Programmable Clock Oscillator

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).

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.

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...

Clock Input Frequency Divider

1. THE INPUT CLOCK frequency fed into this circuit is divided by 2n-l. The circuit consists of clocked flip-

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...

Edge detector runs off of single supply

You can use a single-supply circuit to generate a pulse on both the rising and the falling edges of a signal for use with counters or similar devices that require only a rising edge to trigger (Figure 1a). R1 and C1 form a differentiator that converts rising edges to positive spikes and falling...

Bootstrapped Timer

This circuit demonstrates how to use bootstrapping to seriously boost the output power of the timer. The LC555 can only put out about 50mA as it is. This circuit can put out at least 200mA and goes to the rail as well.

Prop Clock Project

The LED`s are rotating at 1500rpm. The motor is an VCR head from a Sharp VC651SH it`s supplied with 12V 410mA The 1288 rpm (21Hz) is just enough for a stable picture.