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Digital Mixer – Circuit Schematic
Digital Mixer
A simple digital mixer, based on two dual-Schmitt triggers (4583B) and three exclusive-OR gates, uses an RC time-delay circui...
Fast Binary Adding Circuits – Circuit Schematic
Fast Binary Adding Circuits
Some circuits that add binary numbers have problems with time delay caused by carry propagation. This has been ...
Logic-Level Translators – Circuit Schematic
Logic-Level Translators
The HA-4900 series comparators can be used as versatile logic interface devices, as shown in these circuits. Negati...
Keyboard Matrix Interface – Circuit Schematic
Keyboard Matrix Interface
Keyboards can be slotted into two categories, at least as far as the manner that the switches are connected is co...
Versatile One-Shot Cpu Interface – Circuit Schematic
Versatile One-Shot Cpu Interface
Process-control applications often require a monostable multivibrator (one-shot) with a pulse width that c...
Electronic Dice – Circuit Schematic
Electronic Dice
When SI is pressed, counter U2 is driven by oscillator U1A/U1B and the count (0 through 6) is read on DISP1. Rl and CI dete...
Keyless Lock – Circuit Schematic
Keyless Lock
The circuit uses a four-bit latch (Ul). What makes the circuit sequential is that the set input of the first bit latch is tied...
Divide-By-N + 1/2 Circuit – Circuit Schematic
Divide-By-N + 1/2 Circuit
This circuit, instead of dividing by an integer, divides the input signal by +1/2. With the feedback connections ...
1Ghz Divide-By-N Counter – Circuit Schematic
1Ghz Divide-By-N Counter
Counter speeds for CMOS- and TTL-programmable counters are limited to under 100 MHz. ECL-type devices can approach...
Divide-By-2-Or-3 Circuit – Circuit Schematic
Divide-By-2-Or-3 Circuit
This circuit produces a symmetrical waveform when dividing by either 2 or 3. The Divide Select input controls the ...
Divide-By-Odd-Number Counter – Circuit Schematic
Divide-By-Odd-Number Counter
This circuit symmetrically divides an input by virtually any odd number. The circuit contains n + 1h clocks tw...
Programmable Frequency Divider – Circuit Schematic
Programmable Frequency Divider
This divider uses a variable-length shift register, a type-D flip-flop, and an inverter. The clock feeds the...
Clock Input Frequency Divider – Circuit Schematic
Clock Input Frequency Divider
1. THE INPUT CLOCK frequency fed into this circuit is divided by 2n-l. The circuit consists of clocked flip-...
Deglitcher – Circuit Schematic
Deglitcher
Glitch has been a universal slang expression among electronics people for an unwanted transient condition. In D/A converters, th...
Flip-Flop Debouncer Switch – Circuit Schematic
Flip-Flop Debouncer Switch
Although this circuit uses a 74HC74, any CMOS variant of this flip-flop will work. IC1A acts as a true/ compleme...
Xor Gate – Circuit Schematic
Xor Gate
Inverting the negative-going input transactions allows the counter to count both positive- and negative-going edges. The XOR gate ...
Switch Debouncer With Auto Repeat – Circuit Schematic
Switch Debouncer With Auto Repeat
This circuit produces an output pulse when SW1 (pushbutton) is depressed. It also becomes a hysteresis ga...
Switch Debouncer – Circuit Schematic
Switch Debouncer
Using a 7473 JK flip-flop U1A connected as a monostable to drive U1B, as a switch debouncer. The circuit is self-clearing ...
Bit Grabber – Circuit Schematic
Bit Grabber
When the user set character (D0 through D7) from a computer matches the character programmed on S1A through S1H, the output fro...
Simple-window-detector – Circuit Schematic
Simple-window-detector
This simple window detector uses only half of a 7400 quad NAND gate plus four resistors, chosen so that the voltage at point A exc.,eds the voltage at point B ...