The 100W4 is a two tube medium frequency transmitter with provision for pre-tuning to three frequencies in MF band and for type A1, A2 and A3 emission. For type A1 the two tubes operate as parallel oscillators and for A2 and A3, looking at the set from the front, the left hand tube serves as a oscillator and the right hand tube as a modulator. The
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oscillator is directly coupled to the antenna and antenna itself is therefore a main part of the oscillator LC circuit. With approximately 200 watts input the output is approximately 100 watts and therefore the efficiency is approximately 50%. (slightly over 55% on CW and somewhat less on RT and TT). Generator. Cumulative compound DC two armature windings. One armature winding terminates at a commutator at one end of the generator to provide from approximately 10 - 15 volts at a maximum 12 amps approximately 150 watts. The other winding terminates at the other end of the generator at a commutator having more and finer segments than at the 12 volt end and has a maximum output of. 4 amps at 1000 volts (400 watts). There are two series fields one in the 12 volt circuit and on in the 1000 volt circuit. The generator also is provided with a common 12 volt shunt field in series with which is a hand controlled field rheostat. The motor and generator are coupled together by means of a semi flexible coupling. Normally there are four flexible leads running from the wave change switch on top of the transmitter to the main tuning inductance which is about a foot in diameter and has 44 turns of heavy flat copper winding (provision is made for a fifth lead which is only used when a counterpoise is necessary in the antenna system). For each frequency to which the transmitter is to be tuned a set of four detachable jacks is necessary....
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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