TECH Signal 133
Electrostatic radar-tube TV project stalls after oscilloscope dies
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Illustration only Photo by FatBox Media on Unsplash
A hobbyist's attempt to display TV on a 3JP7 radar tube using electrostatic deflection and custom high-voltage driver boards is paused after his Tektronics oscilloscope failed during debugging.
This project demonstrates the practical challenges of driving electrostatic-deflection CRTs, which require voltages up to 1,200V and sometimes 3,000V for post-deflection anodes. The failure of the debugging oscilloscope halts progress, highlighting how dependent such work is on reliable test equipment. For engineers, it underscores the need for robust instrumentation when working with high-voltage analog circuits.
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The project aims to display TV pictures on a 3JP7 radar display tube using electrostatic deflection.
Eric Schlaepfer's three-board driver set converts low-voltage video to up to 1,200V for the CRT.
The project is on hold because the Tektronics TDS744A oscilloscope died during troubleshooting.
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