Wednesday, February 25, 2009

Hobby Projects

3V Battery powered
Beeps after a fixed minutes delay
Beeps when hears your whistle
A gadget suitable for key-holders, games etc.
Dual-purpose test-instrument
Very simple circuitry, 1.5V Battery-operated
Short-range 35KHz operation, single-channel units
Simple circuitry, no outer antennas required
Easily adjustable, high sensitivity circuit
Minimum parts counting
Automatic switch-on when it gets dark
6V or 3V battery operation
Four timing controls - 12V supply
Suitable for Halloween or Christmas props
17 LEDs in four groups bar-mode sequence
Suitable for shop-windows animation etc.
LED goes to steady state after a preset number of flashes
Two simple, wide supply range operating circuits
Special design for shop-windows animation
Useful for many types of touch controls
Three circuit options
Can be synchronized to Christmas tree flashing lights
LED sequencer: follows the rhythm of music or speech
9V Battery-operated portable unit
Two strips of LEDs fading in a complementary manner
9V Battery-operated portable unit
Very simple, versatile modular design
No limits to the number of modules used in the ring
Agreeable, very close sound imitation
Suitable for sound effects, door-bells etc.
Switch-mode driven 1.5V bulbs
Portable unit - 3V battery supply
Especially designed for Christmas tree lamps
Replaces old thermally-activated switches
Simple photo-sensitive circuit
3V battery supply
230 or 115 Vac mains operated
Very simple circuitry
Tests transistors and diodes for polarity
Simple circuitry - 9V Battery operation
Simple circuitry - No ICs
12V Battery operation
Mimics the now discontinued LM3909 IC
Can be adapted to a wide variety of applications
Two LED-eyes follow the rhythm of music or speech
3V Battery-operated device suitable for pins or badges
Suitable for battery-operated devices
Fixed 35 minutes delay
Indicates the basic integrity of a printed board
Self-powered - 3 to 30V range
Acoustic check of transistor and diode junctions
Also suitable as continuity tester
Signals when an on-circuit battery is exhausted
5V to 12V operating voltage
Max. range: 9.950 meters with two digits
Slip it in pants' pocket for walking and jogging
Double tone Police sound
Single tone old ambulance sound
Small, portable, anti-bag-snatching unit
Also suitable for doors and windows control
Voltage range: 0.7 - 24V
Current limiting range: 50mA - 2A
Minimum parts counting - Improved version
3V battery operation
Ideal to operate 3 to 24V DC existing on-circuit lamps
LED operation is also possible
Astonishing effect
4.5V supply
Flashing 13 LED unit, 3V supply
Also suitable for jogger/walkers
Funny gadget for props and jokes
5 - 12V Battery operation
Accurate, finger-operated portable unit
3 - 12V Battery supply
LED or bulb switch off with a puff
Funny gadget - 3V Battery supply
Simple add-on for a single-rail supply
±2.5V to ±15V output
Three channels - Three operating modes
Completely ac-insulated circuit board

Sunday, February 22, 2009

College Projects

Based on electromagnetic-field radiation

Place it under the pillow - Built-in timer

Detects the amount of salt contained in liquid foods

Three-level LED indicator

Particularly suitable for cellulitis treatment

3V battery supply, portable set

Agreeable, relaxing effect, helping to fall asleep

Small portable unit, 3V battery powered

Improved version of the popular circuit

Increased output voltage - More complex output wave forms

Current flows through clips placed on the earlobes

Output current adjustable from 80 to 600 microAmperes

Six timing positions suited to different skin types

Timing affected by sunlight intensity

Can be fitted into a packet of cigarettes

Also suitable as Fuzz-box

Stand-alone, 9V battery powered unit

Three-level input selector, three-band tone control

All-FET version of the celebrated valve guitar preamp

Can be easily modified to Marshall Tone Controls specs

All-FET design

Valve-like distortion behavior

300Hz, 1KHz, 3KHz "output stable" test equipment tool

9V battery powered portable unit

10W Old-Style ultra-compact Combo

Two inputs - Overdrive Treble-enhancement

Bass, Treble, Harmonic modifier and Brightness controls

Output power: 40W into 8 Ohm and 60W into 4 Ohm loads

Dot-mode three-LED display

9V battery powered portable unit

Four shape-controls portable unit

Wide variety of output waveforms

Precision Frequency generator 1 to 999 Hz

Precision Metronome 1 to 999 beats per minute

Linear scale Small size

40 to 208 beats per minute

Three Lamp-Channels Output

Built-in Electret Microphone

Low-cut and Bass controls

Output power: 40W into 8 Ohm and 60W into 4 Ohm loads

Project Ideas - Engineering, Science, Electronics

Constant current circuitry

12V Battery operation

Wireless portable unit

Adaptable with most internal combustion engine vehicles

Three LEDs signal bumper-barrier distance

Infra-red operation, indoor use

Bar-mode LED-cluster sequencer

Can drive up to 16 clusters

Suitable for alerting purposes

Drives 12V Car bulbs

Monitors battery voltage

Three-LED Display

Four-LED left and right sequence

Particularly suited to motorcycles

Three-step beeps signal bumper-barrier distance

Infra-red operation, indoor use

Pushbutton activated

Very simple circuitry

High Quality, Discrete Components Design

Input and Tone Control Modules

Simple circuitry suitable for moving-magnet cartridges

Passive high-frequency equalization

High Quality, simple design

20 to 30V supply

Simple add-on module

Switchable "Control-flat" option

High headroom input circuitry

9V Battery powered

Including Preamp, Tone Controls and Regulated dc PS

18 Watt into 8 Ohm - 30W into 4 Ohm loads

High Quality very simple unit

No need for a preamplifier

High Quality simple design

No need for a preamplifier

High Quality, powerful unit: 90W into 4 Ohm

Also suited as guitar or bass amplifier

High Quality unit

No need for a preamplifier

3V Battery powered

High Performance unit

400mW RMS into 32 Ohm load

Single-rail Supply - Optional Tilt Control

Low distortion Class-B circuitry

6V Battery Supply

High Quality, very simple design

No need for a preamplifier

Designed for self-powered 8, 4 & 2 Ohm loudspeakers

Bass-boost switch

Behaves like a one-valve operated amplifier

Simple circuitry - No cross-over distortion

High-quality modular design

9V Battery powered - Very low current drawing

Suitable for tandem bicycles and motor cycles

Connects to iPod and similar MP3 audio players

Small portable device - 9V battery operation

Three high/low-sensitivity switchable inputs

High Quality One-IC unit

Low current consumption

Small portable device - 6V battery operation

Suitable for teachers, lecturers, tourists' guides etc.

Detects clipping in preamp stages, mixers, amplifiers etc.

Single LED display - 9V Battery supply unit

Battery-operated 3 LED display

Simply connect it to loudspeaker output

Useful to monitor audio power delivered to loudspeakers

No power supply - no setup required

Measures 10mV to 50Volt RMS in eight ranges

Simply connect to your Avo-meter set @ 50µA range

Suitable for home-cinema setup

9 Volt operated portable unit

Simple circuitry, low distortion, battery operated

Variable, low impedance output up to 1V RMS

Generates very low-distortion sine waves up to 1V RMS

No thermistors required - No settling time

Three switchable frequencies: 100Hz, 1KHz, 10KHz

1.5V battery operated, minimum parts counting

Converts sine to square waves without a power-source

Useful as a test instrument for audio purposes

Turns-off your amplifier when idle for 15 minutes

Fed by amplifier tape-output

Useful to listen in faint sounds

1.5V Battery operation

No complex switching required

Simple circuitry, 6-12V supply

Voice manipulation device specially intended for props

9V Battery operation

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