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Updated: May 9, 2025
Now connect one end of the tickler coil with the detector plate and the other post to the fixed .001 mfd. condenser, then the other end of this to the positive or carbon pole of the B battery. Finally, shunt the head phones and the .001 mfd. fixed condenser and you are ready to try out conclusions. A Regenerative Audio Frequency Amplifier Receiving Set.
Now connect one end of the secondary coil, or rotor, to one post of a .0007 mfd. variable condenser, the other post of this to one end of the grid coil and the other end of this with the remaining end of the rotor of the variocoupler.
Get two honeycomb or other coils of the greatest wave length you want to receive, for in order to properly balance the aerial, or primary oscillation circuit, and the closed, or secondary oscillation circuit, you have to tune them to the same wave length; two .001 mfd. variable condensers, though fixed condensers will do, and two small single-throw double-pole knife switches mounted on porcelain bases.
Next connect the plate of the tube with one end of the .001 mfd. blocking condenser and the other end of this with the clip 2 on the tuning coil.
The two chief features as far as the parts are concerned of this long wave length receiving set are the variable condensers, and the tuning inductance coils. The variable condenser used in series with the aerial wire system has 26 plates and is equal to a capacitance of .0008 mfd. which is the normal aerial capacitance.
Now connect the end of the tuning coil that leads to the ammeter with one end of the .001 mfd. grid condenser and the other end of this with the grid of the vacuum tube. Connect the telegraph key, the buzzer and the dry cell in series and then shunt them around the grid condenser.
Shunt the potentiometer around the A battery and connect the sliding contact with the or zinc pole of the B battery and the + or carbon pole with one terminal of the headphone; connect the other terminal to one of the posts of the variometer and the other post of the variometer to the plate of the detector. Finally shunt a .001 mfd. fixed condenser around the headphones.
This is the same kind of a hot-wire ammeter already described in connection with the experimental set, but it reads to 5 amperes. The Grid and Blocking Condensers. Each of these is a fixed condenser of .002 mfd. capacitance and is rated to stand 3,000 volts. It is made like the aerial condenser but has only two terminals. It costs $2.00. The Key Circuit Apparatus.
Next connect one post of the .0007 mfd. condenser with one of the terminals of the detector filament; then connect the other post of this condenser with one post of the .0005 mfd. variable condenser and the other post of this with the grid of the detector, then shunt the megohm grid leak around the latter condenser.
Now connect one end of the secondary coil, or rotor, of the variocoupler with one post of the .0005 mfd. variable condenser and the other part to the grid of the detector tube. Connect the other end of the rotor of the variocoupler to one of the posts of the first variometer and the other post of this to one of the terminals of the detector filament.
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