The following is a translation of a section from the first book of the 3 part series `Die RG¶hre im UKW EmpfG¤ng` edited by Dr. Ing. Horst Rothe in 1952. This very interesting section describes a fully differential super-regenerative self-limiting FM detector. The circuit is comprised of two synchronized self-quenched FM super-regenerative detecto
Click here to download the full size of the above Circuit.
rs which are detuned from each other to achieve a symmetric S-curve characteristic. This section came out of the chapter on super-regenerative receivers, which can be found in the original German as a pdf attachment at Der Pendelempfang fG r UKW I used the Google and Bing translators to get a first translation. I edited this automated translation result and our own Dr. Dietmar Rudolph proof read the final copy. Thank you Herr Rudolph for your continuing help with translations. A symmetrical circuit according to the off-tune discriminator [illustrated in figure 6-16] [13], [15] can be constructed with two super-regenerative stages in the same design. Such was first proposed in British Patent No. 571 580 (1942) [ GB571580 at Espacenet ], which is about the limiting effect, however, it contains an error about the operation of the limiting effect. G. Vogt and the author of this principle have both applied this principle, in the form that both self-quenched stages are operated with the same quench frequency. Both stages are then always synchronized and are highly sensitive and at the same point in time. This keeps one super-regenerative stage from being affected by simultaneous strong oscillations in the other. The requirements for the mutual decoupling are easy to fulfill with synchronous operation, so that the circuit is feasible even with a double triode such as EDD11, when it is operated with an IF that is not too high. It...
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: