im3500


Posted on Feb 4, 2014

This circuit is easy to build and uses standard components available at any Radio Shack store. It accepts the audio tone output of a code practice oscillator or short wave receiver and converts those tones into the DC voltage necessary to operate an old-time telegraph sounder. This lovely set with original shipping box was used for practice only. A small key knob is mounted directly


im3500
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on the sounder arm and produces a resounding "click whenever it is depressed. (Same as number 315. ) 3051 * BUNNELL SIMPLE NON-ELECTRIC PRACTICE SET: (12KB) This interesting set was used for practice only. A small key knob is mounted directly on the sounder arm and produces a resounding "click whenever it is depressed. 3053 * BUNNELL ARTICULATED NON-ELECTRIC PRACTICE SET:(15KB) Interesting combination of a brass sounder and telegraph key with a mechanical connection whereby pressing the key causes the sounder to move downward to make a click. It was used to provide practice sounds for people learning the Morse code without the need for batteries and wiring. (Same as item 325. ) 3055 * "AUDIO ALPHABET" MANUAL CODE PRACTICE SENDER:(22KB) This set consisted of a manually operated device which pulled a paper tape past a set of contacts which sensed holes in the tape and sent dots and dashes for code practice purposes. (This unit is in the John Casale - W2NI collection. ) 3060 "OMNIGRAPH" AUTOMATIC CODE PRACTICE SENDER:(41KB) This mainspring-driven Omnigraph was used to key a sounder to provide random morse code characters for practice. It has fifteen code wheels which are notched with dots and dashes and can be shuffled or replaced to provide an unlimited number of combinations of characters. A mechanical speed governor adjusts sending speed. It shifts from wheel to wheel according to settings of "Kicker strips". Key-wound...




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