As found in SLAA458, the revised pulseoximeter application, I`ve attached an image of the USB schematic that is used to output collected data. I just had a few questions about this schematic. 1) What do J3 and J6 correspond to I can see the corresponding node names on the Ft232BM chip on J3, but these two are not present in any other schematic of
Click here to download the full size of the above Circuit.
the project. Is this simply a 7-pin header used to tidily connect components to the chip 2) In the lower left hand side of the schematic, there are two connections labeled IC2P with pin numbers going from ground or vcc. Does this simply mean pins 26 and 3 need vcc while pins 17 and 9 need to be grounded 1) Yes, J3 and J6 are just pin connectors with the named signals on them. If you have a BOM for this schematic, it may list package information. But most likely these are just breakout pins. 2) Yes. The chip likely has more than one VCC/GND pin. Many higher-integrated chips have, to allow easier bonding inside. Or to prevent voltage drops because of higher currents through the thin internal bonding. 3) Yes again. Crystal layout is a difficult thing. There are soem threads abotu this in this forum. Basically: avaoid anything near teh crystal and its connections to the chip that can form parasitic (and even more unbalanced parasitic) capacitances, as well as signals that can crosstalk to (or from) the crystal. Before posting bug reports or ask for help, do at least quick scan over this article. It applies to any kind of problem reporting. On any forum. And/or look here. If you cannot discuss your problem in the public, feel free to start a private conversation: click on my name and then `start conversation`. But please do so only if you really cannot do it in a public thread, as I usually read all threads. And I prefer to...
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: