Which of the referenced wave shapes would appear across test points 1 and 2 (TP1 and TP2) referring to the circuit shown in the illustration? See illustration EL-0085.
• Location of TP1 and TP2 in relation to transformer T1 and the rectifier diodes D1/D2 • Difference between a pure AC sine wave and rectified DC (half‑wave and full‑wave) waveforms • How the presence of diodes, inductors, and capacitors changes the shape of a waveform compared to the source
• Look at where TP1 and TP2 are connected: has the signal passed through any diodes or filters yet, or is it still at the source side of the circuit? • Compare each choice (E, F, H, I) and decide which ones show rectified DC with a DC offset, and which one shows an unmodified AC waveform crossing the zero line. • Think about what you would normally see across the primary of a transformer that is fed from an AC supply.
• Confirm on the drawing that TP1 and TP2 are on the primary side of T1, before any diodes. • Identify which option shows a sine wave that goes both positive and negative around zero volts, with no DC offset. • Eliminate any waveforms that look like pulsating DC (only positive lobes) or filtered DC with ripple, since those occur after rectification, not at the primary.
No comments yet
Be the first to share your thoughts!