| Home | Terms of Use | Site Map | Contact Us |
IndustryCommunity.com > Electrical and Electronic Community > Analog Circuit Design Forum > Message
Main Menu
Find

[ List Subjects ][ Post Message ]
[ View Followups ][ Post Followup ]

Subject: lazy triangle

Date: 08/25/03 at 7:47 PM
Posted by: aldor
E-mail: aldor[AT55]coam.net (replace [AT55] with @ to reply)
Message Posted:

Where can I find a triangle wave generator circuit that will be stable down to .5 Hz? I have tried the 555 solution (pin 2) but adjusting the frequency distorts the waveform. I tried a intergrator on the square wave output but is is only linear at the frequency it is designed for. Varying the frequency of the square wave demands different intergrator components. I looked at the 038 waveform chip but it requires a dual supply. What I am trying to do is drive a Perkin Elmer LED/LDR package to sweep the LED current thereby sweeping the LDR to adjust the frequency up and down on a driver I designed that cannot have any external voltage on it's timing components. PWM on the LED doesn't work as the LDR passes the pulsing LED energy on to the timing circuit.

Follow Ups:


Post a Follow-up:

Name:
E-Mail:
Subject:

Message to Post:

 

1999-2001 Sunlit Technology Co., Ltd. All rights reserved.