With only four transistors and four resistors, the diamond buffer does not require much. Some harsh critics would add that it does not deliver much either. I have covered the circuit and its modification here before, for example in Blog 232 and Blog 187. But for over a year, I have been meaning to write about a significant modification to the basic circuit that I
Click here to download the full size of the above Circuit.
came up with. In fact, I planned on including it in my last post. Here is the big problem with the naked diamond buffer circuit: it works great as long as you do not ask to work hard, which is a tad bit sad, as that`s exactly what we want from a buffer. The makers of OpAmps know about this problem and they have come up with some clever workarounds, such as this circuit found in the OPA633. As long as the input stage can handle driving the output transistors, the two transistors nested inside do nothing; in fact, they are not even turned on. But once the input stage falters, they begin conducting and take over the task of driving the output transistors. Clever, very clever. The LMH6321 tackles the same problem in a different way: it builds a very robust, dual, push-pull, input stage that can easily drive the output transistors to full output. (The actual circuit is more complex, but I erased the protection diodes to make the topology more readily apprehensible. ) Each output transistor gets its own three-transistor, push-pull, driver stage. These elaborate topologies are necessary in an OpAmp, as it is impossible to include large-valued capacitors within the OpAmp`s small plastic package. On the other hand, if we build up a diamond buffer out of discrete transistors and resistors, we can add as many big electrolytic capacitors as we please. Indeed, just adding one big electrolytic capacitor makes a big improvement in the...
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: