Single-trace CRT converter

The single-trace type of oscilloscope is definitely one of the most widespread items of measuring equipment, and as such it is generally appreciated by those who do any kind of testing or repair on (home made) audio circuitry. However, the single-trace scope has its limitations, which are the more keenly felt when trying to compare, say, an amplifier input to an output signal. Here is an add-on design to achieve double-trace operation from that old, simple scope of yours! SINGLE-TRACE CRT CONVERTER The obvious advantages of having a second, simultaneously visible, channel available on an oscilloscope are likely to be so well known to any electronics enthusiast as to obviate the need for any further discussion. However, a close examination of the typical operation principles of the two-channel and dual-trace type of oscilloscope is essential to a basic understanding of the present add-on unit. As will be generally known, the main circuits in a standard oscilloscope may be represent...