In this circuit, the wearer assembly consists of only one lamp, 6V6 or 6L6, which acts as an oscillator and as an output amplifier at the same time. Coil L1 is the medium wave oscillation coil. Of 6SA7. The coil L2 consists of 50 spools wrapped on a cylinder covered with a 3 cm diameter insulating material. The diameter of the wire is 0.5mm. The capacitor C1 is a double variable air of 1000pF (connect the two capacitors in parallel). C1 itself is C2. Through C1 and C2 we tune the transmitter from 2MC to 600KC.
Click here to download the full size of the above Circuit.
As we tune into the midwaves, the larger the antenna we need to place in the transmitter. For a medium wave antenna we use a copper conductor as long as possible. For the best result, the antenna should not form corners, but extend in a straight line and as high as possible from the ground. One end of the cathode is connected to the device and the other to the middle of the horizontal antenna or to one of the two edges, whereby the whole antenna is contiguous.
The transmitter amplifier consists of the ECC83 dual-triode and 6V6. The configuration is a protective mesh and is approaching 100%. The power supply uses a dry rectifier 220V for 100mA. We also use a transformer with a primary 220V and a secondary 6.3V to heat the lamps. Switch D1 is single-pole single-action and cuts off high voltage when we want to listen to other transmitters The range of the transmitter with a good antenna reaches 10-15 kilometers.
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.....
characters left: