Tuesday, July 12, 2016

Ultra Sound Sender Detecter Diagram

I am a University Physics technical staff member and I am searching a Diagram and full detals about Ultra sound detecter (Sender & receiver & Detecter). It must be arround (Detecting range ) 1.2 MHz. This is for the student practical activities.

Pl help me if you have any information. This will be a gratefull help to the students for their studings.

Mail from PBG Sri Lanka

See an earlier post - Ultrasonic distance measurement if i find more it will be added here Ultrasound Have a look at all links below, that might help

Ultrasonic Sound

"Sounds in the range 20-100kHz are commonly used for communication and navigation by bats, dolphins, and some other species. Much higher frequencies, in the range 1-20 MHz, are used for medical ultrasound."

Ultra Sound Sensor

4QD-TEC: Ultrasonics: remote control and Intruder detector - These ultrasonic circuits are all quite old: my notes date them at mid-70s so ... The last circuit is an ultrasonic preamp with a twin T feedback to make it ...

Schematics Depot (tm) - ultrasonic switch circuit - The ultrasonic receiver circuit uses an ultrasonic receiver transducer to sense ultrasonic signals. It also uses a two-stage amplifier, a rectifier stage, ...

Silicon Chip Online - Circuit Notebook - Besides being used as a Bat Detector, the circuit could also be used as a simple tool to indicate frequency, to find tyre punctures (which emit ultrasound), ...

Ultrasonic (Ultrasound) Electronic Circuits - Ultrasonic (Ultrasound) Circuits


Sunday, July 10, 2016

Logic Analyzer on Computer

Title: Test circuit for Logic Analyzer - Message: I am a retired hobbyist. Source files needed.The following was submitted on March 8th, 2008 at 06:47AM (CST). Subject: delabs Schematic Source Request.  Circuit: del20006.pdf .
Mail from JL USA

Sorry for the late reply, Can you explain in detail your doubt or problem. Meanwhile Have a look at
these circuits

40MHz 32 Channel Logic Analyser It is a 32 Channel, 40Mhz, fully PC controlled TTL/CMOS logic analyser with internal/external triggering and trigger delay. Internal triggering is fully maskable (High/Low/Don't Care) on all 32 channels.

FPGA Based Logic Analyzer The project includes the actual analyzer in VHDL (for Spartan 3 FPGA) and a PC Software for the end user. The design employs a FPGA board that can be obtained easily.

Logic Analyzer on Computer

MiniLA - logic analyzer SW & HW.
MiniLA is a project of simple and cheap logic analyzer designed for amateur and semi-professional work.


I am interested in obtaining a copy of the file "Logic.zip" referred to in the article. PC-Based Logic Analyzer (below). The link to the file is not available. The file contains the software for the circuit described.

Reply from JL

Thursday, July 07, 2016

Understanding Transistor Power Dissipation

I like your page about current source circuit basic design. However, I still have Little confuse of the power dissipation calculation.

The max power dissipation of my circuit is 20.5V x 0.5A = 10.25W, but transistors I found are 2W power dissipation. But my input voltages is just varied from 18.0V to 20.5V only. Do you think the 2W power dissipation transistor is fine? Any help will be appreciated.

Mail From MT

When the Current source output is short circuited or connected to a low impedance load say 10 ohms, the full voltage of input 20V falls across the transistor but current is limited to 0.5A. which means the 2W transistor may Roast. The transistor when conducting, the watts is the volts across it and current thru it. Not your supply Voltage.

Power Electronics & Solar Energy

HeatSinks in Electronics

HeatSinks in Electronics - For all types of packages, there are heatsinks. They are mainly made of Black Anodized Aluminium. Aluminium is a good conductor of heat and Anodizing prevents any form of corrosion. Linear Regulated Supplies, RF Transmitters and Power Amplifiers have Devices that need heatsinks. Use Mica, Silpad, PolySulphone Pads for Electrical Isolation. HeatSink compound too.

Power Supplies Section

Design in such a way there is no short circuit or a a power resistor in source. But then efficiency drops. The best way is to use a switching supply design or keep the input voltage across transistor to a minimum.