Digital Circuits

Digital circuits use a digital signal instead of analogue. Digital circuits are the basis of all digital units, for computers, mobile phones, and numerous other consumer products. Digital systems interface well with computers and are easy to control with software.It is often possible to add new features to a digital circuits without changing hardware, and to do this, just by changing software. Find from Analog to Digital / Digital to Analog converters, Logic Circuits Readouts and many more. 100s of digital circuits for every hobbyist, technician, student, and design professional. An nice reference tool which includes lots of digital circuits. look at these circuit ideas, some of them may need some modification if they are to work as advertised. Ideas along with pretty good descriptions for each circuit.

Readout Circuits	Display Circuits	Data Bus Circuits
Logic Circuits	Analog to Digital	Decoder Circuits
Digital to Analog	Data Logging

12-Bit dac with variable step size

The step size of the converter is variable by selection of the high order data bits. The first DAC, A, has a stable reference current supplied via the 10.24 V reference IC and Rl. R2 provides bias cancellation. As shown, only the first 4 MSB inputs are used, giving a step size of 225/256 2.048/16 = 0.127 mA. This current supplies the reference for DAC whose step size is then 0.1275/256 = 0.498 Âµ. Complementary voltage outputs are available for unipolar output and.....

Cmos logic probe

The logic probe can indicate four input states, as follows: floating inputâ€”all LEDs off..

Vacuum fluorescent display

This circuit uses the CA3207 sequence driver and CA3208 segment latch-driver in combination to drive display devices of up to 14 segments with up to 14 characters of display. ..

Logic probe yields three discrete states

The circuit uses a dual LED. When power is applied to the probe throughthe power leads, and the input is touched to a low level or ground, Ql is cut off. This will cause Q2 to conduct since the base is positive with respect to the emitter. With Ql cut off and Q2 conducting, the green diode of the dual LED will be forward biased, yielding a green output. Touching the probe tip to a high level will cause Ql and Q2 to complement, and the red diode will be forward biased,.....

4511B Common-Anode Display Driver Circuit

The use of a switching transistor (like a 2N2222 or 2N3904) allows use of the CD4511B with a common-anode display. should be chosen to provide about 1 mA to drive Ql and Rr should provide enough current to drive the display...

Light activated logic circuits

These circuits illustrate some of the common logic functions..

Carrier-Current Receiver For Data Transmission

This receiver consists of an input network amplifier IC7 FSK PLL detector ICG, and output am..

Digital transmission isolator

An optoelectronics device is used to couple a digital (TTL) signal to another system. The photodiode in the optocoupler drives an LM311 set up to produce a TTL compatible output...

Audible ttl probe

When the probe is in contact with a TTL low (0) the probe emits a low note. With a TTL high (1), a high note is emitted..

ResettableÂ·integrator

The low Rds and high peak current capability ofthe DG419 makes it ideal for discharging anÂ·integrator capacitor. A high logic input pulse disconnects the integrator from the analog input and discharges the capacitor. ..

Expanded scale meter

A bar graph driver IC LM314 drives anXED display. The LEDs may be separate or in a combined (integral) bar graph display. Calibration: With a precision meter be-tvveen pins 4 and 6 adjust Rl for voltage Vq of 1 20V. Apply 4.94V to pin 5, and adjust R4 until LED No. 5 iust lights. ..

Positive-peak-detector

This peak detector uses a CA3100 BiMOS op amp as a wide-band noninverting amplifier to provide essentially constant gain for a wide range of input frequencies. The IN914 clips the negative half of VfN (R4)/(R3) (R5). ..

Frequency Shift Keyer

Apply a signal to each differential amplifier input pair. When the gate voltage is changed from one extreme to the ot..

Digital Levels Scope Displays 2 Logic Signals On 1 Scope

Using this simple resistor circuit, you can trick your oscilloscope into displayin..

Logic Pulser Circuit

The logic pulser generates pulses at 500 Hz or 0.5 Hz. When the pulser`s.tip connects to an input that is already being driven high or low, the pulser senses thelogic state and automatically pulses the input..

Rf probe for vom

This probe makes possible relative measurements of rf voltages to 200 MHz on a 20,000 ohms-per-volt multimeter..

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 V range. ..

Inverse scaler

If a DAC is operated in the feedback loop of an operational amplifier, then the amplifier gain is inversely proportional to the input digital number or code to the DAC..

12-Bit-da-conversion-system

The front end of the DAC is configured differentially using dual eight-input IC multiplexer 1H6216 and three LM156 op amps. Following the differential amplifier is the programmable gain stage discussed earlier, with a low-pass filter on the output feeding the IH5110 sample and hold amplifier. The output of the IH5110 is connected to the comparator input, -input LM301, through the internallO-K!l feedback resistor of the 7541 multiplying dia converter. ..