sms based device control using at89s52 amp nokia 3310
I have completed this above mentioned project. People have had SMS contl on Siemens/Ericsson/and other phones but they have a modem on them, and comapratively s...
hacking rfid for fun
Interesting articles about reading/writing RFID proximity cards that we use foraccess to controlled areas. This all came about after a discussion with a colleag...
serial ir transmitter
This is essentially the simplest circuit with additional indicator LED`s and appropriate resistor values. The dotted line is to indicate that the IR LED is sepa...
tfds4500 infrared adapter serial
This electronic infrared adapter serial transceiver circuit is based on a TFDS4500 IC and can be used to transmit data from portable devices to a PC using IR an...
embedded ethernet client.
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1RE30 DATA TRANSMISSION USING LASER
Free-space optical (FSO) communication uses light as a medium to transmit data. We did communication between two computers using laser(without help of any exist...
gps voice interface circuitry
The yellow wires on the far right are temporary power connections; battery power enters through the contact studs in those large holes that press against the ra...
gps voice interface for wouxun kg uv3d circuit
Connect the Byonics TinyTrak 3+ GPS modem, the helmet earbud/mic, and the external battery pack to the Z-1A doesn`t work with the Wouxun. It`s all different: Be...
simple intercom circuit with
This is a 2-station simple intercom circuit build based on transistors part and using common 8R mini speakers. The speaker works as microphone and generate soun...
intercom circuit with transistors
The secret to preventing instability (motor-boating) with a high gain circuit like this is to power the speaker from a separate power supply! You can connect an...
rs232 with opto isolation
Even though i had isolation at the sensors and actuators to make doubly sure the PC also has been isolated. There are chips that are available for this purpose,...
differential to ttl convertor
The differential outputs are balanced and are designed to drive long lengths of coaxial cable, strip line, or twisted pair transmission lines with characteristi...
control upto 8 devices by sms
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lm1893 power line modem circuit
This is a circuit for an LM1893 power line modem circuit. This circuit is used to transfer information between remote location by using the power mains. This ci...
low cost intercom
This is a design circuit for intercom circuit. The circuit comprises a 3-stage resistor-capacitor coupled amplifier. When ring button S2 is pressed, the amplifi...
video switch for intercom system 4060
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ypbpr to rgb video converter circuit
The LT6552 is a video difference amplifier optimized for low voltage single supply operation. The LT6552 features 75MHz 3dB bandwidth, 600V/ µs slew rate, and ...
GPS USB Dev Board
You`ve probably heard about the CP210x USB ICs from Silicon Labs, now here`s an application that uses it. The CP2102 gives us 3V TTL to a VCP (virtual comm port...
GPS RS232 Dev Board
Once you discover how to setup an RS232 connection, it`s really just cut-and-paste for future projects. Please note this is a relatively compact SMD version of ...
keypad
The transceiver Yaesu FT2000 (as well as FT950 and FT450) supports 2 features: CW memory keyer and phone voice keyer. The keyers are operated from panel - small...