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Updated: May 22, 2025
Begin by laying the various parts out on a base or a panel with the loose coupled tuning coil on the left hand side, but with the adjustable switch of the secondary coil on the right hand end or in front according to the way it is made. Then place the variable condenser, the rheostat, the crystal detector and the binding posts for the head phones in front of and in a line with each other.
Next connect the sliding contact of the primary coil with the other post of the variable condenser and from this lead a wire on over to one of the terminals of the filament of the vacuum tube; to the other terminal of the filament connect one of the posts of the rheostat and connect the other post to the or negative electrode of the A battery and then connect the + or positive electrode of it to the other terminal of the filament.
The small size is fitted with a pair of terminals while the larger size is provided with taps so that the voltage required by the plate can be adjusted as the proper operation of the tube requires careful regulation of the plate voltage. A dry cell battery for a plate circuit is shown at B. The Filament Rheostat.
Set the vacuum tube amplifier back of the rheostat and the A and B batteries back of the parts or in any other place that may be convenient. The fixed condensers and the grid leak can be placed anywhere so that it will be easy to connect them in and you are ready to wire up the set. Connecting Up the Parts for a Crystal Detector.
Whatever you do be careful not to get the plate connections of the battery reversed. Now connect one of the posts of the rheostat to one terminal of the filament and the other terminal of the filament to the or negative terminal of the A or storage battery and the + or positive terminal of the A or storage battery to the other post of the rheostat.
You can, however, get very good results without any special charging arrangement by simply connecting one post of the rheostat with the negative terminal of the filament and connecting the low potential end of the secondary of the tuning coil with the or negative electrode of the A battery. This scheme will give the grids a negative bias of about 1 volt.
It was altogether too late to get over there to warn her, perhaps even to rescue her. What could we do? If we could only shout for help. But what good would that do, around a corner and so far away? The vocaphone itself! Quickly Kennedy turned another switch, of a rheostat, which accentuated a whisper to almost a shout. "Don't be alarmed, Senorita," he cried. "This is Kennedy talking.
Connect one end of the filament with the + or positive electrode of the storage battery, the or negative electrode of this with one post of the rheostat and the other post of the latter with the other end of the filament; then connect clip 3 with the + or positive side of the storage battery.
For this transmitter you require: one oscillation transformer; one hot-wire ammeter; one aerial series condenser; one grid leak resistance; one chopper; one key circuit choke coil; one 5 watt vacuum tube oscillator; one 6 volt storage battery; one battery rheostat; one battery voltmeter; one blocking condenser; one power circuit choke coil, and one motor-generator. The Oscillation Transformer.
Connect this filament terminal with the or negative electrode of the A battery and the + or positive electrode of this with one post of the rheostat and lead a wire from the other post to the free terminal of the filament.
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