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不少电子爱好者在阅读本刊文章后,对提供的电路、产品设计、原理、方法进行试制和研究,积极来信反映试制和研究的成果,有些还提出改进意见和建议。 为了促进读者和作者以及读者之间的信息交流,这些来信和文章我们将在“回音壁”栏目上刊登出来。本期刊登孙立恒同志的来信和黄杨同志的文章,分别对刊登在’94-3期的《使录音带记录量成倍增加的方法》一文和刊登在’ 94—4期的《实用水塔水位自动控制装置》一文提出更完整的电路连接方法和改进建议。热烈欢迎读者积极来信来稿。
After reading this article, many electronic enthusiasts have tried and tested the circuits, product designs, principles and methods provided, and have actively sent letters reflecting the results of trial production and research. Some have also put forward suggestions for improvement. In order to facilitate the exchange of information between readers and authors and readers, these letters and articles will be published in the “Echo Wall” section. This issue contains an essay by Comrade Sun Liheng and Comrade Huang Yang’s article on how to automatically adjust the water level recorded in ’94-4 ’ Device "a more complete circuit connection methods and suggestions for improvement. Warmly welcome readers to write a positive letter.