Posted on Oct 6, 2012

Many applications require control signals that have phase shifts with reference to an input signal. Circuit accepts a sine, square, or triangular wave as an input reference signal and produces square-wave outputs with 0`, 90`, 180`, and 270` phase shifts with respect to the input. Figure 38-3B shows the input and output waveforms. The circuit contains two !Cs: an LM565 phase-locked loop and a 7474 dual-D positive edge-triggered flip-flop. R1 and C1 set the free-running frequency of the LM565`s VCO. You should adjust R1 so that the frequency is approximately four times that of the input reference signal.

Click here to download the full size of the above Circuit.

The LM565 responds to input signals greater than 10 mV pk-pk; 3 V pk-pk is the chip"s maximum allowable input level. Q1 matches the LM565"s output to the flip-flops" inputs. The flip-flops" outputs provide the TTL-compatible square-wave signals with 0", 90", 180", and 270" phase shift with reference to the input signal.

Leave Comment

characters left:

New Circuits



Popular Circuits

Bug FM Transmitter
Video Distribution Amplifier
AD8225 High Resolution Analog/Digital Converter (ADC)Circuit and Datasheet
LED Brake/Rear Light Specifically for motorcycles Circuit diagram
motor timer
differential to ttl convertor
Cook Your Own Distortion
A Cmos Based Single Zone Alarm circuit
Leaky Transistor Buffer
Phase protective circuit of harmonic currents 2 b