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19 LED Clock circuit – Circuit Schematic
19 LED Clock circuit
The clock circuit above uses seven ICs and 19 LEDs to indicate binary coded decimal time. The LEDs can be arranged (as shown in example above) so that each hori...
Electronic potentiometer schematic – Circuit Schematic
Electronic potentiometer schematic
Electronic potentiometer using a standard CMOS logic and analog multiplexers. Pot have low distortion (0.005% less at 1 V rms) and is it easy for beginers to Un...
Data Switch with LED – Circuit Schematic
Data Switch with LED
Just to prove that transistors can also be useful in logic situations; this is a data latch and indicator which also is a data switch and has a bidirectional in...
Optical toggle switch with 4027 – Circuit Schematic
Optical toggle switch with 4027
Using dual flip-flop IC CD4027 employ a 555 based monostable circuit to supply input clock pulses. The circuit described here obviates this requirement. One of ...
Quiz game schematic – Circuit Schematic
Quiz game schematic
This jam circuit can be used in quiz contests wherein any par- ticipant who presses his button (switch) before the other contestants, gets the first chance to a...
Scoring Game circuit – Circuit Schematic
Scoring Game circuit
You can play this game alone or with your friends. The circuit comprises a timer IC, two decade counters and a display driver along with a 7-segment display. Th...
START-STOP circuit – Circuit Schematic
START-STOP circuit
We are going to build a START-STOP drive (as commonly found in professional tools), that is a circuit with one switch to run the output (an LED in this case) an...
7-segment display with encoder – Circuit Schematic
7-segment display with encoder
This design explains how to use an encoder to set the number shown by a 7-segment display. Turn the knob clockwise to increment the number, turn it counterclock...
Electronic dice with 7 LED – Circuit Schematic
Electronic dice with 7 LED
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 be...
Digital Up / Down Counter – Circuit Schematic
Digital Up / Down Counter
This Circuit uses a CD40110BE, Up/Down Counter IC's. This IC is able to Source Each Segment with 25 mA, Giving a Very Nice Bright Display. The 7 Segment Display...
Digital Clock – Circuit Schematic
Digital Clock
The digital clock of circuit, has as base one IC, the MM5314N, in which are contained all the circuits that need. The IC1 collaborates with six Display of commo...
Frequency Divider – Circuit Schematic
Frequency Divider
This is a classic divider of frequency via two. It is achieved with a classic circuit T-flipFlop, round IC1 [ 4011 ]. In the circuit, the frequency of network,...
Frequency doubler II – Circuit Schematic
Frequency doubler II
This frequency doubler uses one CMOS quad, two input NAND gate package type 4011. The frequency doubler proper consists of an inverter IC1B, two differentiatin...
Frequency doubler – Circuit Schematic
Frequency doubler
This frequency doubler using a single 4069 hex inverter IC, a frequency doubler can be constructed to give an output pulse train whose frequency is twice that o...
Frequency Divider – Circuit Schematic
Frequency Divider
This circuit will divide the frequency of a TTL compatible square wave signal by a factor from 0 to 999. The circuit comprises three decade counters IC1 to IC3 ...
Electronic Switch ON-OFF – Circuit Schematic
Electronic Switch ON-OFF
Here we have three choices, with which we can make electronic switches that use our touch or pressing (push button). We thus exploit the very big resistance of ...
CMOS Combination lock – Circuit Schematic
CMOS Combination lock
his Electronic Lock circuit is not only simple but it is also very good. It can easily be configured to provide either momentary or continuous output. Key seque...
Audible Logic Probe with LM339 – Circuit Schematic
Audible Logic Probe with LM339
When testing circuits with a logic probe, it is sometimes difficult to watch the LEDS on the probe to determine the logic state. With this probe the logic state...
LED Counter with IC 4017 – Circuit Schematic
LED Counter with IC 4017
The circuit presented this month is a basic configuration of the very versatile 4017 IC Chip. In the most common use of the IC, it will turn on 10 separate outp...
Logic Checker – Circuit Schematic
Logic Checker
Simplified logic checker. Logic voltage levels have the ability to display LED (Of course I (^_^;)." H "in the LED is green," L "and red LED lights, and so both...