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Single-Dual digital LED dice circuit – Circuit Schematic
Single-Dual digital LED dice circuit
By using two 4516 ICs, this circuit will simulate two dices playing game. ...
TTL Three - State Logic Probe PCB – Circuit Schematic
TTL Three - State Logic Probe PCB
A TTL logic probe is an indispensable tool for digital circuit troubleshooting. Various methods can be used to design a logic probe. The most common designs emp...
7 Segment Digital Clock Circuit Using IC 5314 PCB – Circuit Schematic
7 Segment Digital Clock Circuit Using IC 5314 PCB
This circuit diagram of digital clock uses six common anode seven segment displays to show the time. It needs neither micro controllers or PIC for it`s operatio...
MM5314N Driven Digital Clock Circuit – Circuit Schematic
MM5314N Driven Digital Clock Circuit
MM5314 a monolithic MOS integrated circuit that utilizes P-channel low threshold, enhancement mode and ion planted, depletion mode devices which has features su...
Quiz Circuit PCB – Circuit Schematic
Quiz Circuit PCB
I`ve had a few requests for a quiz circuit, so here is a 4 input design which can easily be modified. Maybe, I should write the application notes in the style o...
Fastest Finger First Indicator – Circuit Schematic
Fastest Finger First Indicator
Quiz-type game shows are increasingly becoming popular on television these days. In such games, fastest finger first indicators (FFFIs) are used to test the pla...
Flip-Flop Using CMOS NAND Gates – Circuit Schematic
Flip-Flop Using CMOS NAND Gates
Using just two NAND or inverter gates its possible to build a D type (or toggle`)‚ip-‚op with a push-button input. At power-up the output of gate N2 is at a...
simple digital counter by – Circuit Schematic
simple digital counter by
The basic digital circuits are Flip Flop and Counter, both are here. This circuit can be cascaded to make even a 6 digit event counter, even a simple frequency ...
switch debounce circuit – Circuit Schematic
switch debounce circuit
In most digital electronics projects that uses different kinds of switches, switch bounces are commonly encountered. These are extra glitches after the real swi...
simple magnitude comparator – Circuit Schematic
simple magnitude comparator
In designing logic circuit, it is sometimes necessary to compare values of two digital data. In this case, creating your own magnitude comparator can cause you ...
pull up and pull down resistor – Circuit Schematic
pull up and pull down resistor
Most of the beginners in digital electronics assume that the hanging input is a logic 0. Then, that`s a misconception. They are neutral state which can be a log...
electronic dice schematics – Circuit Schematic
electronic dice schematics
It is good idea to put this circuit in a box and mark/write each LED with number 1 to 6. Now, when switch S1 is pushed momentarily, any one of the 6 LEDs will g...
7 segment led counter – Circuit Schematic
7 segment led counter
This simple counter can be used to count pulses, as the basis for a customer counter (like you see at the doors of some stores), or for anything else that may b...
4011 dual led flasher – Circuit Schematic
4011 dual led flasher
This simple circuit uses NAND Gates to alternately flash two led`s. The two 47uF capacitors determine the flash frequency. It is a good idea to use a decoupling...
logic based digital queuing – Circuit Schematic
logic based digital queuing
This is a simplified design using a up/down counter IC, 74192. It is a versatile logic IC that has a separate pins for up and down count. Also, an RS latch is u...
latching relay circuit – Circuit Schematic
latching relay circuit
The circuit can also be triggered by logic ICs(TTL/CMOS) using proper interfacing method. I usually use another relay that serve as the trigger button when inte...
cmos toggle flip flop using laser pointer – Circuit Schematic
cmos toggle flip flop using laser pointer
The IR photo transistor Q1 (Radio Shack 276-145A) or similar is connected to the set input (pin 6). The photo transistor should be shielded from direct light so...
one of nine sequencer – Circuit Schematic
one of nine sequencer
This novel circuit uses a flashing LED as the clock input for a 4017 decade counter. Typical flashing LEDs (eg, DSE cat Z-4044) flash at about 2Hz so the output...
dicing with leds – Circuit Schematic
dicing with leds
Every self-respecting DIYer makes his own electronic dice with LEDs as spots. Then you don t have to throw the dice anymore just push the button. The electronic...
frequency doubler with 4011 – Circuit Schematic
frequency doubler with 4011
This frequency doubler uses one CMOS quad, two input NAND gate package type 4011. The frequency doubler proper consists of an inverter IC1B, two differentiating...