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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...
7-Segment Displays – Circuit Schematic
7-Segment Displays
The DE2 Board has eight 7-segment displays. These displays are arranged into two pairs and a group of four, with the intent of displaying numbers of various siz...
LEDs and Switches – Circuit Schematic
LEDs and Switches
The DE2 board provides four pushbutton switches. Each of these switches is debounced using a Schmitt Trigger circuit, as indicated in Figure 1. The four outputs...
Coin Toss Circuit – Circuit Schematic
Coin Toss Circuit
In this project you will build a coin toss circuit. It has three sections: a square-wave oscillator, a JK flip flop, and two LEDs (red & green). It uses CMOS di...
Woodstock HP-21 HP-25 – Circuit Schematic
Woodstock HP-21 HP-25
The machine used a 12 digit display (8 LED anodes scanned by an Anode driver, and 12 `digits` scanned by a Cathode driver, the latter being used also to scan th...
code switching EPROM circuit – Circuit Schematic
code switching EPROM circuit
For this article, we will use the 128K EPROM (27C128 used in the 1986 to 1989 IROC-Zs with the 1227165 ECMs) as the basis for our discussion. This purpose of th...
CD4052BMS – Circuit Schematic
CD4052BMS
CD4051BMS, CD4052BMS and CD4053BMS analog multiplexers/ demultiplexers are digitally controlled analog switches having low ON impedance and very low OFF leakage...
IC Up/Down Counter – Circuit Schematic
IC Up/Down Counter
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IC Excess-3 to Decimal Encoder Chip – Circuit Schematic
IC Excess-3 to Decimal Encoder Chip
Note that the function diagram for either the 5443 and 5444 are identical, assuming a 16-pin dual In-line package. The difference resided in the internal connec...
BCD to Seven Segment Decoder IC description – Circuit Schematic
BCD to Seven Segment Decoder IC description
Note how the output letters of the integrated circuit [Output A] match with the Diode letters in the 7-Segment LED above. Each IC output corresponds to a partic...
IC Adder Chip – Circuit Schematic
IC Adder Chip
A 4-bit adder which adds two four bit binary numbers with a Carry in line. The diagram above show the logic gate schematic of a 4-bit adder. A full adder take i...
IC 8-Bit Latch Chip – Circuit Schematic
IC 8-Bit Latch Chip
The 74ALS996 part is shown which corresponds to the commercial temperature range, but the 54ALS996 may also be available which would operate up to the military ...
IC Shift Register Chip – Circuit Schematic
IC Shift Register Chip
A shift register works by shifting data to the right with each clock pulse. Regardless of if the data is loaded in all at once via parallel load or one bit at a...
IC Encoder Chip – Circuit Schematic
IC Encoder Chip
This is not a complex function and could be easily coded into a PLD or FPGA. However implementing this function into a small PLD might just use up most of the c...
4-bit Decade Counter Description IC Up/Down Counter – Circuit Schematic
4-bit Decade Counter Description IC Up/Down Counter
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IC Multiplexers – Circuit Schematic
IC Multiplexers
I`m not all that clear of the difference between a data selector and a multiplexer. Although the designs I`ve been involved in stopped using small scale ICs in ...
IC Magnitude Comparators – Circuit Schematic
IC Magnitude Comparators
This Magnitude Comparator can be used perform comparisons of two 8-bit binary or BCD words. The output provides both a P equals Q function or P greater than Q f...
Switch Debounce – Circuit Schematic
Switch Debounce
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Gray Code Circuit – Circuit Schematic
Gray Code Circuit
Gray Code. A positional binary number notation in which any two numbers whose difference is one is represented by expressions that are the same except in one pl...
BCD to Decimal Converter Circuit – Circuit Schematic
BCD to Decimal Converter Circuit
Binary Coded Decimal is a number system that only counts from 0 to 9 and then repeats. The table below shows the conversion between the different numbering syst...