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LED runner with 74LS163 – Circuit Schematic
LED runner with 74LS163
This is a very simple circuit to build, just take note of the control pins on each IC, since both have enable inputs for counting or output, but once set you do...
Electronic Dice – Circuit Schematic
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...
Simple Digital Potentiometer with DS1869 – Circuit Schematic
Simple Digital Potentiometer with DS1869
The experimenter's pot is a solid state potentiometer using Dallas semiconductor?s DS1869 and National?s LM78L05 two electrolytic capacitor two small push butto...
Logic Probe with 74LS47 – Circuit Schematic
Logic Probe with 74LS47
This circuit is a Logic Probe. It indicates the logic state of the node of any TTL logic circuit. To do that, we have to supply the probe with the same power of...
Digital Stopwatch 0-60sec – Circuit Schematic
Digital Stopwatch 0-60sec
By using the same circuit of the Digital Stopwatch 0-99sec , we can add an AND gate, and transform the 0 ? 99sec stopwatch to a 0 ? 60sec stopwatch. We must fin...
Dual Precision Monostable Logic circuit (CD4538BC)
The logic diagram of the CD4538BC Dual Precision Monostable is shown in the following schematic diagram. This IC such a dual, precision monostable multivibrator...
High Speed Logic Astable Multivibrator (MC74HC04)
The MC74HC04 IC is a low cost CMOS Hex Inverter. I used this type mainly because, it is what I have, although you can use LS type but, with a little modificatio...
0 to 9 asynchronous decade counter 7490 display
The circuit is based on asynchronous decade counter 7490(IC2), a 7 segment display (D1), and a seven segment decoder/driver IC 7446 (IC1).The seven segment disp...
Digital Clock circuit with CMOS 4047
This circuit provides a digital square wave that can be viewed directly or used to drive other circuits. It used the CMOS 4047 Low-Power Monostable/Astable Mult...
Toggle Switch with 4013 – Circuit Schematic
Toggle Switch with 4013
This simple circuit will energize and de-energize a relay at the push of a button. Any type of momentary action push-to-make switch can be used. Pushing the but...
Digital Volume Control – Circuit Schematic
Digital Volume Control
Circuit of a digital volume control using six discrete ICs, including a 5V regulator, is presented. IC1 (555) is configured to function as astable flip-flop. It...
2 Input Pulses Frequency Comparator – Circuit Schematic
2 Input Pulses Frequency Comparator
This circuit uses a 74HCT74, 74HCT00, and a LM311 to form a frequency comparator. The two pulse trains are fed to two D-type flip-flops (triggered by the leadin...
Digital IC Tester for 74 series – Circuit Schematic
Digital IC Tester for 74 series
The chip tester verifies the functionality and timing of a variety of 7400 series integrated circuits. Students taking Digital Logic Design Lab, Use these chips...
Logic Pulser – Circuit Schematic
Logic Pulser
This LOGIC PULSER capable of delivering pulses of various compositions, to any type of circuit you wish to test. Basically it is designed to complement the LOG...
LOGIC DESIGNER – Circuit Schematic
LOGIC DESIGNER
The logic designer is filled with features. It would not be possible to list all the possible combinations of the unit as the various building blocks on the boa...
10 Step LED Circuit – Circuit Schematic
10 Step LED Circuit
Each time switch S1 is closed the count on the CD4017 advances by 1 step and the coresponding LED turns on. When the maximium count plus 1 is reached for each c...
Decimal to BCD Convertor Keypad – Circuit Schematic
Decimal to BCD Convertor Keypad
When any particular key is pressed, its value will appear in BCD form at the outputs (A, B, C & D). It will remain there until another key is pressed. The 1...
Decimal to BCD Convertor Keypad – Circuit Schematic
Decimal to BCD Convertor Keypad
When any particular key is pressed, its value will appear in BCD form at the outputs (A, B, C & D). It will remain there until another key is pressed. The 1...
Magic Wand Conjuring Trick – Circuit Schematic
Magic Wand Conjuring Trick
The operation of the circuit is fairly simple. Three AND logic gates of a 4081 CMOS IC are employed, with gates IC1a to IC1c being configured as a standard casc...
Magic Wand Conjuring Trick – Circuit Schematic
Magic Wand Conjuring Trick
The operation of the circuit is fairly simple. Three AND logic gates of a 4081 CMOS IC are employed, with gates IC1a to IC1c being configured as a standard casc...