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Digital-frequency-window – Circuit Schematic
Digital-frequency-window
This circuit detects frequency variation above or below preset limits. IC1 is a binary counter docked at FcLK· The outputs are comparea with switch preset v...
Digital-touch-on-off-switch – Circuit Schematic
Digital-touch-on-off-switch
Only one LED can be on when the circuit is at rest. Which LED is illuminated is determined by the touch pick-up that last had human contact. Pickup terminal ...
On-off-inverters – Circuit Schematic
On-off-inverters
Each time the switch closes, the voltage on Cl causes inverter A to change state, with positive feedback from inverter B. Resistor Rl delays the charging and...
Switch-debouncer – Circuit Schematic
Switch-debouncer
TTL inverter 74LS14 has an internal 16-Kohm, pull-up resistor that pulls the gate input high when the switch is open. As you close the switch, the 4.7uF capacit...
Square-wave-pulse-extractor – Circuit Schematic
Square-wave-pulse-extractor
This circuit traps a single positive pulse from a square-wave train. Following the rising edge of an input command, the pulse-out signal emits a replica of o...
Logic-pulser – Circuit Schematic
Logic-pulser
The pulser generates pulses at a user-selected frequency of 0.5 or 500 Hz, with a pulse width of about 5 ms. If the input to be pulsed is already being driven ...
Cmos-universal-logic-probe – Circuit Schematic
Cmos-universal-logic-probe
Only the CD4009AE hex buffer, two resistors, and two LEDs are required for a logic probe. CMOS logic probe features 10120 input impedance and covers 3 to 15 ...
Digital-logic-probe – Circuit Schematic
Digital-logic-probe
The probe relies on the power supply of the CUT (circuit-under-test). The input to the probe, at probe tip, is fed along two paths. One path flows to the clock...
Demultiplexer – Circuit Schematic
Demultiplexer
This circuit reconstructs and separates analog signals which have been time-division multiplexed. The conventional method, shown on the left, has several restr...
Two-level-multiplexer – Circuit Schematic
Two-level-multiplexer
When a large number of channels are multiplexed, the outputs of two or more multiplexers can be connected together and each multiplexer sequentially enabled. I...
Audible-logic-tester – Circuit Schematic
Audible-logic-tester
This tester provides an audible indication of the logic level of the signal presented to its input. A logic high is indicated by a high tone, a logic low is in...
3In1-test-set – Circuit Schematic
3In1-test-set
This circuit is designed around a 4049 hex inverter/buffer. Two inverters are used ina dual-frequency signal-injector circuit, another inverter is used as a lo...
Xor-gate-complementary-signals-generator – Circuit Schematic
Xor-gate-complementary-signals-generator
Some applications, such as driving three-state buffers for data multiplexers or for biphase clocks in high-speed systems, require complementary signals havin...
Non-integer-programmable-pulse-divider – Circuit Schematic
Non-integer-programmable-pulse-divider
The purpose of D-type flip-flop IC2 is to synchronize the input signal with the clock pulse. When the clock pulse changes from low to high and the input is hig...
Single-chip-frequency-doubler – Circuit Schematic
Single-chip-frequency-doubler
The frequency doubler uses only one !C. Like other doublers, this circuit uses both the rising and falling edges of the input signals to produce digital pulses...
Odd-number-counter-divider – Circuit Schematic
Odd-number-counter-divider
This circuit, shown symmetrically, divides an input by virtually any odd number. The circuit counts n + 1/2 clocks twice to achieve the desired divisor. By sel...
Divide-circuit – Circuit Schematic
Divide-circuit
An input signal drives both SN74 74 D-type flip-flops, which are positive edge-triggered devices. A low-to-high input signal transition triggers tbe A flip-flo...
Digital-frequency-doubler – Circuit Schematic
Digital-frequency-doubler
The circuit doubles tbe frequency of a digital signal by operating on botb signal edges. Each transition causes exclusive-OR gate IC1 to produce a pulse, which...
Noisy-signals-filter – Circuit Schematic
Noisy-signals-filter
This circuit filters noise, such as glitches and contact bounce, from digital signals. You can easily adjust the circuit for a wide range of noise frequencies...
Glitch-free-turbo-circuit – Circuit Schematic
Glitch-free-turbo-circuit
This simple circuit generates a dual-speed clock for personal computers. The circuit synchronizes your asynchronous switch inputs with the master clock to provi...