Crystal-timebase


Posted on Aug 29, 2012

An on-board oscillator and a 17-stage divider compose IC1. By connecting a standard 3.58-MHz, television color-burst crystal as shown, an accurate source of 60-Hz squarewaves is generated at the IC`s output, pin 1. Those pulses are then fed to IC2, a 4024 seven-stage ripple counter. Its outputs are connected to different gates in IC3, which is a dual four-input NAND gate.


Crystal-timebase
Click here to download the full size of the above Circuit.

Depending on which position pulse-select switch S2 is on, one of those gates will provide an output/reset pulse of the selected width.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Speed Controler for R/C Models
Tube circuits for Guitar Amplifiers
automatic garden light controller system
16 step sequencer schematic
gmcounter
OVER LIGHT SENSOR ALARM CIRCUIT
1958 Buick Electric Wiper Conversion



Top