This oscilloscope clock project uses a PIC 16F876 and a DAC to generate X and Y signals to draw a clock on the oscilloscope. The original circuit and software was designed by OZ2CPU, which can be found here:. The clock circuit was slightly modified to use a different DAC from Texas Instruments. The 60Hz signal was obtained from the AC side of a
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12VAC (NOT DC) wall adapter and the current is limited with a 10K resistor. Below is the schematic of the minimal oscilloscope clock circuit: At first I didn`t bother building the entire oscilloscope from scratch because I had a handful of oscilloscopes sitting around. However, the only working oscilloscope I had with a Z axis input was the Tektronix 7704A, but experiments showed that the blanking signal from pin 26 of the PIC was not entirely necessary. The blanking is only used to supress any lines from appearing while the DAC quickly changes from a point to another point. It turns out that the vectors are drawn so quickly that there is almost nothing visible between points without the blanking signal. Omitting the use of the blanking signal makes this circuit more versatile for a wide range of oscilloscopes with simple X and Y inputs, including vacuum tube oscilloscopes! However, the graphics are stable and crisp with DC coupling to the oscilloscope. Most tube scopes use AC coupling, but if the deflection amplifiers are designed well then the graphics will look pretty good. The only downfall with AC coupling is a degree of image distortion and the image will drift around the CRT face, but the benefit of the drifting is a reduced risk of phosphor burn on the screen. The two switches (SW1 and SW2) sets the time, but I`m not sure which switch does what so you`ll have to find out. One switch will change the clock mode which...
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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