Meter Counter Circuits
This self-starting fixed-frequency oscillator circuit gives excellent frequency stability. R1 and C 1 comprise the frequency-determining network, while R2 provides the regenerative feedback. Diode D 1 enhances the stability by compensating for the difference between VaH and VsurrLYÂ·
Capacitor C1 is charged through timing resistor R1 when the clock output is high. When C1 reaches the upper threshold voltage, the output signal decreases, and then C1 discharges through R1 until its voltage reaches the lower threshold point. When this happens, the output increases again and the cycle repeats itself. Using the parts values...
This free-running TTL square-wave oscillator has a variable frequency output over a 20:1 range or better through use of four of the six inverters in an SN7404 chip and the additional components shown. Frequency of oscillation is determined by the capacitor and the settings of potentiometers R2 and R4; the first pot controls width Tl and the...
The 20-MHz clock phase-locks to Apple"s Mac II 10-MHz NuBus clock. It uses a simple, inexpensive CMOS circuitry to generate 10-and 20-MHz square waves. The output duty cycle settings are insensitive to Vee variations. The input to the circuit is a NuBus clock signal with specifications that call for a 75 percent duty cycle at 10 MHz-a square...
This simple circuit generates a dual-speed clock for personal computers. The circuit synchronizes your asynchronous switch inputs with the master clock to provide glitch-free transitions from one clock speed to the other. The dual-speed clock allows some programs to run at the higher clock speed in order to execute more quickly. Other programs-...
Clock Input Frequency Divider
1. THE INPUT CLOCK frequency fed into this circuit is divided by 2n-l. The circuit consists of clocked flip-
1Hz clock signal generator circuit
1Hz clock signal generator circuit It shows a sophisticated l llz clock signal generating circuit. Can be used for digital clock and timing circuits: The circuit consists of 14
0-60sec start-stop timer with 555
This timer is ideal for small aplications. Due to its simple structure, its usage and nevertheless its universal character, this mini timer is usable in the most current applications needing time intervals, from some seconds through approximately 60 minutes. By simple modifications it is possible to adjust the maximum time and the timing scale,...
LED digital clock language timekeeping circuit
General Dynamic LED digital clock have no timekeeping function, just add here a simple circuit it can bring the whole point timekeeping function.
Clock synchronization circuit diagram
The circuit generates a clock synchronized with the pulse width of two clock pulses, a random pulse width from the input pulse width of the clock pulse five times.
32kHz clock oscillator circuit
32kHz clock oscillator transistor Tun digital path, the clock circuit is indispensable, as shown in FIG. 32 kHz crystal clock oscillator is
Cheap precision digital clock time base oscillation circuit
As shown using a cheap CD4060 and 32768Hz crystal to produce highly accurate output 60 pulses per second clock source. The principle is 32768Hz pulse after CD4060 divider output
Analog electronic clock the whole point of the trigger signal to obtain
Analog electronic clock the whole point of the trigger signal to obtain
Clock synchronization oscillator circuit
As illustrated, 555 and R1, R2, C1 composition controlled multivibrator, its oscillation frequency in addition to the RC time constant related to, but also by the control termi
RC clock signal generating circuit
As shown in the clock signal generating circuit as RC, which applies to most of the TTL system. This circuit requires only a 6-inverter set of circuit SN7401 three inverters. T
A decorative quartz voice packet clock circuit
BGl, BG2 composition directly coupled amplifier, BG, BG4 is composed of monostable trigger circuit, without receiving prior to the trigger signal, BG3 saturated conduction, BG4
External circuit configuration CPU clock circuit
Clock oscillator is typically used digital signal processing circuit and a microprocessor circuit (digital signal processing circuit is a microprocessor). Digital signal transm
Clock/Calendar/Alarm with ATtiny12
This is the timekeeping test circuit. It includes a one-transistor circuit to switch in the 5V power supply when present and drop back to the 3v battery the rest of the time. That loop of blue wire-wrapping wire is a lariat used to quickly and easily pull the chip out of the socket during development without damage and without having to reach...
7 Segment LED Counter
This simple counter can be used to count pulses, as the basis for a customer counter (like you see at the doors of some stores), or for anything else that may be counted. The circuit accepts any TTL compatible logic signal, and can be expanded easily (see Notes).
Propeller Clock Mechanically Scanned LED Clock
A motor spins the "propeller", and a small microprocessor keeps track of time and changes the pattern on seven LEDs with exact timing to simulate a 7 by 30 array of LEDs. It is an illusion, but it works nicely.
Building an Intel 8008 Computer "Clock"
About every year I design and build a new clock. This years project is a clock based on an Intel 8008 first generation 8 bit microprocessor. Because it is a fairly unique project Im putting more effort into the documentation. Im also totally opening the design, hardware and software, to anyone wanting to learn more about the 8008.
Circuit allows high-speed clock multiplication
In theory, synchronous clock multiplication is an easy task. A simple PLL with two digital dividersone inserted just after the VCO (voltage-controlled oscillator) and the second one placed directly at the input of the phase detectormay do the job. The flexibility of such a configuration allows for clock multiplication by any rational number.
Clock-recovery scheme suits low-SNR systems
A clock-recovery architecture can operate with NRZ digital signals, even at low SNRs. A clock-recovery subsystem is based on a PLL comprising a phase comparator, a loop filter, and a voltage-controlled oscillator (VCO).
Crosstalk on the Clock
What is the effect of crosstalk from the digital data signals into the clock signal of a data-conversion system? This is a more obscure problem than crosstalk from digital bits into the analog signal path, which was the subject discussed in the previous article: Part 1 of this series, Effects of Digital Crosstalk in Data Converters.
Delay line has wide duty-cycle range
Today`s digital delay lines can process pulses no shorter than their delay times, and that restriction confines the devices to applications in which the duty cycle remains near 50%. A limited range of available delays (2 to 100 nsec per tap) further limits their use. Longer delay is available with one-shot multivibrators of standard...
Gated clock has duty-cycle control
The circuit in Figure 1 produces clock pulses with variable duty cycle from a gated clock. The output of the circuit, pulse, is always 180° out of phase with the clock input. When the delay-logic elements, IC5 and IC7, have the same propagation delays, the duty cycle of the circuit`s output is 50%. The circuit produces gated clock pulses when...
Because of the nixie-tube is a gas tube, it requires relatively high-voltage supply. Judging from archives, from 180 to 300 volts are used for supply voltage. In this project, 270 volts from rectified 100V line voltage directly is used. It is very simple but whole of the circuit is not insurated from the power line, never touch any part of the...
Pacer clock saves subroutine calls
This Design Idea outlines an easy-to-implement time-delay routine that requires no subroutine calls and thus avoids possible stack-overflow problems (Listing 1). This method also saves RAM space by requiring in most cases only two variables: the PACER_CLOCK as a free-running counter and another variable introduced at a particular instance (for...
Programmable Clock Oscillator
This is a voltage controller oscillator that was designed as a wide range oscillator to generate clock pulses for a stepper motor drive system. It does however have some interesting features. The original application used a stepper motor for its ability to operate over a very wide speed range, so this oscillator is also designed for a very wide...
Radio Clock for PC`s
The three best known of these signals are the DCF77 signal broadcast from Mainflingen near Frankfurt in Germany on 77.5kHz which can be received through out most of central and northern europe. The MSF signal broadcast from outside Rugby in England by the National Physical Laboratory at 60kHz which can be received in the anywehere in the British...
Real-time-clock chip makes low-power oscillator
Many systems use watch-crystal-based, 32.768-kHz oscillators. In battery-powered designs, the 32-kHz oscillator may consume a fairly high percentage of the total power budget. Reduced power consumption equates to longer battery life, smaller batteries, and smaller products.
System implements digital-clock modulation
The original design used a VCXO (voltage-controlled crystal oscillator) for this function, but this revised design implements an all-digital method that provided additional functions, using a midlevel CPLD from Altera (www.altera.com).
Frequency Meter Circuits
VU Meter Circuits
Low Cost Pulse Generator circuit
This pulse generator produces square pulses from 1Hz to 100KHz with adjustable pulse width of nearly 0-100%. The generator is powered with a voltage of 5-15V and is therefore suitable for both TTL and CMOS circuits. If you want to measure the response of an amplifier or give timing pulses to a variable frequency digital circuit or drive a pulse...
Key Code Combination High Security Door Lock
This project is an electronic lock with many combinations that you can easily change and opens only with the correct combination of four consecutive numbers. The big advantage of the electronic lock is that the four numbers must be entered in the correct order one after the other. If a number is wrong then the circuit automatically resets to its...
Induction Balance Gold Metal Detector Circuit
This circuit really is the simplest inducer balancing metal detector (IB, Inductlon Balance) that can be built. The LB metal detection method has a satisfactory depth of penetration and good distinction between iron-based and noble metallic objects. Several metal detectors are available in the market, but their price is often prohibitive for...
Secret High Power Free Energy Circuit (AEC)
This is a Tesla/joule thief hybrid circuit that its inventor claim to produce 90 times the input power! The circuit can be self looped and can provide 1050W of power. from the 1050W only the 11.6W will loop back to supply the joule thief. If you remove the bridge rectifier and the C capacitor you can use the circuit with high frequency AC...
High Power Full Bridge Flyback Driver circuit
You need to find a reliable full bridge driver to drive your flyback transformer? Well, This is your final stop. There are many flyback drivers schematics out there, but most of them will not last for long. It is common known that famous ZVS invented by Vladmiro Mazilli, is the most reliable flyback driver as it uses the resonant zero voltage...
High Precision Digital Pulse Meter Circuit
This small device, intended primarily for modellers, allows an instant reading of the time I of a pulse in ms. It can, for example, measure the position of the servomotors, about 1 to about 2 ms, or make repetitive or non-pulsed measurements, such as closing or opening times of any instrument, parasitic abnormality. The diagram just describes...
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