In many discussions of LPAM transmitter design you will hear or read references to `the Wenzel circuit` or `the Wenzel transmitter. ` These refer to the clever transmitter design downloadable at During the mid 1990s and early 2000s, this was the best available AM transmitter circuit if you wanted to build something yourself for around-the-house `yardcasting. ` The range is
Click here to download the full size of the above Circuit.
limited but the sound quality is good compared to other homebrew circuits that were published at the time. An updated, illustrated web page about this circuit, including a modified version with a different output section, is published by Mr Wenzel himself at Below are some comments that were published in various newsgroups about the original version of the circuit. It`s fascinating to see what a detailed analysis and spirited discussion this circuit received! Is that the little transmitter that Syl says is among the best he`s tried If so, I am using that as a basis for my design. If an LC works in place of the crystal, I`ll certainly give it a try. - Joe Yes it is. It`s also on my website. The only really good design so far. I use planar transistors (2N5551) to replace the 2n4401 because I had them on hands by the dozen and I can drive them with 150V. (like I need it. ) I suspect any 2SCxxxx from the junk box might also work. Now that Sal sent me a crystal, I`ll replace the LC I replace it with. I think Bill M. also did this with his. Even on the scope. At least not within it`s "useful" range with wrong antenna loading. With the proper loading (which is somewhat important for increased range), sound is excellent. If unproperly loaded, close to the transmitter the sound is excellent too but the range suffers a *lot. It does distort outside the "useful" range but I think it is caused by the weak signal (some of my radios are...
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: