A2565

Building a Test Light
$3.5

Intermediate 555 Timer Project

A great circuit using the 555 timer IC, 2 resistors, 2 capacitors, and a speaker to construct a high impedance probe and continuity detector.

A2595

Voltage Confusion
$3.5

Intermediate Topic

The concepts of level matching, crest factor, gain overlap, and program material are discussed in detail. Charts included.

A2561

Sound Waves
$3.5

Intermediate Topic - Acoustics

The question of “pulling” or “pushing” a soundstage is covered in this benchmark article. Questions are presented and then answered. Sound  in air is diagramed and the method of sounds traveling through a medium is discussed.

A2553

Power Supply Considerations
$2.5 Reduced from $3.5. You save $1.00!!

Intermediate Topic – Making a Power Supply

How to article on making a bench or project power supply. Regulation, pass transistors, transformers, and equalizing resistors are used.

A2550

A2 CD#102 Track 6 & IASCA Track 10
$2.5 Reduced from $3.5. You save $1.00!!

Intermediate Topic – Staging and Recording

Although seemingly simple, the seven drum beats on Track 6 of the Autosound 2000 Test Disc #102 can be very difficult to reproduce. The problems with IASCA’s Track 10 (on the old, old judging disc) are explained in detail.

A2578

Semiconductor Amplifiers
$3.5

Intermediate Topic – Transistor Amplifiers

A look into how transistors function as amplifiers. Common collector biasing, common base biasing, common emitter, and forward bias configurations are described. Six schematics and 5 pages.

A2609

Amplifier Efficiency
$3.5

Intermediate Topic on Testing

This 11-page article covers the definition of amplifier efficiency and how it is measured. Several modern amps are used as examples and many charts are included.