I have attached a document of the circuit explanation of my ultrasonic range meter. But now I want to know if Im going to insert with in series with my 1M ohm resistor for the feed back of the op-amp to tune it for perfect 100db if the pot is not going to cause a bit of inductance due to the high frequency.
Can you please help me with some calibration features/tips I can added into my circuits
Thanks and regards
oscillation circuit to control the sending-out time of the ultrasonic pulse.
The time of the oscillation pulse can be calculated by the following formula. Actually, with the error of the parts, it is different from the calculation a little.
The ultrasonic signal which was received with the reception sensor is amplified by 1000 times(60dB) of voltage with the operational amplifier with two stages. It is 100 times at the first stage (40dB) and 10 times (20dB) at the next stage.
I need to know as making an amplifier with a port USB as music storage in a memory Flash, which circuit integrated as independent DAC can use could give me some diagram that could use.
Greetings and respects
This is a very old emial from my thunderbird archive.
This project is a stand alone MP3 player, designed for home, car, or portable use. It plays a group of MP3 files stored on a standard or laptop IDE hard disk drive... hundreds of hours using even today's low-cost drives.
The firmware is available under the GPL, for anyone who want to really customize the player. High quality audio output is provided by a 24 bit DAC, using both standard line-level outputs and an amplified headphone output.
Any Device with Computing Abilities and an Integrated Screen of Size 7
Inches or more can be called a Pad, Tablet, Netbook, Laptop, Notebook
or Desktop according to the size and use.
In this Professional, Serious and Productive Work can be done.
The All-in-One Low Power Desktop PC or the Nettop clinging behind the
Monitor are the “Heir Apparent” of your Erstwhile Power Hungry Tower
The 14-15 inch Notebooks with or without being convertible to Touch-Tablet is the clear winning computing device.
Innovate Next Notepad
The Mousepad and Mouse have to be Integrated in the side of the keyboard. The Touchpad has to be replaced by some Invention.
We could slide a tray on the right of the Laptop, which becomes the
Mousepad or GesturePad. A low profile flat wireless mouse docked at the
bottom of the Laptop (wireless charging on dock) is removed and put on
the Pad. The Mouse is back …..life is much much better.
It could also be just a GesturePad as big as a mouse pad, A sturdy
thin unbreakable reinforced poly carbonate pad that slides into the
Notebook when not in use.
To use it, keep the entire palm on the pad and make Touch-Screen like
Gestures, The three main fingers all can tap to simulate
click/double-click and even the page scroll with middle finger.
An Embedded Device less than 5 Inches is a Portable Communication and
Gaming Device only. This is not good enough as a Computing Device.
What we now need is the GesturePad that slides from the right of the Laptop along with TouchScreen Laptops that have already arrived.
Here is an example how i feel a DTH portal can interleave with interactive optical/wireless networks on land.
Let us assume Simtel has a DTH Channel. They broadcast MS updates from
10.00 AM to 10.30 AM. Linux updates at 11.00AM and Mac at 9.00 AM. All
updates, some repetitive in gzip format and a advance xml feed
indicating and enabling parsing of content on a digital device.
From 1.00 PM to 5.00 PM is subscriber time. "Your favorite software is
'played' at these times". A user can use his phone or tablet to request a
media. paid or free. All software will be broadcast at the time slot.
With a xml feed/sitemap.
The user transfers the software from dth box to his computer using
usb/lan. If he has been mailed dual layer decrypt keys he will be able
to unzip the paid software. Else he can look thru the
formatted/presented xml for any free software/media he would like to
DTH software providers can monetize using software developers to
publicize their demo versions. Other firms from computers to toothbrush
providers can give a "Media Promotion Pack" with
wallpapers/freeware/video/audio/presentations and discounted/free
Auxiliary Software Media DTH Download Box - Reduce Net Congestion
# Either you connect the USB of this Download-Box to Router to make a
media server for your Netbooks & Tablets or plug it to your Desktop
# This has a Tiny LCD Touch Screen, Key in the URL & Press Get,
Wait. Media ready beep will come in a few secs. Satellite Delays don't
# Invent something like Satellite Software/Media Download DTH Service -
Small dish on Roof, A Stand alone Box with One Tera Byte HDD and USB.
The PC has much Evolved, From XT to AT, then from 286 to 586, the
evolutionary trend continues. The Speed: GHz, Space: GB and Software:
Linux-XP, have grown rapidly. The other vital things Interface,
Networking and Power Consumption moved a bit slower. So some suggestions
on the New Desktop for Small Office and Home Standard, that is crucial
in the present computing scenario. Enterprise Level Hardware and Software can be extrapolated from this
idea for a SOHO. An Enterprise is like a SOHO Cluster. One big
Homogeneous Entity is unstable and unreliable. When small varied,
self-dependent entities collaborate to form an Enterprise, it is a
Cluster of SOHOs, which is a Reliable and Resilient Entity.
A Green solution could be New Desktop Computing Standard - The quiescent
losses in this is only the wifi server cube, which can serve 6 tablets
So if 6-12 people are using computers, many desktops need not be on.
Tablets, Laptops and Notebooks consume less power and run on batteries.
Thin Custom Notebook and Tablet Clients can use one OpenOffice on the
WiFi Application Server cube
Nomadic Computing - WebOS - 2004
SOHO Desktop Standard
The Desktop Home Computer is the Wireless Router, Power Server.
SMPS Power Supply runs Both on 230V-110V AC and 12-24 V DC.
Home Wifi Computer, Application and Web Server is just a Cube.