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6V Ultra-Bright LED Chaser - This is a spectacular but completely useless project.
It lights Ultra-Bright LEDs in a sequence and each LED flashes brightly very briefly.
The LEDs light-up going around and around since they are mounted in a circle (on a
CD), then they pause ...(electronic design added 6/07) |
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Another Game Show Timer - Scroll down to find this circuit. Here is a
somewhat more complex version that uses easily found bipolar transistors. Note that it
requires only two wires between stations and base and those wires can be connected
anywhere on the "buss". ….(added 03/03/03) |
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Archery Timer - (circuit / schematic added 6/05) |
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Bingo! (on your TV) - This design is based on the video DVM and cronograph design.
It supports color, so numbers not yet drawn (all but 1 and 87 in the picture on the
left) are displayed in green and the others in white. White lines are
intentional, according to the Italian rules the drawer itself takes place in game
choosing one of the six regions....(DDED 05/06) |
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Birthday Heart - This circuit was made for my wife's birthday. It is capable of
flashing five strings of LED's with different frequencies. It also has a connector for
an 8 Ohm loudspeaker and two connectors for the small PCB's that are contained in
musical greeting cards. In this way the circuit will play alternatingly two room
filling tunes at regular time intervals. After a w....(electronic design added 6/07) |
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Burger Time Arcade Game - (electronic circuit added 04/05) |
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Cat Toy - The PIC12F675 is small in size and low in power. It lends itself to some
really off-beat uses..... (electronic design added 10/06) |
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Christmas Star - This circuit can be used to construct an attractive Christmas
Star. When we switch on this circuit, the brightness of lamp L1 gradually increases.
When it reaches the maximum brightness level, the brightness starts decreasing
gradually. And when it reaches the minimum brightness level, it again increases
automatically. This cycle repeats. The increase and decrease of brightness of bulb L1
depends on the charging and discharging of capacitor C3. When the output of IC1 is
high, capacitor C3 starts discharging and consequently the brightness of lamp L1
decreases. IC2 ….(circuit design added 03/08) |
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Circuit Improves Further on First Event Detector - 06/27/02 EDN-Design Ideas: The
circuits in Figure 1have certain advantages over those in a previous Design Idea
(Reference 1). The first-event detector with autoreset (Figure 1a)consists of N sets
of monostable multivibrators, using 4001 logic circuits with LEDs attached. After any
player (1 through N)presses a pushbutton, the corresponding monostable
multivibrator.....(design idea added 2/05) |
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Circuit Improves on First Event Detection - 08/16/01 EDN-Design Ideas: The
circuits in Figure 1 and Figure 2 exhibit certain advantages over the circuit shown in
the Design Idea in EDN , "Circuit detects first event," May 3, 01 EDN-Design Ideas, pg
89. The n-player first-event-detection circuit offers several improvements: It has
fewer passive components. It needs only n diodes instead of (n2+n)/2 for three or more
players.....(design idea added 1/05) |
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Coin Tosser - The UJT transistor Q1 can be replaced with a NTE6409 or ECG6409.
At the press of S1 the oscillator starts and runs the clock on pin 14 of the CD4017
decade counter at a time determined by R1 and C1. During that time both LED's
will flash back and forth until the oscillator stops and either the red or green led
will be lit. The values shown are for working with 9 volts and none of the parts
are critical. (Tony van Roon's electronic design added 2/06) |
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Combinational Conjuring Trick - The simple circuit of Fig.1 emulates a similar
conjuring trick which sells for hundreds of Pounds. The trick seems to do the
almost-impossible from an electronic point of view, let alone from the point of view
of common sense. It consists of a bank of three on-off switches (S19-S21), which
have three switch covers, each of a different colour. These switch a bank of three
lightbulbs(schematic / circuit design added 9/02) |
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Conjuring Trick - (schematic / circuit design added 9/02) |
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Connecting Sega 3d Glasses to a PC Serial Port - (electronic schematic added 703) |
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Convert Atari-style Joystick to PC Joystick Port - Some games are easier to play
with digital joystick instead of analogue type. Unfortunately PC has only analogue
joystick connector, which makes it impossible to connect normal digital joystick to
it. But with a little adapter circuit, it is possible to use Atari style digital
joystick with IBM PC joystick interface. The circuit adapts the joystick connectors
and converts digital joystick movement signals to analogue signals…(added 05/05/05) |
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Co-Ordinator - A games of skill & patience. This project combines some of
the components and building blocks we have covered in the courses in this e-magazine.
It's a game of skill that tests your reaction-time and patience. Patience,
because a certain condition appears on the indicator LEDs, only every few seconds and
it corresponds to them both being OFF. (electronic circuit added 04/09) |
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Courtesy Light - 15 seconds delayed switch-off for220-Volt AC lamp, a good idea
for bedroom lamps (added 11/06) |
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Cuckoo sound Generator - This circuit generates a two-tone effect very much alike
the cuckoo sound. It can be used for door-bells or other purposes thanks to a built-in
audio amplifier and loudspeaker. Used as a sound effect generator it can be
connected to external amplifiers, tape recorders etc. In this case, the built-in audio
amplifier and loudspeaker may be omitted and the output taken from C8 and
ground.….(circuit design added 08/08) |
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Dig Dug Arcade Game - (electronic circuit added 04/05) |
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Digital Game Show Timer - Scroll down to find this circuit. Using only two
CMOS IC packages, this game show buzzer performs well enough to be on TV! The first
contestant to press his button locks out the other two contestants. The design is
completely asynchronous and "fair". Other logic families will also work and any
appropriate power supply is fine. For simplicity, a single-chime doorbell is used for
the aural indicator….(added 03/03/03) |
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DIT shutterglasses Controller - (circuit added 2/07) |
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Dreamcast PC serial adapter - (schematic / circuit added 2/07) |
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E.S.P. Conjuring Trick - The design uses tactile sense (or rather, neural sense)
to reveal the contents of a box. The box contains 4 shapes, as in a child's shape
sorter. The conjurer asks a person to secretly remove from the box any shape or shapes
of his or her choosing, then to close the box, and to place a silk over it. The
conjurer then rests a hand on the silk, and through "extra-sensory powers" reveals the
contents of the box..... (electronic circuit added 4/05) |
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Electronic coin tosser - (diagram added 1/07) |
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Electronic Dice - The 555 timer IC is connected for Astable Operation, the clock
pulses are fed to the 4017 IC via the 10K resistor. The 4017 is a 10 stage counter,
output 6 (pin 5) is connected to RESET (pin 15), thus giving us a 6 stage counter ,
outputs 0 to 5. 6 of the LEDs are connected as 3 pairs, thus requiring 4 different
signals, these signals come from the 4 transistors, which in turn ....(added 04/05/06) |
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Electronic Dice (van den bergh) - This circuit simulates two dice. It is build
around a PIC 16c84 microcontroller and runs from a 9V battery. Pushing the right
button "throws" the dice and sounds a short beep to alert the other players. It is
possible to choose between one and two dice with the left button. After five seconds
the display blanks (except for a flashing decimal point) to save battery power.
Pushing one of the buttons brings the display back up. The size of the PCB is
3.2"x3.2" (circuit design added 6/07) |
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Electronic Dice electronickits - (schematic added 10/06) |
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Electronic Dice from nutchip - This project takes advantage from -HOLD input,
which is connected to push-button P1. As long as the -HOLD input is low, truth table's
timeouts have no effect because this input serves to disable any state change provoked
by timers. The effect is to freeze Nutchip's counting, stopping the LEDs on the number
they were displaying at the time of key release. Notably, we could have used -STOP
input to get the same effect, although this does not apply as a general rule, there
are occasions where these two pins behave differently....(electronic design added
6/07) |
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Electronic Dice with your Computer - (electronic design added 6/07) |
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Electronic Jam - (electronic Circuit / Schematic added 10/04) |
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Electronic NiCad Glow Plug Driver - (diagram added 2/07) |
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Electronic Roulette Wheel - A novel circuit that duplicates the function of a
10-slot Casino-style Roulette Wheel. Features a "coast-down" clock generator, to add
realism. (circuit design added 7/06) |
