page(s)

Aerials and ATU Menu

Aerials and Feeders

Permeability Tuned Osc’r

Aerial Matching Unit

Aerials - VHF

PIC Applications Menu

Push Button Processor

Amplitude Modulators

Power Supply Menu

Power Supplies (HV)

Cleaning Old Components

Power Supplies (LV)

Control Circuits

Crystals and Filters Menu

Crystal Filters

Crystals for IF Filters

Crystal Measurements

Progressive Rec’r Design

AF Amplifier

Crystals Photo

AF Filter

Design Menu

Design Process

AM/AGC Detector

Historic Designs

Crystal Set

Kit Design

DC Rec’r/Product Det’r

Progressive Receiver Design

Power Supply

RF/IF Amplifier

Electromechanical Circuits

Tuned Circuit Data

Fault Finding

Re-engineered Units

Heathkit Projects/Information

Re-engineered Units

Aerial Matching Unit

FM Module

Reforming Electrolytics

IF Filters 1

Simple RF Detectors

IF Filters 2


New Control Knob

New Inductors

PS-1V4 Power Supply

Solid State Circuits Menu

1  RF/IF Amplifiers (U)

PS-23 Power Supply

2  RF Oscillators

PSU-25 Power Supply

3  Linear LF Detectors


4  Active Filters

RF Switchbox

SB-101 Modifications

5  LF Amplifiers & Buffers

SB-101 Rebuild

6  LF Oscillators

SB-101 Refurbishment

7  RF Mixers

SB-104 Modificationas

8  AM Detectors & AGC

SB301 Rebuild

9  H-Mode Mixers

SB-401 Changes

10 Relay Switching

SB-Line Inductors

11 High Dynamic Range Amplifiers

Spares and Repairs

12 Electronic Switches

Station Console

13 Speech Processor

SWR Bridges


Valve PSU

15 FM Module

Valve Transverter

16 Broad Band Transformer

WARC and Other Bands

17 Mixer Terminations

Sources of Information/Parts

Surge Limiter

Switch Wafer Repairs

Temperature Controller

Inductors and Tuned Circuits

Test Equipment Menu

Absorption Wavemeter


AF Distortion Meter

AF Oscillator

Kit Designs

Active Mixers

Crystal Activity Meter

AF Amplifier

Crystal Calibrator

AF Filter

Digital LC Meter

AM Detector

Dummy Load

Basic Multimode Transceiver

Gate Dip Oscillator

Bidirectional Mixer

LC Bridge

Crystal Set

Logarithmic Detector

Digital Receiver

Modulation Meter

Direct Conversion Receiver

Noise Generator

Product Detectors

Off Air Frequency Standard

RF/IF Amplifier

Return Loss Bridge

Simple Transmitter

Scope Probe Information


Simple RF Detectors

Spectrum Analyser

Temperature Test Box

Valve Tester


Typical Receiver Block Designs

LC Filter Menu

Bandstop Filters

Useful Formulae

HF Bandpass Filters

Useful Tools

Quadrature Hybrid BPF

Vackar VFO

Download Calculator

Transmitter Filters

Valve Circuits Menu

Valve Circuits 1

Logarithmic Detector

Valve Circuits 2

Low Cost Design

Measurements Menu

FM Deviation Measurements

Valve Circuits 3

Rec’r Sensitivity Tests

Valve Circuits 4

Valve Circuits 5

Mechanics Menu

Control Knob

Valve Circuits 6

Indicator Dials

(B = Battery Valve Circuits)

Valve Circuits B1


Valve Circuits B2

Valve Circuits B3

Music Electronics

Valve Circuits B4

Painting and Lettering

Valve Circuits B5

PC Board Menu

PC Board Construction 1

PC Board Construction 2

PC Board Layout 1

Symbol Explanation

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