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466
Radio Broadcast
the transformer in place, mark the holes with a scriber.
The brass brackets are bent and drilled in accordance with the layout shown in Fig. 6.
With this preliminary preparation accounted for, the work of assembly is next in line. The several parts are mounted in order named, from the top of the panel down; first filament switch, then rheostats, and grid leak, next sockets and finally jacks.
For the sub-base, first mount all the binding posts having the lugs on the under side of the panel and pointing in toward its middle. Next mount the panel upon the brackets and after this is done, secure the two transformers firmly with |-inch x -3% round head machine screws. The cores are placed at right angles to each other as may be seen from the schematic wiring diagram Fig. 7 and the illustrations.
The completed sub-base unit is fastened to the panel by two round head brass or nickel plated machine screws \ inch long.
THE UNIT
IN AN assembly job as compact as this, it is absolutely essential that insulated wire be used, at least where there is danger of short circuits. In the unit described, insulated wire has been used throughout. Contrary to what one might think, the wiring job is simplicity itself. It is only to be remembered that the wires should run direct from one part to the other without unduly twisting or bending them. The schematic wiring diagram in Fig. 7 will be of aid here.
Wherever possible, lugs have been clamped down under terminal nuts to provide an easily accessible point of soldering.
As a standard detector-tv/o-stage audio amplifier, this unit is admirable for use around the laboratory where the experimenter is frequently trying new tuner circuits and requires a means for detecting and amplifying his received signal. Its primary purpose is for use with the two-stage radio-frequency amplifier described in the May, 1925, Radio Broadcast.
Radio Broadcast Photograph
FIG. 13
Looking at the amplifier from the right side